abstract |
The instant invention discloses a process for the preparation of compounds of the formula I: n n nwherein the general symbols are as defined in claim 1 , which process comprises reacting a compound of formula II: n n nwherein the general symbols are as defined in claim 1 , with a compound of the formula III: n n nwherein R 5 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. |