Premium
Norrish Type I Cleavage of Aliphatic Carboxylic Acids and Esters in Solution. A CIDNP.‐study
Author(s) -
Kaiser Tony,
Fischer Hanns
Publication year - 1979
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.19790620512
Subject(s) - chemistry , pivalic acid , cidnp , isobutyric acid , photochemistry , excited state , singlet state , molecule , scavenger , cationic polymerization , bond cleavage , organic chemistry , radical , catalysis , physics , nuclear physics
UV.‐irradiation of pivalic and isobutyric acid and their methyl esters as well as of α‐hydroxy isobutyric and malonic acid in solution lead to chemically induced dynamic nuclear polarization (CIDNP.) of parent compounds and of various reaction products. CIDNP.‐effects and product distributions confirm α‐cleavage of the C(α), CO bond to be the major mode of photodecomposition. Scavenger experiments indicate that decomposition of the molecules from a triplet excited state is roughly equally or more probable than from a singlet excited state. Quantum yields of educt disappearance are also given for the methyl esters of pivalic and isobutyric acid.