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Hypothesis in physical organic chemistry
Hammond's postulate (or alternatively the Hammond–Leffler postulate), is a hypothesis in physical organic chemistry which describes the geometric structure
Hammond's_postulate
American chemist (1921–2005)
George Simms Hammond (May 22, 1921 – October 5, 2005) was an American scientist and theoretical chemist who developed "Hammond's postulate", and fathered
George_S._Hammond
Topics referred to by the same term
as Hammond or Hammond's Landing Upper Hammonds Plains, Nova Scotia Hammond Street, a settlement in Broxbourne borough, Hertfordshire Stoke Hammond, a
Hammond
Principle in physical chemistry
same for all reactions belonging to a particular reaction family. Hammond's postulate Free-energy relationship Brønsted catalysis equation Catalytic resonance
Bell–Evans–Polanyi_principle
from electrophilic attack at the ortho/para or meta positions. The Hammond postulate then dictates that the relative transition state energies will reflect
Electrophilic aromatic directing groups
Electrophilic_aromatic_directing_groups
code, Hamming distance, Hamming weight – Richard Hamming Hammond postulate – George Simms Hammond Hanle effect – Wilhelm Hanle Hardy notation, space – Godfrey
Scientific phenomena named after people
Scientific_phenomena_named_after_people
Chemical reaction
pedagogical demonstration of the reactivity–selectivity principle and the Hammond postulate. A bromine radical is not very reactive and the transition state for
Free-radical_halogenation
reaction Halohydrin formation reaction Hammick reaction Hammond principle or Hammond postulate Hantzsch pyrrole synthesis Hantzsch dihydropyridine synthesis
List_of_organic_reactions
either directly by calculations on transition states, or based on Hammond's postulate, by modeling the steric and electronic demands of the reactants.
Spartan_(chemistry_software)
Illyrian king from 393 BC to 358 BC
Prespa Lakes, the "Dassaretis" of later topography, not "Dardania", as Hammond postulated" Vujčić 2021, pp. 501–504. Howe 2017, pp. 99, 108. Woodward 1993,
Bardylis
Explanation for the rates of electron transfer reactions
of the condensed system, provides the actual reaction coordinate. Hammond's postulate Solvated electron Free-energy relationship Contrary to Marcus' approach
Marcus_theory
Private liberal arts college in Lewiston, Maine, U.S.
1943 alumnus George Hammond who was later dubbed "the father of the movement". Hammond would go on to invent Hammond's postulate, revolutionizing activation
Bates_College
photographic sensitization compounds George S. Hammond (1921–2005), American chemist, famous for Hammond's postulate as part of the general theory of the transition
List_of_chemists
Representation of a chemical process as a single energetic pathway
nuclei actually occur through a series of simple chemical reactions. Hammond postulate is another tool which assists in drawing the energy of a transition
Energy_profile_(chemistry)
Change in chemical reaction rate due to isotopic substitution
developed by Westheimer predicts that symmetrical (thermoneutral, by Hammond's postulate), linear transition states have the largest isotope effects approaching
Kinetic_isotope_effect
Configuration of a chemical reaction when potential energy is greatest
is further described in the article geometry optimization. The Hammond–Leffler postulate states that the structure of the transition state more closely
Transition_state
Obsolete concept in chemistry
selectivity in chemical reactions can successfully be explained by Hammond's postulate. When reactivity-selectivity relationships do exist they signify
Reactivity–selectivity principle
Reactivity–selectivity_principle
and the other which is mostly-folded. Phi value analysis assumes Hammond's postulate, which states that energy and chemical structure are correlated.
