HEAT STABLE AMINOPYRIDINE CATALYSTS

摘要

The invention provides a heat stable 4-(secondary or tertiary)aminopyridine catalyst which has an APHA color of less than about 50 and exhibits an increase in APHA color of no greater than about 50 when heated in a nitrogen atmosphere at about 120.degree.C for about 24 hours as well as an amorphous 4-(secondary or tertiary)aminopyridine catalyst having an APHA color of less than 20. The catalysts are useful for acylation and other reactions, especially acylation reactions useful in the pharmaceutical and agricultural industries.