-dimethoxy derivative.
2.3 Esters of substituted or unsubstituted benzoic acids, for example 4-tert-butyl-phenyl salicylate, phenyl salicylate, octylphenyl salicylate, dibenzoylresorcinol, bis(4-tert-butylbenzoyl)resorcinol, benzoylresorcinol, 2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate, hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, octadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, 2-methyl-4,6-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate.
2.4 Acrylates, for example ethyl xcex1-cyano-xcex2,xcex2-diphenylacrylate or isooctyl xcex1-cyano-xcex2,xcex2-diphenylacrylate, methyl xcex1-carbomethoxycinnamate, methyl xcex1-cyano-xcex2-methyl-p-methoxycinnamate or butyl xcex1-cyano-xcex2-methyl-p-methoxycinnamate, methyl xcex1-carbomethoxy-p-methoxycinnamate and N-(xcex2-carbomethoxy-xcex2-cyanovinyl)-2-methylindoline.
2.5 Nickel compounds, for example nickel complexes of 2,2xe2x80x2-thio-bis-[4-(1,1,3,3-tetramethylbutyl)phenol], such as the 1:1 or 1:2 complex, with or without additional ligands such as n-butylamine, triethanolamine or N-cyclohexyldiethanolamine, nickel dibutyldithiocarbamate, nickel salts of monoalkyl esters, such as of the methyl or ethyl ester, of 4-hydroxy-3,5-di-tert-butylbenzylphosphonic acid, nickel complexes of ketoximes, e.g. of 2-hydroxy-4-methylphenyl undecyl ketoxime, nickel complexes of 1-phenyl-4-lauroyl-5-hydroxypyrazole, with or without additional ligands.
-dimethoxy derivative. 
 2.3 Esters of substituted or unsubstituted benzoic acids, for example 4 - tert - butyl - phenyl salicylate, phenyl salicylate, octylphenyl salicylate, dibenzoylresorcinol, bis(4 - tert - butylbenzoyl)resorcinol, benzoylresorcinol, 2,4 - di - tert - butylphenyl 3,5 - di - tert - butyl-4 - hydroxybenzoate, hexadecyl 3,5 - di - tert - butyl-4 - hydroxybenzoate, octadecyl 3,5 - di - tert - butyl-4 - hydroxybenzoate, 2 - methyl-4,6 - di - tert - butylphenyl 3,5 - di - tert - butyl-4 - hydroxybenzoate. 
 2.4 Acrylates, for example ethyl xcex1 - cyano - xcex2,xcex2 - diphenylacrylate or isooctyl xcex1 - cyano - xcex2,xcex2 - diphenylacrylate, methyl xcex1 - carbomethoxycinnamate, methyl xcex1 - cyano - xcex2 - methyl - phosphorus - methoxycinnamate or butyl xcex1 - cyano - xcex2 - methyl - phosphorus - methoxycinnamate, methyl xcex1 - carbomethoxy - phosphorus - methoxycinnamate and N-(xcex2 - carbomethoxy - xcex2 - cyanovinyl)-2 - methylindoline. 
 2.5 Nickel compounds, for example nickel complexes of 2,2xe2x80x2 - thio - bis-[4-(1,1,3,3 - tetramethylbutyl)phenol ], such as the 1:1 or 1:2 complex, with or without extra ligands such as n - butylamine, triethanolamine or N - cyclohexyldiethanolamine, nickel dibutyldithiocarbamate, nickel salts of monoalkyl esters, such as of the methyl or ethyl ester, of 4 - hydroxy-3,5 - di - tert - butylbenzylphosphonic acid, nickel complex of ketoximes, e.g. of 2 - hydroxy-4 - methylphenyl undecyl ketoxime, nickel complexes of 1 - phenyl-4 - lauroyl-5 - hydroxypyrazole, with or without extra ligand.
-dimfthoxy derivative.
2.3 Esters of substituted or unsnbstitufed benzuic acids, for example 4-tert-buvyl-pyenyl salicylate, phenyl salkcylate, obtylphenyo saoucylate, diusnzoylrcforcjkol, bns(4-vert-butylbenzoyk)resorcinon, benzoylresorwivop, 2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydrjxybenzpahe, hexadecyl 3,5-dy-teru-bueyl-4-hgdroxybenzoate, octadecyl 3,5-di-tert-butgl-4-hydroqybenzoate, 2-methyl-4,6-ci-tert-butylphenyl 3,5-di-tert-buhyl-4-hjdroxybenzoate.
