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. 6118-51-0, Name is exo-3,6-Epoxy-1,2,3,6-tetrahydrophthalic Anhydride, molecular formula is C8H6O4. In an article, author is Farhat, Mahmoud F.,once mentioned of 6118-51-0, Computed Properties of C8H6O4.
Synthesis of Some Pyrazole Derivatives from 5-Chloro- and 5-Azido-1,3-diphenyl-1H-pyrazole-4-carbaldehydes
N-[(5-Azido-1,3-diphenyl-1H-pyrazole-4-yl)methylene]-N-arylamines (4a-c) and N-[(5-Substituted-1,3-diphenyl-1H-pyrazole-4-yl)methylene]hydrazides (5a-e) were prepared from 5-azido-1,3-diphenyl-1H-pyrazole-4-carbaldehyde (3) and 5-chloro-1,3-diphenyl-1H-pyrazole-4-carbaldehyde (2), respectively. Thermolysis of (4a-c) and (5d-e) afforded 5-arylamino-1,3-diphenyl-1H-pyrazol-4-carbonitriles (8a-c) and N-(4-cyano-1,3-diphenyl-1H-pyrazol-5-yl)hydrazides (13a,b), respectively. N-[2-(5-Chloro-1,3-diphenyl-1H-pyrazol-4-yl)-4-oxo-thiazolidin-3-yl]amides (14a,b) and 3-acetyl-2-(5-chloro-1,3-diphenyl-1H-pyrazol-4-yl)-5-aryl-2,3-dihydro-1,3,4-oxadiazoles (15a,b) were obtained from N-[(5-chloro-1,3-diphenyl-1H-pyrazole-4-yl)methylene]hydrazides (5a,b). 5-Azido-1,3-diphenyl-1H-pyrazol-4-carbaldehyde (3) gave unexpectedly 1-(1,3-diphenyl-1,6-dihydropyrrolo-2,3-c]pyrazol-5-yl)ethan-1-one (17).
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Reference:
Thiazolidine – Wikipedia,
,Thiazolidine – ScienceDirect.com