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See searches and references containing METHYLENE GROUP!METHYLENE GROUP
Chemical group (–CH2–)
A methylene group is any part of a molecule that consists of two hydrogen atoms bound to a carbon atom, which is connected to the remainder of the molecule
Methylene_group
Topics referred to by the same term
Look up methylene in Wiktionary, the free dictionary. Methylene may refer to: Methylene group or methylene bridge (CH2< or equivalently −CH2−), a part
Methylene
Any part of a molecule with the chemical formula –CH2–
in the rest of the molecule. A methylene bridge is often called a methylene group or simply methylene, as in "methylene chloride" (dichloromethane CH 2Cl
Methylene_bridge
Periodic motion of the atoms of a molecule
such as the HCH angle in a methylene group Rocking: a change in angle between a group of atoms, such as a methylene group and the rest of the molecule
Molecular_vibration
Chemical group (=CH2)
Methylene (IUPAC name: methylidene, also called carbene or methene) is an organic compound with the chemical formula CH2 (also written [CH2] and not to
Methylene_(compound)
Blue dye also used as a medication
Methylthioninium chloride, commonly called methylene blue, is a salt used as a dye and as a medication. As a medication, it is mainly used to treat methemoglobinemia
Methylene_blue
Chemical group (=CH–)
Methyl group −CH 3 Methylene group or methylidene =CH 2 Methylene bridge or methanediyl −CH 2− Methanetriyl group >CH− Methylylidyne group ≡C− "Methanylylidene
Methine_group
Forms during electrophilic substitution on benzene ring
forms methylene arenium ion 3 with (based on X-ray crystallography) positive charge located in aromatic para position and with the methylene group 6° out
Arenium_ion
Chemical group (–CH2–C6H5)
structure R−CH2−C6H5. Benzyl features a benzene ring (C6H6) attached to a methylene group (−CH2−). In IUPAC nomenclature, the prefix benzyl refers to a C6H5CH2
Benzyl_group
Chemical compound
class of antibiotics. Tyrosine, a similar amino acid, differs by a methylene group (CH2) between the aromatic ring and the alpha carbon. HPG is synthesized
4-Hydroxyphenylglycine
Chemical compound
Dichloromethane (DCM, methylene chloride, or methylene bichloride) is an organochlorine compound with the formula CH2Cl2. This colorless, volatile liquid
Dichloromethane
Index of chemical compounds with the same name
compounds consisting of a carbonyl group, an oxygen atom, a nitrogen atom with a hydrogen atom attached, and two methylene groups. The chemicals differ in the
Oxazolidinone
Chemical coupling reaction
to alkenes. Most often, the Wittig reaction is used to introduce a methylene group using methylenetriphenylphosphorane (Ph3P=CH2). Using this reagent
Wittig_reaction
Chemical group (≡CH)
Methylene group or methylidene =CH 2 Methylene bridge or methanediyl −CH 2− Methine group, methylylidene, or methanylylidene =CH− Methanetriyl group >CH−
Methylidyne_group
ethenylidenes have the connectivity =C=CH2. Vinylene group, −CH=CH− Methylene group, −CH2− Vinyl group, −CH=CH2 Barry M. Trost; Andrew McClory "Metal Vinylidenes
Vinylidene_group
Chemical compound
chemical compound with the formula C6H12O: a cycloheptane in which one methylene group is replaced by oxygen. Oxepane can be polymerized by cationic initiators
Oxepane
Chemical compound
groups are even more acidic because the carbonyl groups help stabilize the carbanion resulting from the removal of a proton from the methylene group between
Diethyl_malonate
Chemical reaction involving organic compounds
alkene carries a methylene group, elimination and addition can be concerted with transfer of an allyl proton to the carbonyl group which in effect is
Prins_reaction
Chemical reaction
The Riley oxidation is a selenium dioxide-mediated oxidation of methylene groups adjacent to carbonyls. It was first reported by Harry Lister Riley and
