I found the field of Chemistry very interesting. Saw the article Visible light driven, nickel-catalyzed aryl esterification using a triplet photosensitiser thioxanthen-9-one published in 2019. Safety of 3-Methylbenzoic acid, Reprint Addresses Li, HX; Lang, JP (corresponding author), Soochow Univ, Coll Chem Chem Engn & Mat Sci, Suzhou 215123, Peoples R China.. The CAS is 99-04-7. Through research, I have a further understanding and discovery of 3-Methylbenzoic acid
We report an approach to the visible light-initiated, nickel-catalyzed esterification of carboxylic acids with aryl bromides. Thioxanthen-9-one works as a triplet photosensitizer to significantly accelerate this cross-coupling to provide aryl esters in moderate to excellent yields at room temperature. A mechanistic investigation indicates that this esterification undergoes the stepwise oxidative addition of an arylbromide to nickel, transmetalation of an aryl-Ni(ii) bromide complex, energy transfer from thioxanthen-9-one to an excited-state aryl-Ni(ii) carboxylate and reductive elimination to the aryl ester. This study contributes to the utilization of ketones as triplet photosensitisers in photochemical transformations.
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Reference:
Isothiazole – Wikipedia,
,Isothiazole – ScienceDirect.com