Abstract
AbstractThe carbon T1 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 T1 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 T1 value observed for the terminal methyl carbon.
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