Photochemistry of Substituted Benzoylformate Esters. A Convenient Method for the Photochemical Oxidation of Alcohols
摘要:
The production of aldehydes and ketones via photochemical hydrogen atom transfer in substituted benzoylformate esters of primary and secondary alcohols has been investigated. Substituent effect studies have shown that (2,4-dimethoxybenzoyl)formate (DMBF) esters give superior performance. A divergence in the byproducts derived from the ester group (the benzaldehyde (and presumably CO) or the benzoic acid (and presumably CO2)) is observed depending on the presence of oxygen. A mechanistic rationale for the formation of the benzoic acid has been advanced based on the known trapping of intermediate 1,4-biradicals by oxygen followed by fragmentation.
Photochemistry of Substituted Benzoylformate Esters. A Convenient Method for the Photochemical Oxidation of Alcohols
摘要:
The production of aldehydes and ketones via photochemical hydrogen atom transfer in substituted benzoylformate esters of primary and secondary alcohols has been investigated. Substituent effect studies have shown that (2,4-dimethoxybenzoyl)formate (DMBF) esters give superior performance. A divergence in the byproducts derived from the ester group (the benzaldehyde (and presumably CO) or the benzoic acid (and presumably CO2)) is observed depending on the presence of oxygen. A mechanistic rationale for the formation of the benzoic acid has been advanced based on the known trapping of intermediate 1,4-biradicals by oxygen followed by fragmentation.