ACTIVATION PARAMETERS OF AN ORGANOTIN CATALYZED ALCOHOL-ISOCYANATE REACTION

In this paper, the kinetics of the reaction of phenylisocyanate with cyclopentanol, catalyzed by di(n-butyl)tin di-(2-ethylhexanoate) (DBTDEH), was studied at different temperatures in the same solvents as previously [1], i.e in acetonitrile (ACN), di-(n-butyl)ether (DBE) and toluene (Tol), in order to determine the Arrhenius energy, which is shown to be larger in the presence of the tin(IV) catalyst than in its absence [2], and the apparent activation entropy, which was derived from the values of the extrapolated intercepts of the In k-//7"graphs.The results demonstrate that entropic configurational effects are the prevailing cause of the accelerating effect of the tin(IV) catalyst on this reaction.

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