Phi_value_analysis
Discipline of organic chemistry
equilibration.[page needed] Mathematically derived formalisms such as the Hammond Postulate, the Curtin-Hammett principle, and the theory of microscopic reversibility
Physical_organic_chemistry
original on September 13, 2016. Retrieved August 29, 2016. "George S. Hammond". web.pdx.edu. Archived from the original on June 25, 2016. Retrieved August
List_of_Bates_College_people
Method for representing chemical reactions data
accordance with the Hammond postulate, the transition state moves along the diagonal towards the corner that is raised in energy (a Hammond effect) and perpendicular
More_O'Ferrall–Jencks_plot
Illyrian people
Prespa Lakes, the "Dassaretis" of later topography, not "Dardania", as Hammond postulated" Vujčić 2021, pp. 501–504. Cabanes 2002, p. 56. Cabanes 2002, pp. 50–51
Dassaretii
structure to perturbations, such as change of reaction solvent. Hammond–Leffler postulate Jencks, WP (1985). "A Primer for the Bema Hapothle. An Empirical
Bema_Hapothle
Ancient state in West Asia
enough, the inscription differentiates eastern regions that many would postulate as having been under Median authority based on classical sources. Parthia
Median_kingdom
Vesicles found outside cells
exosomes and ectosomes. Numerous functions of EVs have been established or postulated. The first evidence for the existence of EVs was enabled by the ultracentrifuge
Extracellular_vesicle
Flat-topped underwater mountain
"guyots", after the Department of Geosciences building at Princeton. Hess postulated they were once volcanic islands that were beheaded by wave action, yet
Guyot
Law of nature relevant to chemistry
corresponds to the structure at the top of the energy barrier. The Hammond–Leffler postulate states that this state looks most similar to the product or starting
Chemical_law
Race held in 2009
Class A4. The race was specifically given a 1949 theme, with the BBC postulating that the race might represent what Top Gear would have been like in 1949
Top_Gear_Race_to_the_North
Statement based on repeated empirical observations that describes some natural phenomenon
corresponds to the structure at the top of the energy barrier. The Hammond–Leffler postulate states that this structure looks most similar to the product or
Scientific_law
Tabular arrangement of the chemical elements
the chemical periodicity is repeated. In a 1919 paper, Irving Langmuir postulated the existence of "cells" which we now call orbitals, which could each
Periodic_table
1997 monster horror film by Peter Hyams
human hypothalami, until it runs out of targets and dies; he further postulates that the tribe knew of the fungus, and used it on a human or animal to
The_Relic
Information systems theory
the Davis work. They were critical of the measurement model used, and postulated a different model based on three constructs: usefulness, effectiveness
Technology_acceptance_model
Army of the First Philippine Republic (1899–1901)
and personally paid for the new uniforms. At least one researcher has postulated that Juan Luna may have patterned the tunic after the English Norfolk
Philippine_Revolutionary_Army
One kind of insect metamorphosis
eclosion theory with a focus on endocrine control of metamorphosis. They postulated that hemimetabolan species hatch after three embryonic "moults" into a
Holometabolism
Roman consul in 155 BC, pontifex maximus and princeps senatus
brother-in-law (he had married another daughter of Scipio Africanus). Scullard postulates that Gracchus had some interests in Corsica and Sardinia, and wanted to
Publius Cornelius Scipio Nasica Corculum
Publius_Cornelius_Scipio_Nasica_Corculum
Observed discrepancy in galactic angular momenta
in a galaxy. Theories involving unobservable dark matter are the main postulated explanation of this discrepancy. Considering their mass distributions
Galaxy_rotation_curve
Canadian historian (1917–2016)
exchange among civilizations is what drives human history forward, first postulated in The Rise of the West (1963). He was the Robert A. Millikan Distinguished
William_H._McNeill
State office in the early Turkic states, roughly equivalent to viceroy
whether it indicated an ally or subject of a Chinese empire; Another theory postulates a Sogdian origin for both titles, "yabghu" and "shad". The rulers of some
Yabghu
Experience interpreted within a religious framework
natural mysticism. Walter Terence Stace criticised Zaehner, instead postulating two types following Otto, namely extraverted (unity in diversity) and
Mystical or religious experience
Mystical_or_religious_experience
Branch of science about the natural world and its life forms.
