2-Hydroxy-4-methoxy benzophenone

Nonloaded and loaded SLN were already investigated with respect to use in cosmetics. Although adequate controls are difficult to prepare, first experiments indicate an increase in skin hydration and a reduction in wrinkle depth following SLN application [68]. Moreover, cetyl palmitate-nanodispersions act both as particulate ultraviolet (UV) blockers themselves and as carriers for UV absorbing agents (e.g., 2-hydroxy-4-methoxy benzophenone Eusolex 4360). This results in a threefold... 

Very early in the study of photosensitization it was discovered that salicylaldehyde, 2,4-dihydroxybenzophenone, and 2-hydroxy-4-methoxy-benzophenone do not sensitize piperylene isomerization, indicating that enolization is much faster than quenching by the diene.37 Later it was shown that 2-hydroxybenzophenone would sensitize the dimerization of isoprene in concentrated solution, but that the reaction was much less efficient than when benzophenone was used as a sensitizer (Table I).36... 

Exposure to VOCs in public beauty shops can also be high. Many cosmetic products contain VOCs such as 2-phenoxyethanol, 2-butanone, acetone, terpenes, 2-hydroxy-4-methoxy-benzophenone or phenylmethanol. In particular, hair sprays are potential sources of indoor pollutants. To estimate VOC concentrations associated with the use of beauty products, a female subject was placed in the model room described earlier and sprayed with 16.1 g hair lacquer. Propellant gases (butane, pentane), ethanol, limonene and tripropyleneglycol (isomers) were subsequently monitored in the room. Thirty minutes after the application of this product, the highest VOC concentrations were measured for ethanol (>100pg/m3)... 

Yesudian, P.D. and King, C.M., Severe contact urticaria and anaphylaxis from benzophenone-3 (2-hydroxy 4-methoxy benzophenone), Contact Dermatitis, 46, 55, 2002. 

The best known and most commonly used ingredients of UV filters are compounds from the group of benzophenones (BPs), mainly 2,4-dihydroxybenzophenone (BP-1) and 2-hydroxy,4-methoxy benzophenone (BP-3). Their structures are depicted in Figs. 7.6 and 7.7. 

SYN 2 -CARBOXY-2-HYDROXY-4-METHOXY-BENZOPHENONE(o-(2-H T)ROXY-p-ANISOYL)BENZ-OIC ACID)... 

The protective ability of orthohydroxylated benzophenones is well known. They can act as U.V.absorbers, i.d optical screeners or as quenchers with some polymers such as polystyrene (12). We have synthesized a polymer containing such structures tFe poly (4-vinyl 2 -hydroxy 4 -methoxy benzophenone) (Poly-5) (13,14). In... 

PhotoFries Rearrangement Of Poly (4-vinyl 3 -methoxv phenvl benzoate). Unit structures obtained in this reaction are those of the poly (4-vinyl 2 -hydroxy 4 -methoxy benzophenone) (Poly-5) and poly (4-vinyl 4 -hydroxy 2 -methoxy benzophenone) described in Figure II. For spectroscopic caracteristies we have compared the para-hydroxy derivative to poly (4-vinyl 2, 4 -dimethoxy ben-zophenone)(Poly-10) which is an intermediary in the synthesis of Poly-5 (13). Here too, absorption of the reaction products in the range of 100-360 nm were sufficient to estimate the ortho/para rearrangements ratio. The ultraviolet caracteristies of Poly-7, Poly-5, Poly-10 and results of irradiations of Poly-7 are listed in Tables VIII and IX. In the same conditions of irradiations, ortho/para ratio and yields are smaller than the values obtained in the case of Poly-6. But, as in the previous case, benzophenones are obtained very rapidly and the ortho product formation is greater than the para one. It is thus possible to consider poly (4-vinyl phenyl benzoates) as U.V. protectors. 

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. 

Anti UVA. [Aceto] 2-Hydroxy-4-methoxy benzophenone sunscreen agent... 

DeTinition Sodium salt of 2-hydroxy-4-methoxy benzophenone-5-sulfonic... 

A UV-A and UV-B sunscreen product whose active ingredients are octyl 4-methoxycinnamate and 2-hydroxy-4-methoxy-benzophenone (oxybenzone). 

Hydroxy-4-methoxy-benzophenon-5-sulfonic acid Sulizobenzone, Uvinyl MS 40, Benzophenone 4... 

Obtained by adding a 21% solution of formaldehyde to a solution of 2-hydroxy-4-methoxy-benzophenone in aqueous sodium hydroxide and tetrahydrofuran then stirring the mixture at r.t. for 5.5 h (31%) [795,796]. 

Preparation by treatment of 2-hydroxy-4 -methoxy-benzophenone at 120° with a mixture of isobutylene/nitrogen (1 1) in the presence of a macroreticular acid ion exchanger (Wofatit OK 80) as catalyst for 10 h (85%) [819]. 

Obtained by reaction of 2-hydroxy-4-methoxy-benzophenone with lead tetraacetate in acetic acid at 100 for 5 h (15%). The same reaction using manganic acetate gave 7% yield [650],... 

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