Issue 6, 1988

Electron spin resonance studies on the photodissociation of 2,4,6-trimethylbenzoyldiphenylphosphine oxide

Abstract

Upon irradiation of 2,4,6-trimethylbenzoyldiphenylphosphine oxide (TMDPO) with u.v. light in O2-free benzene solution a doublet indicative of phosphorus-centred radicals was observed. By this technique α-scission of TMDPO yielding the diphenylphosphinoyl radical (Ph2[double bond, length as m-dash]O) was directly evidenced. This radical was found to add to the carbonyl groups of intact TMDPO with k= 1.6 ± 107M–1s–1 forming a radical of the general structure A[Ph2P(O)]ĊOP(O)Ph2(A: 2,4,6-trimethylbenzoyl). In the time-resolved measurements CIDEP due to the radical-pair mechanism was observed.

Article information

Article type
Paper

J. Chem. Soc., Perkin Trans. 2, 1988, 961-965

Electron spin resonance studies on the photodissociation of 2,4,6-trimethylbenzoyldiphenylphosphine oxide

M. Kamachi, K. Kuwata, T. Sumiyoshi and W. Schnabel, J. Chem. Soc., Perkin Trans. 2, 1988, 961 DOI: 10.1039/P29880000961

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