The Journal of Organic Chemistry

Thermolysis of dimethyl 3, 3-(2, 2'-biphenylyl)-3H-pyrazole-4, 5-dicarboxylate

S Mataka, M Tashiro

Index: Mataka, Shuntaro; Tashiro, Masashi Journal of Organic Chemistry, 1981 , vol. 46, # 9 p. 1929 - 1931

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Citation Number: 11

Abstract

The photolysis of 3H-pyrazoles is a well-known preparative method for cyc1opropenes. l Although some examples of thermal elimination of nitrogen affording cyclopropenes have been reported, 2 the Van Alphen-Huttel rearrangement3v4 is usually the predominant reaction pathway, giving 4H-and/or 1H-pyrazoles according to Scheme I.