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KMID : 1059519930370030287
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Journal of the Korean Chemical Society
1993 Volume.37 No. 3 p.287 ~ p.293
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The Effect of Pressure on the SF2 Cleavage Reaction of Tetramethyltin with Iodine
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Kwun Oh-Cheun
Kyong Jin-Burm
Lee Young-Hoon
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Abstract
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Ultraviolet spectrophotometric investigation has been carried out on the system of charge-transfer(CT) complex with iodine and tetramethyltin in n-hexane and acetone. From these results, the transient CT absorption spectrum can be observed and the subsequent disappearance of CT absorption spectrum is accompained by the cleavage of tetramethyltin with iodine (iododestannylation). Therefore, the rate constants for the iododestannylation were determined at 10, 25 and 35℃ up to 1600 bar and the rates of reaction were increased with increasing temperature and pressure. From these rate constants, the values of the activation parameters (△V≠, △β≠, △H≠ and △S≠) were obtained and discussed in terms of solvent structure variation of transition state and mechanism from these values. It could postulated that the reaction is followed with SF2 mechanism and weakened SF2 mechanism nature by increasing pressure.
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KEYWORD
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