| 摘要 |
1289355 Haloisocyanates FARBWERKE HOECHST AG 19 Sept 1969 [20 Sept 1968] 46232/69 Addition to 1227007 Heading C2C Compounds of formula in which X is chlorine or bromine, R is an aliphatic, cycloaliphatic or araliphatic group, R 2 , R 3 and R 4 are hydrogen, C 1-18 -alkyl or alkenyl, C 3-8 -cycloalkyl or cycloalkenyl, aralkyl, aryl or heterocyclic group, optionally substituted by one or more groups inert to isocyanate groups, or two of R 2 , R 3 and R 4 form an alkylene or alkenylene group having up to 6 carbon atoms or form part of a polycyclic carbocyclic or heterocyclic ring system having up to 18 carbon atoms, the compound optionally containing a further #-halo-substituted isocyanate group, are prepared by reaction of an α-R 3 , R 4 -#-R 2 , -COOR- substituted-lactam with a free radical-forming catalyst, in the presence of a compound containing one or more non-aromatic carbon-carbon multiple bonds. N-bromo-#-lactam-starting materials are prepared by N-bromination. |
