4- Methoxybenzophenone

Sodium 2-hydroxy-4-methoxybenzophenone-5-sulfonate [6628-37-1 ] M 330.3. Crystd from MeOH and dried under vacuum. 

Hydroxy- 4-methoxybenzophenone OH 0 CH.O-( )- i -(g) Substituted monohydroxy-benzophenone Negligible absorption in visible range. 

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. 

FIGURE 2.27. Redox catalysis of the reductive cleavage of 1-chloronaphthalene by the electrochemically generated anion radical of 4-methoxybenzophenone in DMSO at 0.05 V/s for excess factor of 0.5. Fitting of the experimental data points. 

Two UV filters (used to block UV-rays in sunscreens and other products), octyl-p-methoxycinnamate and octyl-dimethyl-p-aminobenzoate, reacted with chlorine, producing chlorine-substituted compounds as intermediates that finally cleaved to smaller ester products [121]. Some of the identified octyl-p-methoxycinnamate DBPs showed weak mutagenic properties. Chlorinated and brominated intermediates were formed during chlorination of 2-ethylhexyl-4-(dimethylamine)benzoate and 2-hydroxy-4-methoxybenzophenone, with trichloromethoxyphenol the most abundant DBP [122]. 

Hardacre et al. report the Friedel-Crafts benzoylation of anisole with benzoic anhydride to yield 4-methoxybenzophenone with various ILs and zeolite catalysts (USY, HZSM-5, H-beta, and H-mordenite). The rates of reaction were found to be significantly higher using ionic liquids compared with organic solvents.Continuous-flow studies of successful ionic liquid systems indicate that the bulk of the catalysis is due to the formation of an acid via the ion exchange of the cation with the protons of the zeolite as shown in the following reaction. Scheme 8. 

The formation of 4-methoxybenzophenone by the benzoylation of anisole with benzoic anhydride is shown in Scheme 4.1. 

SYNS BENZOPHENONE-3 CYASORB LW 9 2-HYDROXY-4-METHOXYBENZOPHENONE (2-HYDROXY-4-METHOXYPHENYL)PHENYLMETHAN-ONE MOB NCI-C60957 NSC-7778 OXYBENZ-ONE SPECTRA-SORB UV 9 SYNTASE 62 USAF CY-9 UVINUL M 40... 

ONE see EIDOOO 2 -CARBOXY-2- HYDROXY-4-METHOXYBENZOPHENONE(o-(2-HYDROXY-p-ANISOYL)BENZOIC ACID) see HLS500... 

Bmax maximum field. DCNB p-dicyanobenzene. TCNB 1,2,4,5-tetracyanobenzene. At 2,4,6-trimethylphenyl group. See the reference(s) cited in this column. No MFE was observed. XnC=0 xanthone. MC=0 4-methoxybenzophenone. AcC=0 acetophenone. The magnetic field dependence of the MIE was observed. 

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