Preparation of aromatic cyanates
US4748270A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1983 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Nov 16, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2603/68
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
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.degree. C. or below under conditions such that a cyanogen chloride is prepared; (b) 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; and (c) 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.degree. C. or less under conditions such that a polyaromatic cyanate is prepared.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.