Tri-piperdine compounds as stabilisers for organic meterials

摘要

The compounds of formula VIIIa-1 <IMAGE> (VIIIa-1) where R1 is hydrogen, alkyl, O., OH, NO, CH2CN, alkoxy, cycloalkoxy, alkenyl, phenylalkyl, alkanoyl, alkenoyl or benzoyl, are valuable intermediates for the preparation of selected hindered amine light stabilizers.