Bromination of 1, 3-and 1, 5-dimethyl-1 H-pyrazole-4-carbaldehydes

…, GA Akopyan, KS Badalyan, GG Minasyan…

Index: Attaryan; Akopyan; Badalyan; Minasyan; Asratyan Russian Journal of Organic Chemistry, 2007 , vol. 43, # 11 p. 1740 - 1741

Full Text: HTML

Citation Number: 1

Abstract

With a view to obtain 5-bromo-1, 3-dimethyl-1H-pyrazole and 3-bromo-1, 5-dimethyl-1H- pyrazole we tried to perform bromination of 1, 3-dimethyl-1H-pyrazole-4-carbaldehyde (I) and 1, 5-dimethyl-1H-pyrazole-4-carbaldehyde (II) with subsequent oxidation and decarboxylation. Surprisingly, instead of the expected products III and IV, the bromination of formylpyrazoles I and II gave 4-bromo-1, 3-dimethyl-1H-pyrazole (V) and 4-bromo-1, 5- ...