A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Recommanded Product: 2,2′-(Methylazanediyl)diacetic acid, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 4408-64-4, Name is 2,2′-(Methylazanediyl)diacetic acid, molecular formula is C5H9NO4. In a Article, authors is Castro-Godoy, Willber D.，once mentioned of 4408-64-4
Hydroxylation of arylboronic acids and arylboronic esters using sodium sulfite and oxygen as the source of ultimate oxidant proceeds rapidly in water under transition metal-free conditions. This remarkable mild and environmentally benign protocol represents a green alternative to synthesize phenols using inexpensive starting materials in a simple methodology. This new application for sodium sulfite shows a wide tolerance of functional groups, and it is compatible with oxidizable functionalities.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI