Resorcinol monobenzoate

Bromoresorcinol has been prepared by the monobromination of resorcinol monobenzoate and subsequent hydrolysis, from 2-bromo-5-aminophenol by the diazo reaction, by treating resorcinol with dichlorourea and potassium bromide, and by the bromination of 2,4-dihydroxy benzoic acid followed by decarboxylation. The above procedure is based particularly upon the observations of Rice. ... 

Resorcinol monobenzoate Benzoate Converted in sunlight to a dihydroxybenzophenone. Used in cellulosics. 

Further improvement in light stability may be achieved by addition of small quantities of ultraviolet absorbers. Typical examples include phenyl salicylate, 2,4-dihydroxybenzophenone, resorcinol monobenzoate, methyl salicylate and stilbene. 

UV absorbers have been found to be quite effective for stabilization of polymers and are very much in demand. They function by the absorption and harmless dissipation of the sunlight or UV-rich artificial radiation, which would have otherwise initiated degradation of a polymer material. Meyer and Geurhart reported, for the first time in 1945 [10], the use of UV absorber in a polymer. They found that the outdoor life of cellulose acetate film was greatly prolonged by adding phenyl salicylate (salol) [10]. After that, resorcinol monobenzoate, a much more effective absorber, was introduced in 1951 [11] for stabilization of PP, but salol continued to be the only important commercial stabilizer for several years. The 2,4-dihydroxybenzophenone was marketed in 1953, followed shortly by 2-hydroxy-4-methoxybenzophenone and other derivatives. Of the more commonly known UV absorbers, the 2-hydroxybenzophenones, 2-hy-droxy-phenyl-triazines, derivatives of phenol salicylates, its metal chelates, and hindered amine light stabilizers (HALS) are widely used in the polymer industry. 

BHA, BHT, PG, TBHQ and tocopherols) a variety of stationary phases, mobile phases and detectors can be used [711]. Common antibacterials such as carba-dox, thiamphenicol, furazolidone, oxolinic acid, sul-fadimethoxine, sulfaquinoxaline, nalidixic and piromidic acid can be analysed by GE-RPLC-UV (at 254 nm). Collaborative studies have been reported for the HPLC determination of the antimicrobial sodium benzoate in aqueous solutions [712], Plastics devices used for field collection of water samples may contain polymer additives (such as resorcinol monobenzoate, 2,4-dihydroxybenzophenone or bisphenol A) or cyanobac-terial microcystins [713],... 

As the majority of stabilisers has the structure of aromatics, which are UV-active and show a distinct UV spectrum, UV spectrophotometry is a very efficient analytical method for qualitative and quantitative analysis of stabilisers and similar substances in polymers. For UV absorbers, UV detection (before and after chromatographic separation) is an appropriate analytical tool. Haslam et al. [30] have used UV spectroscopy for the quantitative determination of UVAs (methyl salicylate, phenyl salicylate, DHB, stilbene and resorcinol monobenzoate) and plasticisers (DBP) in PMMA and methyl methacrylate-ethyl acrylate copolymers. From the intensity ratio... 

With this purpose, several different types of solid acid catalysts have been investigated for the acylation of aromatics, but the best performances have been obtained with medium-pore and large-pore zeolites (3-9). In general, however, the use of acylating agents other then halides, e.g., anhydrides or acids, is limited to the transformation of aromatic substrates highly activated towards electrophilic substitution. In a previous work (10), we investigated the benzoylation of resorcinol (1,3-dihydroxybenzene), catalyzed by acid clays. It was found that the reaction mechanism consists of the direct 0-benzoylation with formation of resorcinol monobenzoate, while no primary formation of the product of C-benzoylation (2,4-dihydroxybenzophenone) occurred. The latter product formed exclusively by... 

