2- 4- phenylazo benzoic acid

Tezuka s group (Tezuka and Ando, 1985 Tezuka et al., 1986) was able to isolate and characterize the benzenediazo ether of 1-naphthol (6.10). They stirred a solid mixture of the molecular complex 6.9 formed between an a-azohydroperoxide acid and benzene with an excess of 1-naphthol at room temperature in the dark for several hours. The separation of this solid by thin layer chromatography (silica gel, with a benzene-ethyl acetate mixture [9 1] as eluent) afforded the diazo ether 6.10 as a yellow oil in 17 % yield, together with 4- and 2-phenylazo-l-naphthol (6.11 and 6.12, 4% and 42%, respectively), 4-phenylbenzaldehyde (32%), benzoic acid (23%), and traces of other compounds (Scheme 6-6). Higher yields of the diazo ether (up... 

The introduction of 2-[4-(dimethylamino)phenylazo]benzoic acid into a silica sol allows the preparation of pH-sensitive doped coatings upon glass substrates. The behavior of this system was evaluated as the function of pH changes in liquid and gas media68. Optical absorption and sensitivity against pH were monitored by Vis spectroscopy. Chemical and mechanical stability tests carried out with coatings demonstrated that they were resistant enough to be use in sensor devices for pH measurements in laboratories. 

SYNS C.1.13020 C.I. ACID RED 2 p-piMETHYLAMINO)AZOBENZENE-o-CARBOXYLIC ACID 4 -DIMETHYLAMIN0AZ0BENZENE-2-CARBOXYLIC ACID o-((p-(DIMETHYLAMINO)-PHENYL)AZ0)BENZ0IC ACID 2-((4-DIMETHYL-AiMINO)PHENYLAZO)BENZOIC ACID METHYL RED... 

Colloidal silica nanoparticles of 5-15 nm functionalized on the surface either with p-CD- or with (phenylazo)benzoic acid self-assembled into large NPs when both components were mixed in water. Such severe aggregation was mediated by host-guest complexation. Deaggregation was induced by trans-to-cis azobenzene photoisomerization and cis decomplexation. 

Synonyms Alba red Cl 13058 o[p-(P,P -Dihydroxydiethylamino) phenylazo] benzoic acid Pigment red 100... 

It has been found by experiment that substances of the type RX, containing two different haptenic groups, do not form precipitates with either anti-R serum or anti-X serum Alone, but do form precipitates with a mixture of the two specific antisera. This provides proof of the effective bivalence of the dihaptenic precipitating antigen, and thus furnishes further evidence for e framework theory of antigen-antibody precipitation. In these experiments tiie anti-R serum and anti-X serum were made by injecting rabbits with sheep serum coupled with diazotized p-arsanilic add and diazotized p-aminobenzoic acid, respectively, and the RX substances used were l-amino-2-/>-(p-azophenylazo)-phenylarsonic acid-3,6-disul-fonic add 7-p-(p-azophenylazo)-benzoic acid-8-hy-droxynaphthalene and l,8-dihydroxy-2-/>-azo-phenylarsonic acid-3,6-disulfonic acid-7-p-(p-azo-phenylazo)-benzoic acid-naphthalene. 

Other Names 2-[4-(Diethylamino)phenylazo]benzoic acid Ethyl Red NSC 260474... 

Other Names Benzoic acid, <9-[[p-(dipropylamino)phenyl]azo]- 2-[4-(Dipropylamino)phenylazo] benzoic acid NSC 7803 Propyl red CA Index Name Benzoic acid, 2-[[4-(dipropylamino)phenyl]azo]-CAS Registry Number 2641-01-2 Merck Index Number Not listed Chemical Structure... 

Photoresponsive molecularly imprinted membranes are based on the ability of cis-trans isomers of the polymers which have azobenzene in their molecular structure to undergo conformational rearrangement reaction, a fact which can be speculated for controlled release applications. Two such systems were developed for the controlled release of caffeine, the first by using 4-[(4-methacryloyloxy) phenylazo]-benzoic acid as a functional monomer and trimethylolpropane trimethacrylate [63], and the second by using 4-[(4-methacryloyloxy) phenylazo] benzenesulfonic add as a functional monomer and N,N - hexylenebismethacrylamide as a crosslinker [64]. In the case of the first system, it was foimd that by irradiation at 365 nm for 120 min, 58% of the active substance is released (in the same time period, by exposine to 440 nm, 94% of the caffeine quantity is released), while for the second system, by irradiation at 353 nm for 120 min, 84% of the caffeine quantity is released (94% by irradiation at 440 nm for 90 min). 

Preparation of TMPMgCI LiCI (64) A dried and argon-flushed 2 L 5c/i/e -flask, equipped with a magnetic stirring bar and rubber septum, was charged with /-PrMgCl LiCl (1.31 M in THF, 850 mL, 1.11 mol). Then, 2,2,6,6-tetramethylpiperidine (161 g, 194 mL, 1.14 mol, 1.02 equiv.) was added at once and the mixture was stirred until gas evolution ceases (48 h). Titration with benzoic acid using 4-(phenylazo)diphenylamine as indicator prior to use showed a concentration of 1.15 M. 

Hydroxy-5-][4-[ 4-sulfophenyl)azo]pheny[ azo]benzoic acid. Mordant orange 6. C.I. 26520. 5- p p-Sulfophenylazo) phenylazo]salicylic acid. Alizarine chrome orange GR. C.I. Mordant orange 44. Eriochrome orange G. Solochrome orange RS. Wool fast orange GA-CF. Numerous other proprietary names... 

Hydroxy-7-(phenylazo)-3-sulfo-2-naphthalenyl)azo]benzoic acid, H-00459... 

Aminooxoacetic acid [(2-hydroxyphenyl) methylenejhydrazide, A-00292 8-Amino-7-(phenylazo)-5-quinolinesulfonic acid Na salt, in A-00316 7-[[5-(Aminosulfbnyl)-2-hydroxyphenyl] azo]-8-hydroxy-1,6-naphthalenedisulfonic acid, A-00349 Anthrafluorone, A-00387 Benzoic acid [(2-hydroxy-1-naphthalenyl) methylene]hydrazide, B-00064... 

PS-b-P4VP Mn of PS = 35.5K and of P4VP = 3.68K) is blended with 2-(4-hydrox5 phenylazo)benzoic acid, HABA, such that total polar component is 25.5% by mass annealing in chloroform or toluene, both selective for the PS majority component, leads to spherical morphology in swollen... 

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