A two-color laser photolysis method for determining reaction rates of short-lived intermediates by product analysis: Application to the o-quinodimethane problem

作者：Ouchi A^*; Li Z; Sakuragi M; Majima T

来源：Journal of the American Chemical Society, 2003, 125(4): 1104-1108.

DOI：10.1021/ja027653v

A time-delayed, two-color pulse laser photolysis technique was used for a kinetic study of shortlived transient species through product analysis, the determination of the rate constant of the cycloaddition of o-quinodimethane (1) and maleic anhydride (2) in room-temperature Solutions. o-Quinodimethane (1) was generated from 1,2-bis[(phenylseleno)methyl]benzene (3) by the irradiation of a pulse of a KrF excimer laser (248 nm) in the presence of excess 2, and a successive pulse of a XeCl excimer laser (308 nm) was irradiated to the reaction mixture after varied delay times from 0 to 0.1 s for the decomposition of the remaining 1 to quench the cycloaddition reaction. The rate constant of the cycloaddition of 1 and 2 was 2.1 X 10(5) M-1 s(-1), which was obtained by the analysis of the delay-time dependence of the product yields.

• 出版日期2003-1-29