variety of far reaching deductions drawn from a small number of primary postulates — they are mechanics, electrodynamics, and thermodynamics. Today, natural
Natural_science
School of Islamic jurisprudence
Istishab was first introduced by the later Shafiʽi scholars. Al-Shafiʽi also postulated that "penal sanctions lapse in cases where repentance precedes punishment"
Shafi'i_school
Fictional character from Doctor Who
dubious personality traits were made evident; both Davies and Clarke postulated that the character "deserved to lose his girlfriend". Though Clarke felt
Mickey_Smith
Bacterial disease
January 2026. Hammonds, Evelynn Maxine. Childhood's Deadly Scourge: The Campaign to Control Diphtheria in New York City, 1880–1930 (1999) Hammonds, Evelynn
Diphtheria
exists in general relativity? In loop quantum gravity, the spacetime is postulated to be discrete from the beginning. In string theory, although originally
List of unsolved problems in physics
List_of_unsolved_problems_in_physics
Maoist political conception of democracy
Democracy. Marx himself is often misunderstood on this topic as he did not postulate that strictly only after a bourgeois society has formed, a socialist revolution
New_Democracy
Science fiction thriller by Alfonso Cuarón
strategy of existential resilience; that, across cultures, individuals must postulate meaning, beyond material existence, wherever none can be perceived. Some
Gravity_(2013_film)
1993 American comedy film by Harold Ramis
time loop on the planet Punxsutawnee. Writing for IGN, Michael Swaim postulated that since Groundhog Day popularized the time loop narrative, it had increased
Groundhog_Day_(film)
Old Stone Age ''Homo sapiens''
terms of two competing models during the 1980s: "recent African origin" postulated the emergence of H. sapiens from a single source population in Africa
Early_modern_human
American geophysicist (1935–2023)
on the further development of the plume theory of Tuzo Wilson, which postulates the existence of roughly cylindrical convective upwellings in the Earth's
W._Jason_Morgan
Music genre that uses electronic instruments
computer-assisted composition using algorithmic composition. "... Hiller postulated that a computer could be taught the rules of a particular style and then
Electronic_music
Collection of fragments written by Blaise Pascal
times scholars have noted parallels between Heidegger and Pensées, while postulating various instances of influence. Phenomenological value theorists, particularly
Pensées
American economist (born 1940)
be explained by decreased incentives for work and production. Laffer's postulate was that the tax rate that maximizes revenue was at a much lower level
Arthur_Laffer
Grouping of people
their history, Slavs came into contact with non-Slavic groups. In the postulated homeland region (present-day Ukraine), they had contacts with the Iranian
Slavs
Ancient Mesopotamian city in Iraq
be understood as a place name. Archibald Sayce, writing in the 1870s, postulated that the Semitic name was a loan-translation of the original Sumerian
Babylon
States were investment banks, rather than commercial banks. Jonathan Knee postulates that Jews were forced to focus on the development of investment banks
History of investment banking in the United States
History_of_investment_banking_in_the_United_States
Concept in physics
metric-skew-tensor-gravity (MSTG), in which a skew symmetric tensor field postulated as part of the gravitational action. A newer version of MSTG, in which
Nonsymmetric gravitational theory
Nonsymmetric_gravitational_theory
8th-Century BCE Assyrian king, Neo-Assyrian Empire
Ashur-nirari V, who was either his brother or his father. Other historians postulate that the evidence could just as easily be interpreted as Tiglath-Pileser
Tiglath-Pileser_III
Geologic feature in Washington and Oregon, United States
only 28°), it seems it will not entirely go away. How this affects the postulated rifting does not seem to have been addressed. A more recent work based
Olympic–Wallowa_lineament
Historic house in Massachusetts, United States
He has acquired also the Sagamore Hill farm." Although local rumors postulate that Mrs. Crane’s displeasure with the villa led to its eventual destruction
Castle Hill (Ipswich, Massachusetts)
Castle_Hill_(Ipswich,_Massachusetts)
Geological process at mid-ocean ridges
theories by Alfred Wegener and Alexander du Toit of continental drift postulated that continents in motion "plowed" through the fixed and immovable seafloor
