Method for purification of cyclopentenolones
AssigneeSumitomo Chemical Company, Limited
InventorFumio Fujita
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Abstract
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.
Claims6
A method for purifying cyclopentenolone comprising reacting a cyclopentenolone of the formula (I), ##STR2## (wherein R.sub.1 represents a C.sub.1-4 alkyl, C.sub.3-4 alkenyl, C.sub.3-4 alkynyl or phenyl C.sub.1-4 alkyl group, and R.sub.2 represents hydrogen atom or a C.sub.1-4 alkyl group), with calcium chloride, separating the formed cyclopentenolone-calcium chloride complex from the reaction mixture, and decomposing the complex with water to obtain the purified cyclopentenolone.
Dependencies are inferred from the claim text.