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• W2984249598 endingPage "14669" @default.
• W2984249598 startingPage "14659" @default.
• W2984249598 abstract "This work describes our computational study of substituent effects on the formation and cyclization of 2′-arylbenzaldehyde and 2′-arylacetophenone oxime ether radical cations. Recent experimental work by de Lijser and co-workers has demonstrated that these reactive intermediates, which are generated through photoinduced electron transfer (PET) with a photosensitizer, undergo intramolecular cyclization to yield substituted phenanthridines. The experimental study further showed correlations between the yield of cyclized products and the Hammett σPara+ parameter of the substituent on the aryl group, with both strongly electron-withdrawing and electron-donating substituents shown to significantly reduce the product yield. By analyzing the ΔGPET associated with radical cation formation as well as the thermodynamics and kinetics of radical cation cyclization, we provide an explanation for these observations. We then computationally extend this mechanistic analysis to 2′-arylbenzaldehyde oxime ethers with substituents also present on the central benzene ring and show that such substituents generally have a larger impact on the PET-induced cyclization than those on the aryl group. Overall, this work extends our understanding of the overall scope of this photooxidative route toward substituted phenanthridines as well as makes clear predictions as to how the formation of oxime ether radical cations can be tuned by substituents." @default.
• W2984249598 created "2019-11-22" @default.
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• W2984249598 date "2019-11-05" @default.
• W2984249598 modified "2023-09-24" @default.
• W2984249598 title "Computational Investigation of Substituent Effects on the Formation and Intramolecular Cyclization of 2′-Arylbenzaldehyde and 2′-Arylacetophenone Oxime Ether Radical Cations" @default.
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• W2984249598 doi "https://doi.org/10.1021/acs.joc.9b02240" @default.
• W2984249598 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31687813" @default.
• W2984249598 hasPublicationYear "2019" @default.
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