The benzoylation of resorcinol to produce 2,4-dihydroxybenzo-phenone has been previously performed with benzotrichloride, which implies the coproduction of 3 mol of hydrochloric acid and consequently a large amounts of acid waste. " Alternative routes to 2,4-dihydroxyben-zophenone involve direct acylation of resorcinol with benzoyl chloride (BC) or the Hoesch reaction with benzonitrile, which also suffer from acid waste production. In a more ecoefficient approach, the reaction was performed with benzoic acid (BAC) in the presence of some solid catalysts, with a special focus on BEA zeolite (Scheme 5.9). The progress of the reaction in para-chlorotoluene is examined, and after 18 h, 2,4-dihy-droxybenzophenone (2,4-DHB) is isolated in 70% yield, together with 20% of resorcinol monobenzoate (RMB), 3% of resorcinol dibenzoate, 5% of BAC, and 2% of resorcinol. The fact that the concentration of resorcinol in the final mixture is somewhat lower than that of BAC is probably due to the preferred adsorption of the former. The process is then studied by using different substituted BACs the different conversions of 2-methyl-,... 

Bolognini, M., Cavani, F, Cimini, M., Dal Pozzo, L., Maselli, L., Venerito, D., Pizzoli, F, and Veronesi, G. 2004. An environmentally friendly s)mthesis of 2,4-dihydroxybenzophenone by the single-step O-mono-benzoylation of 1,3-dihydroxybenzene (resorcinol) and Fries rearrangement of intermediate resorcinol monobenzoate the activity of acid-treated montmorillonite clay catalysts. C. R. Chim. 7 143-150. 

Beilstein Handbook Reference) 1,3-Benzenediol, monobenzoate Benzoic acid, m-hydroxyphenyl ester BRN 1873897 Eastman Inhibitor RMB EINECS 205-241-7 3-Hydroxyphenyl benzoate NSC 4807 Resorcinol monobenzoate. Industrial grade UV absorber/stabilizer for cellulosic plastics and PVC formulations. White crystalline solid mp = 133-135" insoluble in H2O, CeHe, soluble in EtOH, MezCO LDso (rat orl) = 1600 mg/kg. Eastman Chem. Co Monomer -Polymer Dajac. 

RMB resorcinol monobenzoate RTPO reactor-made thermoplastic polyolefin... 

Benzoic acid, m-hydroxyphenyl ester 3-Hydroxyphenyl benzoate Resorcinol, monobenzoate... 

Resorcinol monobenzoate n. A white, crystalline solid used as an ultraviolet screener in plastics. It is particularly useful in applications requiring a high degree of transparency, and can be used with cellulosics, vinyls, and certain polyesters See image). 

UV stabilizers (particularly the hydroxybenzophenones and the hydroxybenzotriazoles). Also, blend ABS with PVC or cap the ABS part with a stable film like acrylic. Some hindered amines are also being used especially in blends with absorber systems Absorbers, quenchers and HALS are used, but only absorbers are recommended for protecting whatever is underneath an acrylic substrate Aryl esters (resorcinol monobenzoate). Also salicylates, hindered amines, then benzophenones, and the benzotriazoles... 

Contact allergies to UV-light absorbers like 2-hydroxybenzophenone, resorcinol monobenzoate, 2-(2-hydroxy-5-methylphenyl)benzotriazole (Tinuvin P) and bis-(2,2,6,6)-tetramethyl-4-piperidyl-sebacate have been encountered [14-16]. Organic pigments, mostly of the azo types, are potentially sensitizing additives in plastics [17,18]. 

Chemical cellulose esters are relatively stable to UV radiation since they lack aromatic chromophores. Even so, exposure to UV radiation may cause some chain scission and loss of physical properties in cellulose esters exposed to outdoor environments esters formulated for such use must be stabilized accordingly. Some resorcinol and benzophenone derivatives, such as resorcinol monobenzoate and 2-hydroxy-4-methoxybenzophenone, are reportedly excellent UV-light stabilizers for cellulose esters (56,57). Other stabilizers include piperidine derivatives (58) and substituted triazole compounds alone (59) and in combination with resorcinol monobenzoate (60). 

With para-chlorotoluene as solvent, after 18 h 2,4-dihydroxybenzophenone (26) is isolated in 70% yield, together with 20% of resorcinol monobenzoate (27) and 3% of resorcinol dibenzoate. 

Also obtained by photo-Fries rearrangement of resorcinol monobenzoate [219], Preparation by reaction of di(carbomethoxy)-P-resorcylic acid chloride with benzene in the presence of aluminium chloride at 60-70° for 1 h, then at 80° for 1 h (70%) [220],... 

Cinnamate derivatives Resorcinol monobenzoates Oxanilides p-hydroxybenzoates... 

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