Preparation of aromatic cyanates

Details Preparation of aromatic cyanates Preparation of aromatic cyanates

C - Chemistry, Metallurgy

07

C

260/386, 260/454

C07C 261/02 (2006.01)

Patent

CA 1249996

-24- ABSTRACT OF THE DISCLOSURE This invention is directed to a process for the preparation of an aromatic cyanate which comprises (a) preparing in situ a cyanogen chloride by contacting a solution of chlorine in a chlorinated hydrocarbon with an aqueous solution of an alkali metal cyanide at a temperature of 0°C or below under conditions such that a cyanogen chloride is prepared; and (b) contacting the cyanogen chloride dissolved in the chlorinated hydrocarbon with a hydroxy-substituted aromatic compound dissolved in a chlorinated hydrocarbon, a secondary alcohol or a tertiary alcohol, in the presence of a tertiary amine at a temperature of about 0°C or less under conditions such that a polyaromatic cyanate is prepared characterized by in step (a) physically separating the chlorinated hydrocarbon in which the cyanogen chloride is dissolved from the aqueous layer in which an alkali metal chloride salt is dissolved. 31,897-F -24-

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