Patent ID: 6225492
Filing Date: 2001-05-01
Classification: C07C

Abstract:
A method for purifying a cyanate wherein a cyanate crude product solution comprising a cyanate represented by the general formula (1), an unsubstituted phenol and non-alcoholic solvent is allowed to contact with a poor solvent containing an alcohol and water, to crystallize or precipitate said cyanate: ##STR4##in the formula (1), A.sup.1 to A.sup.3 each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; X represents a single bond, an organic group having 1 to 20 carbon atoms, a carbonyl group, a sulfone group, a divalent sulfur atom or oxygen atom; n represents an integer of 0 to 3; and i.sup.1 to i.sup.3 each independently represents an integer of 0 to 4.