Helvetica Chimica Acta p. 1039 - 1051 (1992)
Update date:2022-07-30
Topics:
Neidlein, Richard
Schroeder, Guenter
Krieger, Claus
Kikelj, Danijel
The readily available bis(alkoxycarbonyl)ketene ethylene acetals 1 react with bifunctional nucleophiles to give heterocycles 2-5 (Scheme 1).Their reactions with N,N-dialkylhydrazines lead to the pyrazolium betaines 7a-f (Scheme 4).Cyclic N,N-dialkylhydraz
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