Table of Contents
Laser Chemistry
Volume 15 (1994), Issue 1, Pages 55-59

Pulsed-Laser Induced Chain Addition Reaction of Butanal to Diethyl Maleate

1Laboratoire d'Optique Atomique et Moléculaire, France
2Laboratoire de Chimie des Arômes, Faculté des Sciences, U.N.S.A. -06108 NICE, Cedex 2, France

Received 1 October 1993

Copyright © 1994 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


By irradiation of a 5/1 mixture of butanal and diethyl maleate with a pulsed Nd-YAG laser (10 Hz, 13 ns), frequency tripled (λ = 355 nm), diethyl butanoyl succinate is formed by addition. The quantum yield is greater than 1 which means that a chain mechanism occurs which was not the case in previous studies with a mercury lamp. The quantum yield is a function of light intensity and can reach 280 in the range explored (I = 3020 to I = 0.303 The excited aldehyde produces the two radicals nPr-ĊHOH and nPr—ĊO. The nucleophilic acyl radical reacts on the diethyl maleate to form an intermediary radical which givs the adduct and a new acyl radical in the presence of an aldehyde molecule. The second radical nPr—ĊHOH captures a hydrogen from the aldehyde producing another acyl radical and butanol.