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Free Radical Formation from Excited States of Aliphatic Carboxylic Acids and esters in solution as studied by electron spin resonance
Author(s) -
Kaiser Tony,
Grossi Loris,
Fischer Hanns
Publication year - 1978
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19780610119
Subject(s) - chemistry , radical , electron paramagnetic resonance , photochemistry , aqueous solution , excited state , solvent , halogenation , carboxylic acid , spectroscopy , alkyl , organic chemistry , physics , nuclear magnetic resonance , quantum mechanics , nuclear physics
Abstract During UV.‐irradiation of aliphatic carboxylic acids and esters in aqueous and nonaqueous solutions various alkyl and acyl type radicals derived from parent compounds and solvents have been observed by ESR.‐spectroscopy. The structures of the radicals point to α‐cleavage, β‐dehalogenation and photoreduction as major photolytic processes of carboxylic acids and esters. The relative contributions of these processes to the overall photodecompositions depend on the carboxyl substituents, on solvent and temperature. Similarities of carboxyl and carbonyl group photochemistry are discussed.