FIELD: chemical industry. SUBSTANCE: 2,2,6,6- tetramethylpiperidine derivatives of formula I: 
wherein R is hydrogen; R1 is C1-C18-alkyl, C5-C8 cycloalkenyl; and A3-A5 is -0- or NR3 in which R3 is hydrogen, C2-C4-alkanoyl when (a) n is 1, A3-A5 is NR3, A1 is monovalent residue and hydrogen, C1-C18-alkyl, (b) n is 1 when A2-A4 is hydrogen or A1 together with A4 form C2-C8- alkylene, A2 is oxygen or CH2, A3-A5 is -0- or (c) n is 1, A3-A5 is -0- and A2 is -0-; then A1 together with A4 form 
when n is 2, A5-A5 is NR3, A2-A4 is hydrogen, then A1/ is group of formula: 
wherein d is 2-10 or A1 is group of formula: 
; T8 and T9 are hydrogen, C1-C12- alkyl or T8 and T9 together form trioxapentamethylene. Compounds of formula I are useful as effective stabilizers of various organic materials, more particularly polymers, against light and oxygen. EFFECT: improved properties of the title compounds. 7 cl, 14 tbl