Riley_oxidation
Chemical compound
such as aluminium chloride: C6H5CH2Cl + C6H6 → (C6H5)2CH2 + HCl The methylene group in diphenylmethane is mildly acidic with a pKa of 32.2, and so can
Diphenylmethane
Chemical compound
four vertices are occupied by nitrogen atoms, which are linked by methylene groups. Although the molecular shape defines a cage, no void space is available
Hexamethylenetetramine
Chemical compound
reduced to 1-tetralol at −33 °C in 81% yield. The methylene group in α-position to the keto group is particularly reactive and can be converted with
1-Tetralone
Chemical compound
4-bromo-3-oxobutanoyl bromide (2) gives the amide (3). The active methylene group in that compound is then nitrosated with sodium nitrite; the initial
Cefdinir
Chemical compound
C2H2S. It can be viewed as a derivative of cyclopropene, but with the methylene group replaced by sulfur. It is antiaromatic and very labile. No thiirene
Thiirene
Chemical compound
9-Fluorenylidene is an aryl carbene derived from the bridging methylene group of fluorene. Fluorenylidene has the unusual property that the triplet ground
Fluorenylidene
Chemical compound
functional and pharmacologically active substances. It contains an acidic methylene group, flanked by both the nitrile and carbonyl, and so can be used in condensation
Ethyl_cyanoacetate
Chemical group (–CH3) derived from methane
Peligot, after determining methanol's chemical structure, introduced "methylene" from the Greek μέθυ (methy) "wine" and ὕλη (hȳlē) "wood, patch of trees"
Methyl_group
Organic chemistry effect
with guanidinium groups. These compounds are active in the cleavage of the RNA model compound HPNP. Substitution of the methylene group of the parent diphenylmethane
Thorpe–Ingold_effect
Organic polymer with the formula (C6H4CH2)n
Poly(p-phenylene methylene) is an organic polymer with the formula (C6H4CH2)n. In the simplest formulation, it consists of 1,4-phenylene rings linked by methylene groups
Poly(p-phenylene_methylene)
Group of compounds found in meat and dairy from ruminants
polyunsaturated fatty acids having non-conjugated, interrupted by at least one methylene group, carbon-carbon double bonds in the trans-configuration Talbott SM,
Conjugated_linoleic_acid
in which the amino group, NH2, is separated from the carboxyl group, COOH, by a single methylene group, CH2. When the carboxyl group is deprotonated, the
Aminopolycarboxylic_acid
Chemical compound
was determined in 1963. The double-bond isomer with an exocyclic-methylene group, β-copaene, was first reported in 1967. Chemically, the copaenes are
Copaene
Chemical compound
+ 2 Na → Ph2PNa + NaPh 2NaPPh2 + CH2Cl2 → Ph2PCH2PPh2 + 2 NaCl The methylene group (CH2) in dppm (and especially its complexes) is mildly acidic. The
Bis(diphenylphosphino)methane
Chemical compound
a tricyclic hydrocarbon core, with a hydroxy methyl group, two methyl groups and a methylene group. It constitutes the biggest part of oil of vetiver,
Khusimol
Chemical compound
first total synthesis of caffeine. The methylene group (CH2) is fairly acidic, being alpha to two carbonyl groups, and undergoes Knoevenagel condensation
1,3-Dimethylbarbituric_acid
Chemical compound
(CH2)2O2CH2. It is related to tetrahydrofuran (THF) by replacement of the methylene group (CH2) at the 3-position with an oxygen atom. The corresponding saturated
Dioxolane
Danish-American chemist
the Clemmensen reduction, a method for converting a carbonyl group into a methylene group. Erik Christian Clemmensen was born on August 12, 1876, in Odense
Erik_Christian_Clemmensen
Group of atoms giving a molecule characteristic properties
single multiple bond. For example, a methylene bridge (methanediyl) has two single bonds, whereas a methylidene group (methylidene) has one double bond.
