Compounds of the formula ##STR1## in which Z, Z' and Z" independently of one another are a group of the formula II ##STR2## and R.sub.7 is a radical of the formula III, IV or V ##STR3## in which n is 1 or 2; R.sub.4, R.sub.5 and R.sub.6 independently of one another are C.sub.1 -C.sub.18 alkyl; C.sub.5 -C.sub.12 cycloalkyl; C.sub.2 -C.sub.18 alkenyl; phenyl; C.sub.7 -C.sub.11 phenylalkyl; C.sub.7 -C.sub.11 alkylphenyl; C.sub.1 -C.sub.18 alkyl substituted by phenyl, OH, C.sub.1 -C.sub.18 alkoxy, C.sub.5 -C.sub.12 cycloalkoxy, C.sub.3 -C.sub.18 alkenyloxy, COOH, COOR.sub.11, O--COR.sub.12, CONH.sub.2, CONHR.sub.13, CONR.sub.13 R.sub.14, CN, NH.sub.2, NHR.sub.13, NR.sub.13 R.sub.14, NHCOR.sub.12, C.sub.6 -C.sub.15 bicycloalkyl, C.sub.6 -C.sub.16 bicycloalkyl-alkoxy, C.sub.6 -C.sub.16 bicycloalkenyl-alkoxy or C.sub.6 -C.sub.15 tricycloalkoxy; C.sub.5 -C.sub.12 cycloalkyl substituted by OH, C.sub.1 -C.sub.4 alkyl, C.sub.2 -C.sub.6 alkenyl or O--COR.sub.12 ; or COR.sub.15 ; CO--X--R.sub.11 ; or SO.sub.2 --R.sub.16 ; or C.sub.3 -C.sub.50 alkyl interrupted by O and/or substituted by OH, phenoxy or C.sub.7 -C.sub.18 alkylphenoxy; or R.sub.5 and R.sub.6 together form a ring structure; X and Y independently of one another are O, NH, NR.sub.13 or S; and the other symbols are as defined in claim 1 are effective as stabilizers for organic material against the damaging effect of light, oxygen and/or heat.

I residui del ## del ## STR1 di formula in cui la Z, la Z 'e la Z "da una un altro sono indipendentemente un gruppo del ## del ## STR2 di formula II e del R.sub.7 è un radicale delle formule III, IV o V ## del ## STR3 in cui la n è 1 o 2; R.sub.4, R.sub.5 e R.sub.6 da uno un altro sono indipendentemente C.sub.1 - alchile C.sub.18; C.sub.5 - Cycloalkyl C.sub.12; C.sub.2 - alchenile C.sub.18; fenilico; C.sub.7 - Phenylalkyl C.sub.11; C.sub.7 - alkylphenyl C.sub.11; C.sub.1 - L'alchile C.sub.18 ha sostituito da fenile, dall'OH, da C.sub.1 - C.sub.18 alcossi, C.sub.5 - cycloalkoxy C.sub.12, da C.sub.3 - C.sub.18 alkenyloxy, COOH, COOR.sub.11, O -- COR.sub.12, da CONH.sub.2, da CONHR.sub.13, da CONR.sub.13 R.sub.14, da CN, da NH.sub.2, da NHR.sub.13, da NR.sub.13 R.sub.14, da NHCOR.sub.12, da C.sub.6 - C.sub.15 bicycloalkyl, C.sub.6 - C.sub.16 bicycloalkyl-alcossi, da C.sub.6 - C.sub.16 bicycloalkenyl-alcossi o da C.sub.6 - tricycloalkoxy C.sub.15; C.sub.5 - Il cycloalkyl C.sub.12 ha sostituito dall'OH, da C.sub.1 - C.sub.4 alchile, C.sub.2 - alchenile C.sub.6 o dalla O -- COR.sub.12; o COR.sub.15; CO -- X -- R.sub.11; o SO.sub.2 -- R.sub.16; o C.sub.3 - l'alchile C.sub.50 ha interrotto da O e/o ha sostituito dall'OH, fenossi o da C.sub.7 - il alkylphenoxy C.sub.18; o R.sub.5 e R.sub.6 formano insieme una struttura dell'anello; X e Y da uno un altro sono indipendentemente O, il NH, NR.sub.13 o S; e gli altri simboli sono come definito nella rivendicazione 1 sia efficace come stabilizzatori per materiale organico contro l'effetto offensivo di luce, di ossigeno e/o di calore.

 
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