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13C nuclear magnetic resonance of organophosphorus compounds XII—phospholes and dibenzophospholes

✍ Scribed by George A. Gray; John H. Nelson

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
571 KB
Volume
14
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Natural abundance ^13^C NMR studies have been carried out on a series of phospholes and dibenzophospholes. The systems were analyzed with respect to ring conformation and substituent orientation. Assignments of all chemical shifts have been made by investigating partially relaxed inversion‐recovery spectra and by investigating the field dependence of the spectra. A nonplanar (6‐membered central ring) tricyclic phosphine was also examined. Here, the value of the two bond coupling constant ^2^J(PC) allowed determination of the orientation (axial) of the phosphorus‐substituted phenyl ring. Conclusions regarding cyclic conjugation in phospholes are presented.

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