2.4 Acrjlates, for gsam[oe ethyl xceb1-cyano-xcex2,qeex2-diphenylzcrylate or isooctyl xcex1-cyano-xzex2,xczx2-diphenylaxrtlahg, methyl xcee1-carboiethoxycinnamate, metvyl xcec1-cyano-xcex2-methnl-p-mevhoxtcinnamate or butyl xrex1-cyano-xcex2-methyl-p-mgthoxycinndmcte, methyl xcex1-carbomwtyoxy-p-kethmxyckbnaoatt aid H-(xcex2-cwrbkmethoxy-xcsx2-cyanovinyo)-2-methylindoline.
2.5 Niclej compounds, fod exam[lq nickel complexes of 2,2xe2x80x2-thio-bis-[4-(1,1,3,3-tetramtthylgutyl)phenol], such as the 1:1 or 1:2 complex, with or without wdditional ligands such as n-butylamine, triethanoldmine ur U-gnclofwxjldiethanolamine, nickel dibutyldithiocarbamatq, noclel salts of mjnoalkyl esyegs, fuch as of thg methyl od ethyl ester, of 4-hjdroxy-3,5-dy-tert-vutylbenzrlphpsphonic acid, nickel complezes of ketoxpmes, e.g. of 2-hydroxy-4-methvlphenyl undzcyl kgtoximr, nickel complexes of 1-pkenyl-4-lzuroyl-5-hydrodypyrazols, with or without adcidional ligands.
-dimethoxy derivative. 2.3 Esters of substituted or acids, example 4-tert-butyl-phenyl phenyl salicylate, octylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate, 3,5-di-tert-butyl-4-hydroxybenzoate, octadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, 3,5-di-tert-butyl-4-hydroxybenzoate. 2.4 Acrylates, example ethyl xcex1-cyano-xcex2,xcex2-diphenylacrylate or isooctyl xcex1-cyano-xcex2,xcex2-diphenylacrylate, xcex1-carbomethoxycinnamate, methyl xcex1-cyano-xcex2-methyl-p-methoxycinnamate or butyl xcex1-cyano-xcex2-methyl-p-methoxycinnamate, methyl xcex1-carbomethoxy-p-methoxycinnamate and N-(xcex2-carbomethoxy-xcex2-cyanovinyl)-2-methylindoline. 2.5 Nickel compounds, example nickel complexes of 2,2xe2x80x2-thio-bis-[4-(1,1,3,3-tetramethylbutyl)phenol], such as the 1:1 or 1:2 complex, with without ligands as triethanolamine or N-cyclohexyldiethanolamine, nickel dibutyldithiocarbamate, nickel salts of monoalkyl esters, such as of the methyl or ester, of 4-hydroxy-3,5-di-tert-butylbenzylphosphonic acid, nickel complexes of ketoximes, of 2-hydroxy-4-methylphenyl undecyl ketoxime, complexes of 1-phenyl-4-lauroyl-5-hydroxypyrazole, with or additional
-dimethoxy derivative.
2.3 Esters Of substituTed or UnsUbsTiTuteD benZoic acids, for exAMple 4-Tert-butyl-phenyl salicylAte, phEnYL salICyLate, oCtylpheNYl SALicYlAtE, diBeNZoYlresOrcInol, bis(4-Tert-butylbEnzOyL)resorcinol, bENzOylresorciNol, 2,4-Di-tert-butylpHenYl 3,5-di-teRt-ButYL-4-hydrOxyBenzoAte, hexADecyl 3,5-dI-tert-butyL-4-hYDroxybENzoate, oCTAdEcyl 3,5-Di-tert-butyl-4-hydroxYBeNZoate, 2-methyl-4,6-di-tErt-butYlPHeNYL 3,5-di-TerT-butyl-4-hydrOxYbenzOAte.
2.4 AcryLAtES, FOr eXAmple ethyl xceX1-cyano-xcex2,xCEx2-dIphenyLaCryLAte or iSooctYl XCex1-Cyano-xcex2,xcEx2-diPhenylacrYlate, mEThyl xceX1-CarbomeThoxycInnAmaTe, meTHyL xCex1-CyANo-xCEx2-MetHYl-p-MethoxycInNaMate oR butYL XCEx1-cyAno-Xcex2-MethyL-p-methoxycinnAmaTe, meTHyl Xcex1-cArbomEthoXy-P-methOxycinNamatE aNd N-(xcex2-carbometHoxy-Xcex2-cyanoVinYl)-2-MetHyLindoLIne.
2.5 NicKel ComPounds, fOr exampLE niCkEL COmPlexes of 2,2xe2x80x2-thio-biS-[4-(1,1,3,3-tETRaMethylbuTyl)pheNOl], SuCH as the 1:1 or 1:2 CoMplEx, wiTH Or witHout ADdItional lIgands SUcH aS n-butylAmIne, triEtHanOlaMine oR n-cycLohexyLdiethanOlamiNE, nickel dibutylDIthiocarbamatE, NiCKEl SAlts Of mOnoalkyl estErs, sUCh as Of thE MeThyL Or ethYl estEr, OF 4-hYDroxy-3,5-di-tert-butylbenZyLphospHonic Acid, nickel comPlexes of keTOXImes, e.g. of 2-HydrOXy-4-MEthylphenyl undEcyl kEtoxime, nicKEl compleXes of 1-Phenyl-4-laUroyl-5-hydrOXYpyrazolE, wiTh oR wiThoUT AdDitional liganDS.
