J. R. Beck, R. Gajewski, M. P. Lynch
1987
Citations
0
Influential Citations
27
Citations
Journal
Journal of Heterocyclic Chemistry
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.