Functional_group
Aromatic diisocyanate
Methylene diphenyl diisocyanate (MDI) is an aromatic diisocyanate. Three isomers are common, varying by the positions of the isocyanate groups around the
Methylene diphenyl diisocyanate
Methylene_diphenyl_diisocyanate
Class of oily organic compounds found in plants
characterized by the shortening of a chain or ring by the removal of a methylene group or substitution of one or more methyl side chains by hydrogen atoms
Terpene
Chemical compound
are well developed. Most are prepared by condensation of the active methylene group with carbonyls. 2-Aminofluorene, 3,6-bis(dimethylamino)fluorene, and
Fluorene
Cyclic compound (C2H4O)
alkoxides, reactions of ethylene oxide with compounds containing active methylene group leads to the formation of butyrolactones: Ethylene oxide enters into
Ethylene_oxide
Visual representation of allowable protein conformations
methylene group at Cβ. Glycine has only a hydrogen atom for its side chain, with a much smaller van der Waals radius than the CH3, CH2, or CH group that
Ramachandran_plot
Atom set which has replaced hydrogen atoms on a hydrocarbon's parent chain
(called moieties). It can be traced back to the old name of methanol, "methylene" (from Ancient Greek: μέθυ méthu, 'wine' and ὕλη húlē, 'wood', 'forest')
Substituent
Chemical compound
cycloalkane with the molecular formula (CH2)3, consisting of three methylene groups (CH2) linked to each other to form a triangular ring. The small size
Cyclopropane
Reduction method involving hydrazine
functionalities into methylene groups. In the context of complex molecule synthesis, it is most frequently employed to remove a carbonyl group after it has served
Wolff–Kishner_reduction
Type of chemical reaction
reaction to convert aldehydes and ketones to olefins with a terminal methylene group. This reaction was discovered by the German chemist Thomas Kauffmann
Kauffmann_olefination
Chemical compound
desaurins is planar. With unsymmetrical substitution (at the ends of the methylene groups), they can exist as separable cis and trans isomers. Yates, Peter;
Desaurin
Chemical compound
The molecule consists of a five-membered saturated ring with four methylene groups and a sulfur atom. It is the saturated analog of thiophene and is therefore
Tetrahydrothiophene
Spin states of hydrogen
Avshalom C. (2006). "Ortho–para spin isomers of the protons in the methylene group". Chirality. 18 (9): 754–756. doi:10.1002/chir.20319. PMID 16856167
Spin_isomers_of_hydrogen
Class of perfluorinated chemical compounds
any chemical with at least a perfluorinated methyl group (−CF3) or a perfluorinated methylene group (−CF2−) is a PFAS." The United States Environmental
PFAS
Carboxylic acid
acids is usually associated with the carboxylic acid or the adjacent methylene group. By conversion to their acid chlorides, they can be converted to the
Fatty_acid
Classification of agents that are possibly carcinogenic to humans
2-Methylaziridine (Propyleneimine) Methylazoxymethanol acetate 5-Methylchrysene 4,4'-Methylene bis(2-methylaniline) 4,4'-Methylenedianiline Methyleugenol 2-Methylimidazole
IARC_group_2B
Nelson Shoolery, is a good approximation of the chemical shift δ of methylene groups in proton nuclear magnetic resonance. We can calculate shift of the
Shoolery's_rule
Chemical compound
participates in condensation reactions by virtue of the weakly acidic methylene group. Methyl propionate, a similar compound "Material Safety Data Sheet :
Ethyl_propionate
Chemical compound
characterized by an epoxide on the cycloheptane as well as an exocyclic methylene group that is conjugated with the carbonyl of the lactone. Arglabin is extracted
Arglabin
Protein family
create larger molecules. The elongase extends the molecule by two methylene groups (-CH2-CH2-) while the desaturase forms double bonds. Δ-desaturases
Fatty_acid_desaturase
Chemical compound
nonproteinogenic alpha-amino acid. It is structurally equivalent to a one-methylene group-higher homolog of arginine and to the guanidino derivative of lysine
Homoarginine
Process to transform the material properties of natural rubber
rubber (EPDM rubber). All of these materials contain alkene groups adjacent to methylene groups. Other specialty rubbers may also be vulcanized, such as
Sulfur_vulcanization
Chemical reaction
haloketone with diazomethane. It is an insertion reaction in that the methylene group from the diazomethane is inserted into the carbon-chlorine bond of
