Accession Number : AD0707027

Title :   KINETICS OF THE CYCLOADDITION OF PHOTOEXCITED BENZENE TO 2-BUTENE IN THE GAS PHASE,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF CHEMISTRY

Personal Author(s) : Morikawa,A. ; Brownstein,S. ; Cvetanovic,R. J.

Report Date : 11 AUG 1969

Pagination or Media Count : 7

Abstract : Cycloaddition of the photoexcited benzene to cis- and trans-2-butene in the gas phase has been studied at 25C. Different adducts are formed from the two geometric isomers of 2-butene. Nmr analyses of the addition products show that the two main adducts from trans-2-butene are two stereoisomers (endo, exo and exo, endo) of the major adduct from cis-2-butene (6,7-dimethyltricyclo(3.3.0.0(2,8)oct-3-ene). The cycloadditions to both cis- and trans-2-butene take place with retention of configuration of the butene moiety. This, together with the effects of small additions of oxygen and biacetyl, indicates that the excited singlet of benzene is involved in the photoaddition. The kinetics of the photoaddition has been studied and are discussed. (Author)

Descriptors :   (*ALKENES, ADDITION REACTIONS), (*BENZENE, *PHOTOCHEMICAL REACTIONS), NUCLEAR MAGNETIC RESONANCE, REACTION KINETICS

Subject Categories : Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE