Intramolecular interactions and spin–lattice relaxation times of methyl groups | Zendy

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Intramolecular interactions and spin–lattice relaxation times of methyl groups

Author(s) -

Ng Soon

Publication year - 1983

Publication title -

organic magnetic resonance

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.483

H-Index - 72

eISSN - 1097-458X

pISSN - 0030-4921

DOI - 10.1002/omr.1270210113

Subject(s) - steric effects , intramolecular force , methyl group , chemistry , carbon atom , alkyl , crystallography , hydrogen bond , hydrogen , carbon fibers , relaxation (psychology) , stereochemistry , photochemistry , molecule , materials science , organic chemistry , psychology , social psychology , composite number , composite material

The carbon T 1 values of the alkyl substituents of various compounds have been measured. The salient observation is that the terminal methyl carbon of the n ‐propyl or a three‐carbon chain bonded to an electronegative atom X(or an electron‐donating group) has a reduced T 1 value. A net attractive interaction between the methyl hydrogen atoms and X in the gauche conformation is invoked to account for the observed result. In chains longer than three carbons that are not firmly anchored at one end, the γ steric interaction is suggested to be the main steric interaction that causes the reduced T 1 value observed for the terminal methyl carbon.

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