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Geminal carbon-proton spin-spin coupling constants in ethyl, isopropyl and tert-butyl compounds

✍ Scribed by Tom Spoormaker; Marius J. A. de Bie

Book ID
104588236
Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
364 KB
Volume
99
Category
Article
ISSN
0165-0513

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✦ Synopsis

Abstract

The geminal ^13^C^1^H coupling constants in ethyl, isopropyl and tert‐butyl compounds having elements of the first row of the Periodic Table and halogens as substituents are determined by single resonance ^13^C FT NMR spectroscopy. In addition, the values of directly bonded ^13^C^13^C coupling constants are given. The substituent electronegativity dependence of the geminal ^13^C^1^H coupling constant is discussed. It is concluded that the influence exerted by a β‐methyl substituent on the geminal ^13^C^1^H coupling constant of 13C^α^‐C^β^‐^1^H fragments is not constant and hence no simple additivity relation can be established for this coupling constant.

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