54109-03-4, Name is 5-Chloroisobenzofuran-1(3H)-one, belongs to benzofurans compound, is a common compound. SDS of cas: 54109-03-4In an article, once mentioned the new application about 54109-03-4.
A palladium-catalyzed pyrazole-directed regioselective oxidative C(sp2)-H functionalization of the N-phenyl ring in N-phenylpyrazoles to afford either a biaryl bis-pyrazole (via dehydrogenative homocoupling) or N-(o-hydroxyphenyl)pyrazole (via C-H oxygenation) or their mixture is described. The substitutions on the N-phenyl ring and the pyrazole ring and the dilution of the reaction medium with respect to the TFA/TFAA mixture (substrate concentration) have a remarkable influence on the outcome of the reaction. It was discovered that if the reactions were performed under highly dilute conditions (ca. 10 times) then N-(o-hydroxyphenyl)pyrazoles were the major or the sole products.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2611O – PubChem