Abstract
Sodium alkoxides readily add to the exocyclic double bond of variously substituted 4-benzylidene derivatives of 1,2-diphenyl-3,5-dioxopyrazolidine to give the sodium salts of 4-(1-alkoxybenzyl)-1, 2-diphenyl-3,5-dioxopyrazolidines, the methylation of which leads to 4-methyl-4-(1-alkoxy-benzyl)-1, 2-diphenyl-3,5-dioxopyrazolidines. This confirms the previously expressed assumption that the reason for the stability of the N-N bond and the exocyclic double bond of 4-benzylidene-1,2-diphenyl-3,5-dioxopyrazolidine in alkaline media with respect to catalytic hydrogenolysis is the formation under these conditions of a stable enolate.
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B. L. Moldaver, M. P. Papirnik, V. V. Zverev, and Yu. P. Kitaev, Khim. Geterotsikl. Soedin., 781 (1973).
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See [1] for communication XX.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 224–226, February, 1974.
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Moldaver, B.L., Aronzon, M.E. Research on the chemistry of pyrazolidine. Chem Heterocycl Compd 10, 197–199 (1974). https://doi.org/10.1007/BF00487782
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DOI: https://doi.org/10.1007/BF00487782