| 摘要 |
1318618 Omega-lactams SNIA VISCOSA SOC NATIONALE INDUSTRIA APPLICAZIONI VISCOSA SpA 30 June 1970 [5 July 1969] 31572/70 Heading C2C A process for the preparation of an omegalactam having the formula or a precursor thereof (i.e. a compound formed in the process and which can be converted to the lactam by conventional means) comprises nitrosating a cyclomethylene ketene of the formula wherein n has the same value as in the lactam, using a nitrosation agent capable of providing NO + ions in the reaction medium at a temperature of from -60‹ C. to +100‹ C. The nitrosation is preferably carried out in an organic solvent, e.g. CCl 4 or a liquid hydrocarbon using a nitrosating agent of the formula NOX wherein X is nitro, chloro, bisulphate, alkoxy or aryloxy, the molar ratio of the ketene and nitrosating agent (expressed in terms of its content of NO) being between 0À6 : 1 and 1À1 : 1. |
