Method for purification of cyclopentenolones

摘要

Purification of cyclopentenolone such as, for example, 2-propargyl-3-methyl-4-hydroxy-2-cyclopenten-1-one, which is an intermediate to manufacture pyrethroidal insecticides, is made by reacting with calcium chloride to form the cyclopentenolone-calcium chloride complex and then decomposing the complex with water.