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Use of a relationship betweenJ(13CH) and τ to evaluate anisotropic contributions to τ-anisotropies in the τ-values of the group IV tetramethyl derivatives

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
3
Issue
1
Identifiers
DOI: 10.1016/s0022-328x(00)82736-9
Disciplines
  • Chemistry

Abstract

Abstract A linear relationship is reported between 13CH spin-spin coupling constants, J( 13CH), and proton chemical shifts, τ, for a restricted series of methyl derivatives. The existence of this relationship is rationalized and the relationship is employed: ( a) to justify an earlier interpretation of the chemical shift data for the tetramethyl derivatives of the group IV elements; (b) to conclude that the chemical shift data cannot be employed to evaluate electronegativities of the central group IV element in these compounds; (c) to aid in evaluating the anisotropic contributions to the chemical shifts of the methyl halides and other compounds. The 13CH spin-spin coupling constants indicate that the hybridization of the methyl carbon atom in the tetramethyl derivatives of the group IV elements changes with the effectiveness of central element-carbon overlap.

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