Abstract
Abstract5‐Amino‐3‐methylthio‐1H‐pyrazoles are very important building blocks from which a wide variety of pyrazole derivatives can be prepared. When substituted 5‐amino‐3‐methylthio‐1H‐pyrazole was treated with CH3I, the methylation occurres at endocyclic two nitrogens at the same time. The ratio of isomers in products was depended upon the nature of 4‐position substituent in the pyrazole ring. The products were characterized by X‐ray diffraction analysis, and the ratios of isomer were explained by means of the results of ab inito calculation.
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