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KMID : 1059519950390050350
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Journal of the Korean Chemical Society
1995 Volume.39 No. 5 p.350 ~ p.355
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The Effect of Pressure on the Iododestannylation between Tetramethyltin and Iodine
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Kwun Oh-Cheun
Lee Young-Hoon
Jeun In-Seung
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Abstract
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UV spectrophotometric investigation has been carried out on the system of charge-transfer (CT) complex with iodine and tetramethyltin in carbon tetrachloride solvent. The transient CT absorption spectrum can be observed in λmax=270nm and the subsequent disappearance of CT absorption spectrum was accompained by the cleavage of tetramethyltin with iodine (iododestannylation). From there, the rate constants for the iododestannylation were determined at 10, 20 and 35℃ up to 1200bar and the reaction rates were increased with increasing temperature and pressure. From these rate constants, the values of the activation parameters (ΔV≠, Δβ≠, ΔH≠ and ΔS≠) were obtained and 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 SF2 mechanism and weakened SF2 mechanism nature by increasing pressure.
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KEYWORD
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