A kinetic and thermodynamic study of the deblocking of urethanes is presented; the blocking agents are phenols, aliphatic alcohols and a polyether. The deblocking occurs via the elimination-addition mechanism. n the transamination reaction, the rate determining step is the amine catalyzed dissociation of the blocked isocyanate. The equilibrium constants of these reactions give the relative stability of blocked isoc anates. The dissociation equilibrium of several urethanes were also determined; temperature higher than T70"C are required to obtain a significant dissociation in the case of usual urethanes.
ChemInform Abstract The blocking agents for the urethanes investigated are phenols, aliphatic alcohols and a polyether. The deblocking occurs via an elimination-addition mechanism. In the transamination reaction, the rate determining step is the amine-catalyzed dissociation of blocked isocyanates. The dissociation equilibria of several urethanes are also determined: temp. higher than 170 rc C are required to obtain a significant dissociation in the case of usual urethanes.
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