A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Name: 2,6-Di-tert-butyl-4-methylphenol, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 128-37-0, Name is 2,6-Di-tert-butyl-4-methylphenol, molecular formula is C15H24O. In an article, author is Takeda, Takuya,once mentioned of 128-37-0.
A new approach for the synthesis of highly functionalized tetrahydrocyclohepta[b]indoles through [5 + 2] cycloaddition was developed. Two carbon carbon bonds were formed by the simple addition of an indium catalyst, which acted as both a pi-Lewis acid and sigma-Lewis acid to activate the alkyne and unsaturated ester, respectively. The reaction could be applied to various substrates and proceeded regio- and diastereoselectively in all cases.
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Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles