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Abstract
AbstractThe rate constants of reactions between 4, 4′‐di‐isocyanato‐diphenylmethane (MDI) and alcohols in N, N‐dimethylformamide (DMF) have been determined by an UV‐spectroscopic method. On the basis of the kinetics observed and the values of the activation parameters ΔS ≠ and ΔH ≠, a proposal is made for a mechanism with a four‐centre transition state. The rate constants for the reaction of several alcohols with MDI in DMF are correlated with the extended Taft equation: equation image (Ecs = corrected steric substituent constant according to Hancock).
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