methylene group

Related to methylene group: methylene radical

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Noun

methylene group - the bivalent radical CH2 derived from methane

chemical group, radical, group - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule

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References in periodicals archive ?

These were assigned to the bridging methylene (I-CH2-I) and methylene group and hydrogen bonded terminal methylol functions (I-CH2-OH), respectively.

Synthesis, Characterization, Antimicrobial Activity and Theoretical Studies of New Polymeric Schiff-base

This region covers C-H stretching vibrations of phenyl ring and methylene group along with N-H as well as C=O stretching modes of amide group.

Uniform versus nonuniform scaling of normal modes predicted by Ab Initio calculations: a test on 2-(2,6-dichlorophenyl)-n-(1,3-thiazol-2yl) acetamide

UIs formula is based on the principle that methene functional group is always next to allylic methylene group in monounsaturated fatty acids and with both allylic and diallylic methylene groups in Poly Unsaturated Fatty Acids (PUFAs).

Long-term risperidone treatment induces visceral adiposity associated with hepatic steatosis in mice: a magnetic resonance approach

It is simply a condensation reaction between an aldehyde or a ketone and a compound containing an active methylene group. It is promoted by various catalysts to generate chemical compounds which are used in pharmaceutical and food industries [4,5].

Amines and amino acids as catalysts in Knoevenagel condensation reaction of benzaldehyde with malononitrile

A wellknown catalysis mechanism includes the formation of a quinone methide intermediate and subsequent Michael type addition with the formation of a methylene group between aromatic rings [3].

Structure and curing mechanism of resol phenol-formaldehyde prepolymer resins/ Resoolsete fenoolformaldehuudvaikude analuus

Homocysteine is similar to the amino acid cysteine but differs in that it has one additional methylene group.

Hyperhomocysteinemia as a result of the methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism causes an increased risk of cerebrovascular disease: a biochemical perspective

While some authors believe that initial hydrogen abstraction can occur randomly, i.e., from any -CH2-group, it is more generally believed that abstraction occurs preferentially at the N-vicinal methylene group, i.e., that which is immediately adjacent to the -NH- group.

Nylon degradation: problems and opportunities: it is probably not an exaggeration to say that the development and commercialisation of linear, thermoplastic polyamides were due in large part to the farsightedness of one company and the brilliance of one man

* Epoxy, urethane, aminoplast, unsaturated polyester, alkyd, silane/silicone, hybrid systems, active methylene group, etc.

FSCT Midyear Symposium features workshop on crosslinking for coatings

Disappearance of peak after polymerization at 1650 [cm.sup.-1] which corresponds to terminal methylene group of the monomer clearly indicated the complete polymerization of vinyl group.

Preparation, characterisation and fabrication of intraocular lens from photo initiated polymerised poly (methyl methacrylate)

The determination of the methylene group distribution between chains and cycles in amorphous solids is a complicated problem and needs further research, especially the dipolar-dephasing behavior of the kerogen in the [sup.13]C NMR MAS experiment.

Current knowledge on the origin and structure of Estonian kukersite kerogen

A preferred adhesive has a first component comprising a PRF resin mixed with a methylene group donor hardener such as paraformaldehyde.