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The hexamethylene diamine molecule contains six methylene groups. 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 by two single bonds. [1]
[15] [16] The term "methyl" was derived in about 1840 by back-formation from "methylene", and was then applied to describe "methyl alcohol" (which since 1892 is called "methanol"). Methyl is the IUPAC nomenclature of organic chemistry term for an alkane (or alkyl) molecule, using the prefix "meth-" to indicate the presence of a single carbon.
The blue part of this diagram of a propene molecule is a methylidene group.. A methylidene group is any part of a molecule that consists of a CH 2 = group. [7] The group may be represented as =CH 2, where the '=' denotes the double bond.
Methylene is the simplest carbene.. In organic chemistry, a carbene is a molecule containing a neutral carbon atom with a valence of two and two unshared valence electrons.The general formula is R−:C−R' or R=C: where the R represents substituents or hydrogen atoms.
The methylene bridge (methanediyl group) In organic chemistry, a methylene bridge, methylene spacer, or methanediyl group is any part of a molecule with formula −CH 2 −; namely, a carbon atom bound to two hydrogen atoms and connected by single bonds to two other distinct atoms in the rest of the molecule.
Structure of the allyl group. In organic chemistry, an allyl group is a substituent with the structural formula −CH 2 −HC=CH 2.It consists of a methylene bridge (−CH 2 −) attached to a vinyl group (−CH=CH 2).
Benzyl group and derivatives: Benzyl group, benzyl radical, benzyl amine, benzyl bromide, benzyl chloroformate, and benzyl methyl ether. R = heteroatom, alkyl, aryl, allyl etc. or other substituents. In organic chemistry, benzyl is the substituent or molecular fragment possessing the structure R−CH 2 −C 6 H 5.
The C-H stretching mode gives a strong absorptions between 2850 and 2960 cm −1 and weaker bands for the C-C stretching mode absorbs between 800 and 1300 cm −1. The carbon–hydrogen bending modes depend on the nature of the group: methyl groups show bands at 1450 cm −1 and 1375 cm −1 , while methylene groups show bands at 1465 cm −1 ...