| 摘要 |
1470208 Isocyanatomethyl benzenes KAO SOAP CO Ltd 11 Oct 1974 [18 Oct 1973] 44153/74 Heading C2C Benzene derivatives having at least one isocyanatomethyl side chain are prepared by adding to liquid dimethylformamide containing less than 5% by weight of water and having completely dissolved therein a catalytic amount of an acidic chloride-dimethylformamide compound which has been prepared by reacting an anhydrous chloride or oxychloride of lithium, copper, beryllium, magnesium, calcium, zinc, aluminium, silicon, titanium, zirconium, vanadium, chromium or iron or mixtures thereof with dimethylformamide containing not more than 5% by weight of water, reactants consisting essentially of (1) a benzene derivative selected from chloromethylbenzene, bis-chloromethylbenzene, tris-chloromethylbenzene and nucleus-substituted derivatives thereof, wherein the substituents contain no atoms other than those of hydrogen, carbon, chlorine and oxygen, and (2) sodium cyanate having a purity of at least 70 weight per cent, the amount of the acidic chloride-dimethylformamide being from 0À01 to 10 mole per cent based on the sodium cyanate used, and reacting the resulting mixture at 60‹ to 160‹ C. until there is formed the corresponding benzene derivative having one or more isocyanatomethyl side chains. |
