Journal of the Chemical Society. Chemical communications p. 721 - 722 (1993)
Update date:2022-08-17
Topics:
Armesto, Diego
Horspool, William M.
Mancheno, Maria J.
Ortiz, Maria J.
While some hydrazine derivatives 3 of 2,2-dimethyl-4,4-diphenylbut-3-enal undergo both the aza-di-?-methane (ADPM) rearrangement and a novel cyclization to afford dihydropyrazole derivatives 5 in varying yields, the tosylhydrazone derivative of 3,3-dimethyl-5,5-diphenylpent-4-en-2-one 7 gives exclusively an excellent yield of the corresponding dihydropyrazole 8, in a reaction that is proposed to involve an electron transfer process.
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