Table of Contents
Laser Chemistry
Volume 10, Issue 5-6, Pages 267-275

Benzylchlorocarbene: UV Absorption Spectrum, Kinetics for 1,2-H Migration and Mechanism for Reaction With Acetic Acid as Determined by Combined Continuous and Laser-Flash Photolysis

1UA 348 du CNRS, Laboratoire de Chimie Physique A, Université de Bordeaux I, Talence 33405, France
2Department of Chemistry, University of Prince Edward Island, P.E.I., Charlottetown CIA 4P3, Canada
3Department of Chemistry, University of Southampton, S09 5NH, UK

Received 15 September 1989; Accepted 15 November 1989

Copyright © 1990 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.


The UV absorption spectrum of benzylchlorocarbene, generated by laser flash photolysis of 3-chloro-3- benzyldiazirine, has been observed in the 290-330 nm range. The lifetime of this species, 18 ns at 25°C, is determined by the rate of the 1,2-H migration to produce chlorostyrenes. Quenching rate constants of this carbene by acetic acid and tetramethylethylene have been measured. Comparison of this kinetic data with the quantitative analysis of the products obtained under continuous irradiation gives further insight into the mechanisms of carbene-acetic acid reactions.