Flash Photolysis Study for Halogen Abstraction of Ph3Sn* and Ph3Si* from Alkyl Halides

Article abstract of DOI:10.1246/bcsj.64.962

The reaction rate contants for halogen abstraction of Ph3Sn* and Ph3Si* have been determined by xenon-flash photolysis method.The absolute rate constants for the reactivity of Ph3Sn* with several alkyl halides have been compared with the relative ones; the agreement between the both methods was fairly good.For Ph3Sn*, the rate constant (in unit of mol^-1 dm³ s^-1) of n-BuCl (5.2*10²) was smaller than that of n-BuBr (3.1*10⁶) by a factor of ca. 1/10⁴.With changing the alkyl halides, the rate constants for Ph3Si* and Ph3Sn* varied similarly, although the rate constants for Ph3Si* were larger than those for Ph3Sn* by factors of 50 - 100.The reactivity of alkyl halides increased with a decrease in the bond-dissociation energy of the R-X (X=Cl, Br).