| abstract |
Case 3-13913/S/+ Process for the preparation of 1-diorganocarbamoyl-polyalkylpiperdines Abstract Compounds containing a group of the formula I in which R is H or c1-c4-alkyl, R1 is H, CN, an acyloxy group or a free valency and R2 and R3 are organic radiclLs can be prepared in a simpLe manner from the corresponding compounds containing a group of the formula Ia by stepwise reaction with phosgene and a secondary amine R2-NH-R3 in the presence of a molar amount of a base. The N-diorganocarbamoyl compounds containing the group I are outstanding light stabilisers, in particular for organic polymers. They can be converted by secondary reactions into other compounds which contain the group I and which are not accessible by direct phosgenation. Many of the products thus obtainable by phosgenation or conversion are novel compounds. |