Seafloor_spreading
Political ideology combining nationalism with communism
Rodinson wrote: "Classical Marxism, for once faithful to Marx himself, postulates that a socialist state cannot be imperialist. But no proof is provided
National_communism
Theoretical concept and policy movement
Ashford argues that the concept of inclusive capitalism is rooted in the postulates of the binary economics. C. K. Prahalad opens his 2005 book The Fortune
Inclusive_capitalism
Tolkien. King Sheave, a poem describing the arrival of Sheave (Sceaf), a postulated Germanic culture hero, in 154 lines. It was originally an incomplete portion
List of Tolkien's alliterative verse
List_of_Tolkien's_alliterative_verse
Quantum mechanical waves describing matter
is symbolized by f as is done in the rest of this article. Einstein's postulate was verified experimentally by K. T. Compton and O. W. Richardson and
Matter_wave
American astrologer (1895–1985)
designating an agreeable agent to produce the astrological effects. Rudhyar postulated that the stars did not cause the effects seen in human life but were pictures
Dane_Rudhyar
Logical operation
Press. p. 45. Sheffer, Henry Maurice (1913). "A set of five independent postulates for Boolean algebras, with application to logical constants". Transactions
Sheffer_stroke
French anthropologist and philosopher (1923–2015)
it possible to reach still higher stages of human development. You can postulate as many such stages as are needed. Thus, you can have a transition between
René_Girard
2009 American-Canadian science fiction TV series
naquadria deposits throughout the core. The team, led by Dr. Nicholas Rush, postulate that the power from that core could allow them to use a 9-chevron address
Stargate_Universe
American Lithuanian economist (born 1946)
why Eugene Fama's Efficient Market Hypothesis (EMH) was fallacious. EMH postulates that the present value of an asset reflects the efficient incorporation
Robert_J._Shiller
Plant immune response to infection
response occurs came from Harold Henry Flor's gene-for-gene model. He postulated that for every resistance (R) gene encoded by the plant, there is a corresponding
Hypersensitive_response
Islamic philosopher and poet (1877–1938)
only officially embraced the goal of Pakistan in 1940. Some historians postulate that Jinnah always remained hopeful for an agreement with the Congress
Muhammad_Iqbal
Type of endocrine gland cancer
Ellison, who gave their names to Zollinger–Ellison syndrome, after postulating the existence of a gastrin-secreting pancreatic tumor in a report of
Pancreatic_cancer
American logician (1937–2021)
Gottlob Frege, Charles Sanders Peirce, Clarence Irving Lewis, the American Postulate Theorists, Alfred Tarski, Willard Van Orman Quine, and Warren Goldfarb
John_Corcoran_(logician)
Book by Herbert Simon
situations, this adaptiveness falls far short of the ideal 'maximizing' postulated in economic theory. Evidently, organisms adapt well enough to 'satisfice';
Administrative_Behavior
German philosopher (1844–1900)
meningioma as an explanation of Nietzsche's dementia; Orth and Trimble postulated frontotemporal dementia while other researchers have proposed a hereditary
Friedrich_Nietzsche
American economist and Nobel Laureate (1915–2009)
consumer's utility function, by observing their behavior. Rather than postulate a utility function or a preference ordering, Samuelson imposed conditions
Paul_Samuelson
The Middle Bronze Age Migrations are postulated waves of migration during the Middle Bronze Age. This proposal was advanced in the mid-20th century by
Middle Bronze Age migrations (ancient Near East)
Middle_Bronze_Age_migrations_(ancient_Near_East)
Elementary particle or quantum of light
emitted must equal the rate at which they are absorbed. Einstein began by postulating simple proportionality relations for the different reaction rates involved
Photon
1918–1920 global influenza pandemic
poultry was regularly brought in to feed the camp. Oxford and his team postulated that a precursor virus, harbored in birds, mutated and then migrated to
Spanish_flu
British South Africa Company unit attacked in 1893 in Rhodesia
"This is the end" said one. British soldier and historian Roger Marston postulates that the patrol might still have been safe had it not now pursued the
Shangani_Patrol
Economic model of price determination in a market
and demand is an economic model of price determination in a market. It postulates that, holding all else equal, the unit price for a particular good or
