Chemical Research Letters, May 2021. In heterogeneous catalysis, catalysts provide a surface to which reactants bind in a process of adsorption. 636-61-3, Name is (R)-2-Hydroxysuccinic acid, molecular formula is C4H6O5, Quality Control of (R)-2-Hydroxysuccinic acid, belongs to benzisoxazole compound, is a common compound. In a patnet, author is Nimnual, Phongprapan, once mentioned the new application about 636-61-3.
The utility of the nitrogen extrusion reaction of azido complexes, generated in situ from the corresponding aldehydes or ketones with TMSN3 in the presence of ZrCl4 or TfOH, has been described. These azido complexes could undergo three different pathways, depending on the substrates. First, azido methanolate complexes or imine diazonium ions could lead to benzisoxazole products via an intramolecular nucleophilic substitution. Second, imine diazonium ions could also undergo either the elimination of proton to provide nitrile products in good to excellent yields or an aryl migration, followed by an intramolecular nucleophilic addition, to give benzoxazole products in good yields.
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Reference:
Benzisoxazole – Wikipedia,
,Benzisoxazole – an overview | ScienceDirect Topics