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Communication | Regular issue | Vol 6, No. 11, 1977, pp.1865-1869
Published online, 1st January, 1970
DOI: 10.3987/R-1977-11-1865
Preparation of 3,4,5-Trisubstituted Pyrazoles from 2,2-Dioxoketene-S,S-acetals

Edward C. Taylor* and W. Ronald Purdum

*Department of Chemistry, Princeton University , Princeton, New Jersey 08544, U.S.A.


2,2-Dioxoketene-S,S-acetals (5 - 7) react with hydrazine to give 5-methylthiopyrazoles (8 - 10) rather than diazafulvenes (A). Nucleophilic displacement of the 5-methylthio (or the derived 5-methylsulfonyl) substituent in these pyrazoles was not possible.