Abstract
In the reaction of o-chlorosulfonyl isocyanate with imidazole, pyrazoles, and pyrazolines with a free NH group of the nucleus under mild conditions, N-acylation takes place with the formation of a heterocyclic containing, at the nitrogen atom of the nucleus, an o-Cl-C6H4SO2NHCO- group which hydrolyzes very easily in the case of pyrzoles.
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