Hydroxy benztriazole

Potassium bromide Sodium nitrite Dibenzyl malonate Hydroxy benztriazole... 

Benzyl (2-benzyloxycarbonyl-5-methyl-3R-t-butoxycarbonyl)hexanoate (281.4 g, 0.56 mol) was taken up in 5% water in TFA (410 ml) and allowed to stand at 5°C overnight. After this time the TFA was evaporated under reduced pressure then the residue partitioned between DCM (1 L) and brine (200 ml). Solvent removal left an oil which crystallised on standing (230.0 g). The crude acid from this reaction was dissolved in DMF (1 L), then hydroxy benztriazole (95.3 g, 0.64 mol), N-methylmorpholine (64.0 g, 0.64 mol) and... 

The [4-N-hydroxy-2R-isobutyl-3S-(thienylthiomethyl)succinyl]-L-phenylalanine-N-methylamide and hydroxy benztriazole were dissolved in DCM/DMF (4 1) and the mixture cooled to 0°C before adding N-(dimethylaminoethyl)-N -ethylcarbodiimide and N-methylmorpholine. The mixture was stirred at 0°C or 1 h to ensure complete formation of the activated ester. Hydroxylamine hydrochloride and NMM were dissolved in DMF then this mixture added dropwise to the cooled solution of the activated ester. After 1 h the reaction was poured into ether/water (1 1) whereupon the desired product precipitated as white crystals. These were collected by filtration, further washed with ether and water then dried under vacuum at... 

Hydroxy-5-methyl-phenyl)benztriazole (Tinuvin P, Ciba-Geigy)... 

Under long-wavelength UV light (A = 365 nm) the 2-(2-hydroxyphenyl)-benztri-azoles yielded yellow-green fluorescent chromatogram zones, which were, in the cases of Tinuvin P (hRi 20 — 25) and Tinuvin 343 (2-[2-hydroxy-3-(l-methylpropyl)-5-ter/-butylphenyl]benztriazole hR( 45 — 50), suitable for quantitation. 

Benztriazole, derivatives 281 ff 2-(2-Hydroxy-5-niethylphenyl)- 282 2-(2-Hydroxy-3-(l -methylpropyl)-5-tert-butylphenyl- 283 Berberine reagent 44,213 Beryllium cations 144,145,311,312 Besthorn s hydrazone reagent 347 Beta-blockers 74, 299, 301, 426—428 Beta-fronts 126 Beta-radiation 12 Betulae, Extr. 279 Betulic acid 59... 

Benzo(b)fIuoranthrene la 39, 85 Benzo(k)fluoranthrene la 39, 86 Benzo(ghi)perylene la 39,85 Benzophenone derivatives lb 282 Benzo(a)pyrene la 39,85,103 p-Benzoquinone derivatives la 72 Benzothiazoles lb 237 Benzoyl chloride la 70 Benzoylecgonine lb 32,34,35 3,4-Benzpyrene la 60 Benzthiazide lb 188 Benztriazole, 2-(2-hydroxy-5-methyl-phe-nyl)- la 282... 

Hydroxy-6-aminobenztriazole or 6-Aminobenz-azimidole(called oxy-6-amino-benztriazol in Ger)... 

Din itro-4-hydroxy-2( 2,4,6-trini tro-3-hydroxyphenyI)-benztriazole, called in German 5- 7-Dinitro-4-oxy-2[2.4 6-trinitro-3-oxyphenyl -benzlriazol,... 

Dinitro4-hydroxy-2-(2,4,6-trinitro-3-hydroxyphenyl)-benztriazole 5 D1390... 

Hydroxy benzophenyltriazole (called Oxyphenyl-benztriazol in Ger), C 12HgN30 mw 211.22, N 19-90%. Several isomers are described in Beil... 

The following isomer is described in the literature Benzotriazol- l-ol or (B enzo-1-hydroxy) - a -vic-tri-azole (called 1-Oxy-benztriazol Benzazimidol or Benzolazimidol in Ger), HCk CH—C—N(OH)y ... 

Some uv absorbers, such as, for example, o-hydroxy benzophenones or 2-(2-hydrophenyl)benztriazoles, absorb the incident light in the hydrogen bonds and convert it into ir radiation. Other compounds, such as the phenyl salicylates, first change photochemically into o-hydroxy benzophenones ... 

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