Supply_and_demand
Substitution reaction with a carbocation intermediate
stabilization and hyperconjugation from attached alkyl groups. The Hammond–Leffler postulate suggests that this, too, will increase the rate of carbocation
SN1_reaction
French writer (1901–1990)
Jouffroy quotes Leiris (from Fibrilles) that "the practice of poetry [...] postulates the other as one's equal" and (from L’Âge d’homme) that poetic inspiration
Michel_Leiris
Temple in Jerusalem in Abrahamic religions
hands. Quranic commentators such as Muhammad al-Tahir ibn Ashur have postulated that this verse refers specifically to the Temple of Solomon. According
Solomon's_Temple
1982 Oliver Hazard Perry-class frigate
evaluation, rapid decision-making and almost instantaneous response to any postulated threat. The systems aboard Thach were designed to meet these demanding
USS_Thach
language seems to be Turkic; but Mongolic, Yeniseian, Uralic etc., are also postulated. After 370 under a certain Balamber they founded an empire in the East
List_of_ancient_great_powers
Social institution of ancient Greece
attracted to emulate Spartan practices in the 7th century, when pederasty is postulated to have first been formalized in Dorian cities. One of the first cities
Pederasty_in_ancient_Greece
Historical development of physics
measurements. What remains absolute is stated in Einstein's relativity postulate: "The basic laws of physics are identical for two observers who have a
History_of_physics
Folds of throat tissues that help to create n through vocalization
Antoine Ferrein in 1741. In his violin analogy of the human voice, he postulated that the moving air acted like a bow on cordes vocales. The alternative
Vocal_cords
Indo-European language
Puhvel Publisher University of California Press, 1966 p.102 Orel 2000 postulates a Vulgar Latin intermediary for no good reason. Mallory & Adams (1997)
Albanian_language
Proto-Indo-European Sun and Moon deities
Proto-Indo-European culture. The existence of a Proto-Indo-European sun deity can be postulated on the basis of its possible reflexes throughout Indo-European cultures
*Seh₂ul_and_*Meh₁not
Mental disorder
men, and another meta analysis reporting no association. It has been postulated by evolutionary psychologists that moderate versions of compulsive behavior
Obsessive–compulsive_disorder
1983 aircraft shotdown over the Sea of Japan
remained in HEADING hold instead of INS mode after departing Anchorage. They postulated that this inflight navigational error was caused by either the crew's
Korean_Air_Lines_Flight_007
English philosopher and physician (1632–1704)
later philosophers, such as Rousseau, David Hume, and Immanuel Kant. He postulated that, at birth, the mind is a blank slate, or tabula rasa. Contrary to
John_Locke
American economist (born 1953)
Reserve System on February 20, 2004, Bernanke gave a speech in which he postulated that we are in a new era called the Great Moderation, where modern macroeconomic
Ben_Bernanke
Hypothetical climatic effect of nuclear war
authentic sophistication was achieved in newer and more elegant models, the postulated effects headed downhill. By 1986, these worst-case effects had melted
Nuclear_winter
Season of American television series
d'Abo as Nicole Wallace Wayne Duvall as Unit Counselor Kurt Plumm Darrell Hammond as Leonard Timmons Neil Patrick Harris as John Tagman Mara Hobel as April
Law & Order: Criminal Intent season 4
Law_&_Order:_Criminal_Intent_season_4
2022 business acquisition
social media bias". Robby Soave of American libertarian magazine Reason postulated that Musk's purchase would not threaten Twitter or democracy, suggesting
Acquisition of Twitter by Elon Musk
Acquisition_of_Twitter_by_Elon_Musk
Pre-Columbian Mayan city in Belize
Pre-Columbian or the 3,000 years old as postulated by F.A. Mitchell-Hedges. Additionally, many archaeologists postulate that most, if not all, of the skulls
Lubaantun
Differential transmission of genes residing in the same genome
of other genes that reside in the same genome. The selfish gene theory postulates that natural selection will increase the frequency of those genes whose
Intragenomic_conflict
HAMMONDS POSTULATE
HAMMONDS POSTULATE
Surname or Lastname
English (Midlands)
English (Midlands) : patronymic form of Hammond.
Surname or Lastname
English
English : variant of Sammons.
Surname or Lastname
English (West Midlands)
English (West Midlands) : patronymic from Salmon 1.
