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The Dechlorination of Polychlorinated Biphenyls by UV-irradiation. IX. Reactions of Monochlorobiphenyls in a 2-Propanol Solution

Authors :
Kinji Anda
Tohru Nishiwaki
Tsutomu Shinoda
Mitsuhiko Hida
Source :
Bulletin of the Chemical Society of Japan. 55:3569-3572
Publication Year :
1982
Publisher :
The Chemical Society of Japan, 1982.

Abstract

The multiplicity of the photo-excited state responsible for the dechlorination reaction of monochlorobiphenyls was determined in 2-propanol. Linear Stern-Volmer plots were obtained by the use of 1,3-cyclohexadiene for the dechlorination reactions of 2- and 3-chlorobiphenyl; the slopes were 35.7 and 11.0 dm3 mol−1 respectively. Fluorescence emissions were also quenched, and the quenching constants for 2- and 3-chlorobiphenyls were in accord with the respective values of the slope obtained from the Stern-Volmer plot for the reaction. The reaction of 4-chlorobiphenyl was quenched by cis-1,3-pentadiene, but was accelerated by 1,3-cyclohexadiene. Photosensitized dechlorinations of monochlorobiphenyls took place with several ketones, such as acetone and acetophenonc. These sensitized reactions were, however, very inefficient compared with the reactions in the direct excitations, except in the case of 4-chlorobiphenyl. It was, then, concluded that the dechlorinations of 2- and 3-chlorobiphenyl occurred only from...

Details

ISSN :
13480634 and 00092673
Volume :
55
Database :
OpenAIRE
Journal :
Bulletin of the Chemical Society of Japan
Accession number :
edsair.doi...........e38e8a0d90fc291a07da59a1030025a1
Full Text :
https://doi.org/10.1246/bcsj.55.3569