A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Category: thiazolidines, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 99-86-5, Name is 1-Isopropyl-4-methylcyclohexa-1,3-diene, molecular formula is C10H16. In an article, author is Chaban, T. I.,once mentioned of 99-86-5.
Synthesis of 2H-Thiopirano[3,4-c]pyrazol-7-one Derivatives as the First Example a New Heterocyclic System
A series of ethyl 4-[(Z)-(4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)methyl]-1-aryl-1H-pyrazole-3-carboxylates was obtained as a result of the reaction of ethyl 4-formyl-1-aryl-1H-pyrazole-3-carboxylates with rhodanine. Under the action of NaOH, the prepared pyrazole-3-carboxylates underwent recyclization to form 2-aryl-7-oxo-2,7-dihydrothiopyrano[3,4-c]pyrazole-5-carboxylic acids-the first representatives of new heterocyclic system.
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Reference:
Thiazolidine – Wikipedia,
,Thiazolidine – ScienceDirect.com