Natural abundance 13C 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 2J(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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Gray et al. (1980) studied this question.
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