Nonaqueous diazotization of 5??amino??1??aryl??1H??pyrazole??4??carboxylate esters

…, RP Gajewski, MP Lynch, FL Wright

Index: Beck, James R.; Gajewski, Robert P.; Lynch, Michael P.; Wright, Fred L. Journal of Heterocyclic Chemistry, 1987 , vol. 24, p. 267 - 270

Full Text: HTML

Citation Number: 29

Abstract

Abstract 5-Amino-1-aryl-1H-pyrazole-4-carboxylate esters are converted to the corresponding desamino, chloro, bromo, iodo, and methylthio esters by processes involving nonaqueous diazotization. Diazotizing agents are alkyl nitrites except in the case of chlorine where nitrosyl chloride is used. Evidence is presented that the latter reagent leads to the formation of cationic rather than radical intermediates.