Surname or Lastname
English (Devon)
English (Devon) : from a pet form of the Norman personal name Hamo (see Hammond 1).
Girl/Female
Biblical
Heat, the sun.
Surname or Lastname
English
English : variant of Hammond.
Male
English
English surname transferred to forename use, derived from Norman French Hamon, HAMMOND means "home."Â
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : from a personal name, Hamo(n), which is generally from a continental Germanic name Haimo, a short form of various compound names beginning with haim ‘home’, although it could also be from the Old Norse personal name Hámundr, composed of the elements hár ‘high’ + mund ‘protection’. As an Irish name it is generally an importation from England, but has also been used to represent Hamill 3 and, more rarely, McCammon.
Surname or Lastname
English
English : patronymic from the Norman personal name Hamo (see Hammond).
Boy/Male
Arabic
Thankful; Grateful
Boy/Male
British, Christian, English, French, German
House; Introduced from Germany During the Norman Conquest; From the Little Home
Surname or Lastname
English
English : variant spelling of Symonds.
Surname or Lastname
English
English : patronymic form of Hammond.
Surname or Lastname
English
English : patronymic from Hamon.
Boy/Male
English German
House or home. Introduced from Germany during the Norman Conquest. Also used as a surname.
Surname or Lastname
English (Midlands and Wales)
English (Midlands and Wales) : apparently a variant of Hammonds.
Biblical
heat; the sun
Surname or Lastname
English
English : apparently a variant of Hammonds.
Surname or Lastname
English
English : variant of Gammon.
Surname or Lastname
English, French, and Dutch
English, French, and Dutch : from the Norman personal name Hamo(n) (see Hammond, Hammen).
HAMMONDS POSTULATE
HAMMONDS POSTULATE
Boy/Male
Hindu, Indian, Sanskrit
Full of Mercy; Kind
Girl/Female
Tamil
Vinodhini | விநோதிநீ
Happy girl
Girl/Female
Hindu
Name of a flower
Boy/Male
Gaelic Irish American Scottish
From the knolls.
Boy/Male
Hindu, Indian
The Heart of God
Girl/Female
Hindu, Indian, Tamil
Possessing Good Character
Boy/Male
Hebrew
Whom God helps. The name Azalrah was given to several Old Testament characters, including a king...
Male
Norwegian
Norwegian variant form of Scandinavian Balder, BALDOR means "lord, prince."
Boy/Male
Arabic, Muslim, Pashtun
Piercing Lines; Fighter
Boy/Male
American, Australian, British, English, Greek
Nobel Wolf; Manly
HAMMONDS POSTULATE
HAMMONDS POSTULATE
HAMMONDS POSTULATE
HAMMONDS POSTULATE
HAMMONDS POSTULATE
n.
A variety of vegetable casein, resembling legumin, and found in almonds, rye, wheat, etc.
n. pl.
Small lines used to sling hammocks under the deck beams.
n.
An emulsion made by bruising seeds; as, the milk of almonds, produced by pounding almonds with sugar and water.
n.
A characteristic crystalline substance, obtained from oil of bitter almonds.
n.
The white milky pulp or extract of bitter almonds.
a.
Pertaining to, resembling, or made of, almonds.
n.
A kind of sweet bread or biscuit; a cake of pounded almonds and sugar.
n.
A ferment resembling diastase, found in bitter almonds. Cf. Amygdalin, and Emulsin.
n.
A glucoside extracted from bitter almonds as a white, crystalline substance.
n.
A kind of cold cream prepared from almonds, for chapped hands, etc.
n.
A species of pastry, containing cream and almonds.
a.
Of, pertaining to, or resembling, almonds.
pl.
of Cornu Ammonis
n.
The vegetable casein of almonds.
n.
A cake, sweetmeat, or confection made with almonds or other nuts.
n.
A small cake, composed chiefly of the white of eggs, almonds, and sugar.
n.
A rope on which hammocks or clothes are hung for drying.
a.
Of or pertaining to almonds; derived from amygdalin; as, amygdalic acid.
n.
An emulsion made of almonds; milk of almonds.