Nierenstein_reaction
Chemical compound
unsaturated hydrocarbon, containing a cyclohexane ring with a methylene (methylidine) group attached. Methylcyclohexane Methylenecyclopropane Wittig, George;
Methylenecyclohexane
Chemical compound
3-Disubstituted Isoindolines. Isoindene with nitrogen replaced by a methylene group. International Union of Pure and Applied Chemistry (2014). Nomenclature
Isoindole
Class of corticosteroids
methylene group instead of a methyl group at the C16 position while fluocinolone and triamcinolone are corticosteroids which feature a hydroxyl group
Methasone
Opioid medication used for pain relief
aluminium tert-butoxide (Oppenauer oxidation). The 6 ketone group may be replaced with a methylene group via the Wittig reaction to produce 6-methylenedihydrodesoxymorphine
Hydromorphone
How drugs induce reversible suppression of consciousness
bilayer/buffer partition coefficient K is linear, with the addition of each methylene group causing a change in the Gibbs free energy of -3.63 kJ/mol. The cutoff
Theories of general anaesthetic action
Theories_of_general_anaesthetic_action
Molecular-structure relationship
called a geminal coupling. It occurs only when two hydrogen atoms on a methylene group differ stereochemically from each other. The geminal coupling constant
Geminal
Molecule containing two adjacent C=O groups
aromatic derivative is phthalaldehyde. Diketones with two methylene groups separating the carbonyl groups, also called γ-diketones, typically coexist with their
Dicarbonyl
Model of phase equilibrium in statistical thermodynamics
frequently set to 10. It is based on the coordination number of an methylene group in a long chain, which has in the approximation of a hexagonal close
UNIQUAC
Example of the methylene shuffle: LSD and MiPLA LSD MiPLA The methylene shuffle is a strategy in medicinal chemistry used to modify the hydrophobicity
Methylene_shuffle
Protecting group used in organic synthesis
"Palladium-Catalyzed Cyclization-Heck Reaction of Allenamides: An Approach to 3-Methylene-5-phenyl-1,2,3,4-tetrahydropyridine Derivatives". Org. Lett. 19 (1): 86–89
Tert-Butyloxycarbonyl protecting group
Tert-Butyloxycarbonyl_protecting_group
Chemical compound
Substances Control Act (TSCA)" along with four other toxic chemicals. Methylene diphenyl diisocyanate Toluene diisocyanate NIOSH Pocket Guide to Chemical
4,4'-Methylenebis(2-chloroaniline)
4,4'-Methylenebis(2-chloroaniline)
Organic compound
the oxygen atom on carbonyl groups with a methylene group. Compared with the Wittig reagent, it has more functional group tolerance. An important ylide
Ylide
Probable carcinogens
j]acridine Dibenz[a,h]anthracene Dibenzo[a,l]pyrene Dichloromethane (methylene chloride) 4,4'-Dichlorodiphenyltrichloroethane (DDT) Diethyl sulfate Dieldrin
IARC_group_2A
Chemical compound
be prepared from bromoform. Methylene group Methylene bridge Methine group (methylylidene group, =CH-) Methylidyne group (≡CH) Henri A. Favre; Warren
Methylidyne_radical
Class of chemical compounds
double bonds. Uniquely for biolipids, alkenones have a spacing of five methylene groups between double bonds, which are of the less common E configuration
Alkenone
Working fluid in a refrigeration cycle
fluorine atoms (X4 = 4), with fluorine on the central carbon (y) and a methylene group (f), which consists of a carbon atom double-bonded to another carbon
Refrigerant
Heterocyclic aromatic organic compound
bromomethyl ketones gives the related pyridinium salt, wherein the methylene group is highly acidic. This species undergoes a Michael-like addition to
Pyridine
Chemical compound
thirteen carbon atoms, and is derived from an isoprenoid by the loss of methylene groups. In wines, TDN is generally considered to contribute to a desirable
1,1,6-Trimethyl-1,2-dihydronaphthalene
1,1,6-Trimethyl-1,2-dihydronaphthalene
Chemical reaction
organic azide, usually tosylazide, and an activated methylene (i.e. a methylene with two withdrawing groups) react in the presence of a base to give an α-diazo-1
Wolff_rearrangement
Rearrangement in organic chemistry
hydroxyl group generates an alkoxide. The alkoxide then displaces a methylene group from the nearby silicon atom; and a free proton quenches the methylene carbanion
Brook_rearrangement
Chemical compound
misnomer, given than nor- is defined for an amino acid with one less methylene group than found in the proteinogenic form. Sicherheitsdatenblatt Acros.[permanent
