Hydroxy phenyl benzotriazole

The most widely used UV absorbers are 2-hydroxy-benzophenones, 2-hydroxy-phenyl-benzotriazoles and 2-cyanodiphenylacrylate. 

Five main groups of chemical compounds show sufficient protective activity to be commercially important substituted 2-hydroxy phenyl benzotriazoles, substituted 2-... 

Low Volatility One of the least volatile hydroxy phenyl benzotriazoles commercially available. Onset of TGA when BB/200 is heated at lOC/min in air) weight loss is approximately 350C. Compared to competitive products which volatilize out of the polymer during high temperature processing, Mixxim BB/200 remains in the polymer to protect the finished product. 

Benzotriazol 6-Amino-5-methyl-2-(4-sulfo-phenyl)- X/3, 427 Thioharnstoff l-(4-Carboxy-3-hydroxy-phenyl)-3-(4-methyl-2-pyrimidyl)- IX, 891... 

Tinuvin 770 (2-(2-Hydroxy-3,5-bis( 1-methyl- l-phenylether)phenyl)benzotriazole) 52829-07-9... 

FIGURE 7. Absorption spectra of nonluminescent chelates 2-hydroxy-benzophenone (1) 2-hydroxy-4-methoxy-benzophenone (2) and 2(2 hydroxy-5 methyl-phenyl)benzotriazole (3) in CCI4. 

Hydroxyphenyl benzotriazoles have the structure (XV) where X is H or Cl (chlorine shifts the absorption to longer wavelengths), Ri is H or branched alkyl, and R2 is CH3 to CgHi7 linear and branched alkyl (Ri and R2 increase the affinity to polymers). Some technically important materials in this class are 2-(2 -hydroxy-5 -methyl-phenyl)-benzotriazole, 2-(2 -hydroxy-3 -5 -(Ji.fert-butyl-phenyl)-benzotriazole, and 2-(2 -hydroxy-3, 5 -di-tert-butyl-phenyl)-5-chlorobenzotriazole. In comparison with 2-hydroxybenzophenones, the 2-(2 -hydroxyphenyl) benzotriazoles have higher molar extinction coefficients and steeper absorption edges towards 400 nm. 

Hydroxy-5 -methylphenyl)benzotriazole 2-(2 -Hydroxy-5 -tert-butylphenyl)benzotriazole 2-(2 -Hydroxy-3 -tert-butyl-5 -methylphenyl)-5-chlorobenzotri azole 2-(3,5-Di-tert-butyl-2-hydroxyphenyl)-5-chlorobenzotriazole 2-[2 -Hydroxy-3, 5 -bis(a,a-dimethylbenzyl)phenyl]benzotriazole... 

Benzotriazole 2,2-(2-hydroxy-5-tert-octylphenyl) benzotriazole 2-(3 -tert-butyl-2-hydroxy-5-methylphenyl)-5-chlorobenzotri azole 2-(3, 5 -di-tert-butyl-2 -hydroxyphenyl)-5 -chlorobenzotri azole 2-(2 hydroxy-3 -5 -di-tert amyl phenyl) benzotriazole 2-(2-hydroxy-5-methylphenyl) benzotriazole... 

Synonym 2-[2 -hydroxy-3, 5 -bis(-dimethyl benzyl)-phenyl-benzotriazole ... 

Synonym 2-[3-(2H-benzotriazol-2-yl)-4-hydroxy-phenyl]ethyl methacrylate ... 

Chemical name reaction products of methyl 3-(3-(2H-benzotriazole-2-yl)-5-t-butyl-4-hydroxy-phenyl) propionate/PEG 300 ... 

Table 3.4 Influence of stabilization on polystyrene disooloration (injection molded plates, 2 mm) during exposure in the weatherometer WRC 600 AO n-ootadecyi-3-(3 , 5 -di-tert-butyt4 -hydroxy-phenyljpropionate (IRGANOX 1076), UVA 2-(2,2 -hydroxy-5 -methyl-phenyl)benzotriazole (TINUVIN P), HALS sebacic aoid bis-2,2,6,6 tetramethyt-4-piperidylester (TINUVIN 770) [86]...

Di-t-butyl-p-cresol, (2-hydroxy-5-methyl-phenyl) benzotriazole... 

Amino-2-phenyl-2//-benzotriazole reacted with epichlorhydrin in chlorobenzene at 140-145°C to give the A-benzyl-7-hydroxy-6,7,8,9-tetrahydrotriazolo-quinoline derivative 194. This was benzylated and rearranged by heating in DMSO to give the isomeric 7-benzyloxy derivative 195 (Scheme 59) (77MI2). 

Some interesting fused 1,2,3-triazole ring systems have been reported. A series of 5-piperidyl-substituted 7-hydroxy-3f/-l,2,3-triazolo[4,5-d]pyrimidines 143 has been synthesized from pipecolinate esters, benzylazides, and cyanoacetamide <06CHE246>. 4-Alkylidene-5,6-dihydro-4//-pyrrolo-[l,2-c][l,2,3]triazoles 144 were prepared from alkylidenecyclopropanes via diiodogenation/Cu(I)-catalyzed 1,3-dipolar cycloaddition/intra-molecular Heck reaction sequence <06SL1446>. 6,6-Dimethyl-2-phenyl-4,5,6,7-tetrahydro-27/-benzotriazol-4-one 145 were prepared from A-(5,5-dimethyl-3-oxocyclohexenyl)-S,S-diphenylsulfilimine and... 

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