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Spirobutyrolactone derived from 1-phenyl-3-methyl-2-pyrazolin-5-one

✍ Scribed by A. B. Zolotoi; Yu. I. Él'natanov; I. I. Chervin; S. V. Konovalikhin; O. A. D'yachenko; L. O. Atovmyan; R. G. Kostyanovskii

Publisher
Springer US
Year
1988
Tongue
English
Weight
334 KB
Volume
24
Category
Article
ISSN
0009-3122

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## Abstract The reaction of some active methylene compounds with 4‐(dicyanomethylene)‐3‐methyl‐1‐phenyl‐2‐pyrazoline‐5‐one (1a) has been investigated. This reaction involves a Michael addition to afford 4‐spirocyclobutenes 3 or cyclopyran‐2‐pyrazoline‐5‐ones 4, depending on the active methylene der