| abstract |
The instant invention discloses a process for preparation of compounds of the formula I, wherein the general symbols are as defined in claim 1, which process comprises reacting a compound of formula II, wherein the general symbols are as defined in claim 1, with a compound of the formula III, wherein R5 is as defined in claim 1. The compounds of the formula II are new and useful as stabilizers for protecting organic materials, in particular synthetic polymers, reprographic materials or coating materials against oxidative, thermal or light-induced degradation. |