| 摘要 |
1,156,378. Organic isocyanate derivatives of carbamates. FARBENFABRIKEN BAYER A.G. 10 Nov., 1967 [30 Nov., 1966], No. 51192/67. Heading C2C. N - Substituted - N - isocyanato methyl carbamic and thiocarbamic acid esters of the formula wherein R represents a branched or unbranched, saturated or unsaturated, aliphatic, cycloaliphatic or araliphatic radical with 1 to 12 carbon atoms, optionally substituted by a chlorine atom or cyano radical, X represents oxygen or sulphur, R<SP>1</SP> represents a branched or unbranched, saturated or unsaturated aliphatic, cycloaliphatic, araliphatic or aromatic, monovalent or divalent radical with 1-15 carbon atoms, optionally substituted by a chlorine atom or cyano radical, and n is 1 or 2, may be obtained by reacting an N-substituted-N- chloromethyl carbamic or thiocarbamic acid ester of the formula with an alkali or alkaline earth metal cyanate at a temperature of 30-230‹ C. in the presence of an inert solvent. Suitable solvents in which the reaction may be carried out include hydrocarbons, chloro- or nitro-substituted hydrocarbons, nitriles, esters, ethers, sulphones, amides and ketones, and inorganic solvents such as liquid sulphur dioxide, or mixtures of two or more solvents may be employed. |
