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Spectral analysis of the high-resolution proton-coupled carbon-13 NMR spectra of 1,3,2-dithiarsolanes

✍ Scribed by D. W. Aksnes; T. A. Holak

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
395 KB
Volume
18
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The high‐resolution proton‐coupled ^13^C NMR spectra of 2‐chloro‐ and 2‐phenyl‐4‐methyl‐1,3,2‐dithiarsolane and 2‐chloro‐ and 2‐phenyl‐1,3,2‐dithiarsolane have been obtained and completely analysed. The spectral analysis has provided all the ^13^C chemical shifts and ^13^C^1^H coupling constants, including their relative signs. The results of this work are adequately interpreted in terms of two rapidly equilibrating half‐chair conformers with the 4‐methyl pseudo‐axial or pseudo‐equatorial. The cis isomers appear to be conformationally biased towards the form with the 4‐methyl pseudo‐equatorial. The two one‐bond ^13^C^1^H coupling constants of the methylene group are distinctly different. For both the cis and trans isomers, the largest one‐bond coupling always involves the methylene proton situated syn to the substituent at arsenic. The observed variation in the geminal and vicinal ^13^C^1^H coupling constants are discussed in terms of a stereospecific inductive effect of the sulphur hetero‐atoms and conformational factors.

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