SCHEDULED MAINTENANCE
5-Substituted dibenzophospholes (I; R = Ph, Me, Et, or Pri), on treatment with benzoyl chloride in the presence of triethylamine, followed by hydrolysis, undergo ring expansion to form 5,6-dihydrodibenzo[b,d]phosphorin 5-oxides (XI; R = Ph, Me, Et, or Pri) in high yield. 5-t-Butyldibenzophosphole (I; R = But) did not form an acylphosphonium salt on treatment with benzoyl chloride.
D. W. Allen and A. C. Oades, J. Chem. Soc., Perkin Trans. 1, 1976, 2050 DOI: 10.1039/P19760002050
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