Synthesis of the first examples of 1-benzophosphepines

Abstract
Flash vacuum pyrolysis of 2a,7b-dihydro-3-phenyl-3H-cyclobut[b]phosphindole 3-oxide 4, prepared from 1-phenyl-1H-phosphindole 1-oxide 1via three steps, results in ring-opening to give 1-phenyl-1-benzophosphepine 1-oxide 5, which, on treatment with trichlorosilane, undergoes deoxygenation to afford 1-phenyl-1-benzophosphepine 6.

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