A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 80-07-9, Name is 4,4′-Sulfonylbis(chlorobenzene), molecular formula is C12H8Cl2O2S. In an article, author is Dawsey, Anna C.,once mentioned of 80-07-9, Product Details of 80-07-9.
Preparation of 2H-spirol[Benzo[d]isothiazole-3,3 ‘-pyrazole]-1,1-dioxide-2 ‘(4 ‘ H)-carboxylates from Dilithiated C(alpha),N-Carboalkoxyhydrazones and Methyl 2-(Aminosulfonyl)benzoate
A variety of substituted spiro(benzoisothiazole-pyrazoles) have been prepared by the condensation of dilithiated C(alpha),N-carboalkoxyhydrazones with lithiated methyl 2-(aminosulfonyl)benzoate followed by the cyclization of intermediates with acetic anhydride, which also resulted in spiro N-acetylated products when carbomethoxyhydrazones or carboethoxyhydrazones were used, and spiro, NH products when carbo-tert-butoxyhydrazones were used.
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Reference:
Isothiazole – Wikipedia,
,Isothiazole – ScienceDirect.com