ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 37, Number 6
JKCSEZ 37(6)
December 20, 1993 

Ultraviolet spectrophotometric investigation has been carried out on the system of iododestannylation iodine and tetramethyltin in methanol. The transient CT absorption spectrum can be observed and the subsequent disappearance of CT absorption spectrum was accompained by the cleavage of tetramethyltin with iodine. From there, the rate constants for the iododestannylation were determined at 10, 25 and 35℃ up to 1600 bar and the reaction rates were increased with increasing temperature and pressure. From these rate constants, the values of the activation parameters (△V≠, △β≠, △H≠, △S≠ and △G≠) were obtained. The activation volumes and activation compressibility coefficients were both negativity. The activation enthalpies were positive and activation entropies had large negative values. From these values discussed in terms of solvent structure variation of transition state and mechanism. From these results, it was found that the reaction is followed with SE2 mechaenism and weakened SE2 mechanism nature by increasing pressure.