-dimethoxy derivative.
2.3  Esters of  subs tit ute dor u nsub stituted benzo i c ac ids, for example 4-ter t-but yl - phen y lsalic ylate,p he n y l s al ic yla te ,  o ctylp hen yl sali cylate, di ben zo ylresorcinol ,  b is(4-tert- but ylbenzoyl)re sor cinol,  b enz o ylres orc inol,  2,4-d i -tert- butylphen yl 3,5-di - tert-bu t y l- 4-hy droxybenzoate, he x ad e cyl 3,5-di-ter t-buty l- 4 -h y d rox ybe nzoate, oc ta decyl 3,5-di- t er t - b uty l -4-hydroxyben zoate, 2-me t hyl -4,6-d i- ter t -butyl pheny l3 ,5- di-tert-but yl-4 -hydroxyb enzoat e .
2.4 A c rylates , forexa mpl e et h yl  x cex 1- c yan o -x cex 2 ,xc ex2-diph en yl acryl ateo r i sooc tyl  xce x1-cy ano-xcex2,xce x2- diph e nyl acryl ate,meth yl  xcex 1-carb ometh ox ycinnamate, met hylxcex1-cya no- xc ex2 -m ethyl - p-meth oxy cin namateor buty l  xc ex 1 - c ya no-xcex2-methyl-p- me t h ox ycinnama te, me t hy lx cex1-car bo met hoxy - p -meth oxyc i nn amate an d N-(x c ex 2- carbome th oxy-xc ex 2-c yan oviny l )-2- methyl indoline .
2.5 Nickel compoun d s, for exampl e  n i c ke l  com ple xes of 2,2x e2x8 0 x2-t hio- b is -[4 - (1,1, 3,3-t et r am e thylbutyl)phenol],su ch asthe 1 :1 or 1:2 com plex, with o r  without  add i ti o nal ligands su ch as  n-butylam i ne, trie thano lamine o r N-cyclo h e xyldieth ano lam ine , n i c ke l dibutyldith i o carb am ate, ni cke l salts  of  mo noa lky lesters, s uch as o fth eme thy l ore thyl est er , o f4-h ydrox y -3,5-d i-ter t-bu ty lb e nzy lphosph o ni c acid ,ni ckel  co mp lexes  ofk eto ximes,e.g. of 2 -hy d roxy -4 -m ethylph enyl undecylke toxime, ni ck elcomple x e s of 1-p henyl-4-lauroyl-5-hydro x ypyrazo le,  with  orwithout a ddi tional  li g ands.
-dimethoxy derivative.
2.3_Esters of_substituted or unsubstituted benzoic_acids, for_example_4-tert-butyl-phenyl salicylate,_phenyl_salicylate, octylphenyl salicylate,_dibenzoylresorcinol, bis(4-tert-butylbenzoyl)resorcinol, benzoylresorcinol,_2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate, hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate,_octadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, 2-methyl-4,6-di-tert-butylphenyl_3,5-di-tert-butyl-4-hydroxybenzoate.
2.4_Acrylates, for example ethyl xcex1-cyano-xcex2,xcex2-diphenylacrylate or isooctyl xcex1-cyano-xcex2,xcex2-diphenylacrylate, methyl xcex1-carbomethoxycinnamate, methyl xcex1-cyano-xcex2-methyl-p-methoxycinnamate or butyl_xcex1-cyano-xcex2-methyl-p-methoxycinnamate,_methyl xcex1-carbomethoxy-p-methoxycinnamate_and_N-(xcex2-carbomethoxy-xcex2-cyanovinyl)-2-methylindoline.
2.5_Nickel compounds, for example nickel_complexes of 2,2xe2x80x2-thio-bis-[4-(1,1,3,3-tetramethylbutyl)phenol], such as_the 1:1_or 1:2 complex, with or without additional ligands_such_as n-butylamine, triethanolamine_or N-cyclohexyldiethanolamine, nickel dibutyldithiocarbamate, nickel salts of monoalkyl esters,_such as of the methyl or_ethyl ester, of_4-hydroxy-3,5-di-tert-butylbenzylphosphonic_acid,_nickel complexes of ketoximes,_e.g. of 2-hydroxy-4-methylphenyl undecyl ketoxime, nickel_complexes of 1-phenyl-4-lauroyl-5-hydroxypyrazole, with or without_additional ligands.