Cyclisation Reaction of Dibenzoylmethanemono-- (tosylhydrazone) with Butyllithium and Lead tetraacetate.

Abstract

Dibenzoylmethanemono(tosylhydrazone) undergoes cyclisation reaction with butyllithium and lead tetraacetate to afford 3,5-diphenylpyrazole in good yield in both cases. Mechanistic schemes have been postulated to account for these reactions.