AI Article Synopsis
- The study reexamines the hydrogen atom transfer (HAT) reactions between certain benzophenones and 2-propanol, focusing on the production of stable chemical products.
- The primary products of these reactions are diphenyl and dimethyl ketyl radicals, which subsequently lead to various stable photoproducts through radical coupling processes.
- The researchers utilized liquid chromatography and high-resolution mass spectrometry to analyze and identify the structures of these photoproducts, while discussing the unclear mechanisms behind the reactions.
Article Abstract
The hydrogen atom transfer reaction (HAT) between selected benzophenones (benzophenone BP, 3-carboxybenzophenone 3CB, and 4-carboxybenzophenone 4CB) and 2-propanol was reinvestigated focusing on stable product analysis. As expected, the primary species of these HAT's are the respective diphenyl and dimethyl ketyl radicals that eventually undergo several radical coupling reactions leading to stable photoproducts. However, the mechanisms of these free radical reactions remain unclear and open to question. In this report, we focus on the detailed analysis of the stable photoproducts of these reactions using liquid chromatography coupled with high-resolution mass spectrometry (LC-ESI-QTOF-MS/MS). Products of photopinacolization (benzpinacol and two diastereoisomers of 4CB and 3CB dimers) and isomeric radical cross-coupling adducts of respective diphenyl and dimethyl ketyl radicals were separated chromatographically, and their structures were determined by high-resolution MS/MS, and the mechanisms of the reactions are discussed.
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| http://dx.doi.org/10.1016/j.jphotobiol.2022.112536 | DOI Listing |
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