Norleucine
Naturally occurring chemical compound from the group of fatty acids
cyclopropane fatty acid synthase, a methylene group is added to the double bond of cis-vaccenic acid. The methylene group originates from S-adenosylmethionine
Lactobacillic_acid
Enzyme
the C-6 of FdUMP. This forms of a nucleophilic C-5 which attacks the methylene group of the tetrahydrofolate. In normal dUMP processing, an active site
Thymidylate_synthase
protected, the methylene group required for the oxetane ring D was then provided by the Corey-Chaykovsky reagent, which converted the carbonyl group to an epoxide
Danishefsky Taxol total synthesis
Danishefsky_Taxol_total_synthesis
Regulations covering trans fat in food products
polyunsaturated fatty acids having non-conjugated [interrupted by at least one methylene group (−CH2−)] carbon-carbon double bonds in the trans configuration. This
Trans_fat_regulation
Chemical group (–CH2–CH=CH2)
an allyl group is a substituent with the structural formula −CH2−HC=CH2. It consists of a methylene bridge (−CH2−) attached to a vinyl group (−CH=CH2)
Allyl_group
Chemical compound
carbonyl group, which is further away from the methylene group (3-position). Nucleophiles such as thiols can easily be added to the methylene group. With
Itaconic_anhydride
Chemical group (–CH2–CH3)
employed, such as ethyl halides. In unsymmetrical ethylated compounds, the methylene protons in the ethyl substituent are diastereotopic. Chiral reagents are
Ethyl_group
Biochemical process in which fatty acids are derived from acetyl-CoA and NADPH
separated by a methylene group (–CH2–). However, several PUFAs contain double bonds that are not always interrupted by a methylene group, and thus the
Fatty_acid_synthesis
Class of chemical compounds
composed of substituted benzotriazoles with a phenyl group in the 2-position, which carries a hydroxy group in the ortho-position. 2-(2-hydroxyphenyl)-2H-benzotriazoles
2-(2-Hydroxyphenyl)-2H-benzotriazoles
2-(2-Hydroxyphenyl)-2H-benzotriazoles
Chemical reaction in which one entity is inserted between bonded parts of another
2-rearrangement. Consequently, the methylene group α- to the carboxyl group in the product is the methylene group from the diazomethane reagent. The 1
Insertion_reaction
Study of chemical compounds containing carbon-selenium bonds
useful in organic oxidation. Specifically, SeO2 will convert an allylic methylene group into the corresponding alcohol. A number of other reagents bring about
Organoselenium_chemistry
Class of chemical compounds
referred to as carbanucleosides) are nucleoside analogues in which a methylene group has replaced the oxygen atom of the furanose ring. These analogues
Carbocyclic_nucleoside
Amino acids not naturally encoded in the genome
toxin from jengkol beans, is composed of two cysteines connected by a methylene group. Diaminopimelic acid is both used as a bridge in peptidoglycan and
Non-proteinogenic_amino_acids
Organic ring compound (C4H4NH)
with an activated methylene compound. The method involves the reaction of an α-aminoketone (1) and a compound containing a methylene group α to (bonded to
Pyrrole
Chemical reaction
Carroll, M. F. "131. Addition of α,β-unsaturated alcohols to the active methylene group. Part I. The action of ethyl acetoacetate on linalool and geraniol"
Carroll_rearrangement
Pharmaceutical compound
OCLC 10324237. Lengthening of the side chain of DMT by a single methylene group produces N,N-dimethylhomotryptamine (DMHT; 76, R = H, n = 3). which
Dimethylhomotryptamine
Vitamin
metabolism is transporting single-carbon groups (i.e., a methyl group, methylene group, or formyl group). These carbon groups can be transferred to other molecules
Folate
Chemical compound
is used to replace oxygen centres in aldehydes and ketones with a methylene group, i.e., a methylenation: R2CO + Ph3PCH2 → R2C=CH2 + Ph3PO The phosphorus-containing
Methylenetriphenylphosphorane
Chemical compound
resistant bacteria strains. Ampicillin and sulbactam are linked via a methylene group, forming two ester bonds (or more accurately acylal bonds). Sultamicillin
Sultamicillin
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METHYLENE GROUP
METHYLENE GROUP
METHYLENE GROUP
METHYLENE GROUP
METHYLENE GROUP
METHYLENE GROUP
METHYLENE GROUP
METHYLENE GROUP
METHYLENE GROUP
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