Synthesis and chemistry of 10,11-dihydro-5-phenyl-5H-dibenzo[b,[hair space][hair space]f[hair space][hair space]]phosphepine 5-oxide,† the 5-propyl analogue and related phosphonium salts

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Stuart Warren and Paul Wyatt


Abstract

The preparation of the title compounds is greatly improved by combining seven steps (three lithiations, three substitutions and an oxidation) into a one-pot procedure. The hydrolysis of the related phosphonium salts, the lithiation of the P-propyl phosphepine oxides and their reaction with electrophiles are described.


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