The isocyanate reactions of class (a) are also extremely susceptible to catalysis. The various
isocyanate reactions are influenced to different extents by different catalysts. Many
commercial applications of isocyanates utilize catalysed reactions. Tertiary amines, metal
compounds like tin compounds (as mentioned earlier in the chapter) are most widely used
catalysts for the reaction (Schemes 10 and 11). The mechanisms are similar to that of the
uncatalyzed reaction