Oxybenzone
Title: Oxybenzone
CAS Registry Number: 131-57-7
CAS Name: (2-Hydroxy-4-methoxyphenyl)phenylmethanone
Additional Names: 2-hydroxy-4-methoxybenzophenone; 4-methoxy-2-hydroxybenzophenone; benzophenone-3; MOB
Trademarks: Cyasorb UV 9 (Cytec); Eusolex 4360 (Merck KGaA); Neo Heliopan BB (Symrise); Uvinul M-40 (BASF)
Molecular Formula: C14H12O3
Molecular Weight: 228.24
Percent Composition: C 73.67%, H 5.30%, O 21.03%
Literature References: UV-A/B absorber in cosmetics and sunscreens. Prepn: König, v. Kostanecki, Ber. 39, 4027 (1906); Hardy, Forster, US 2773903 (1956 to Am. Cyanamid); Stanley et al., US 2861104; US 2861105; US 3073866 (1958, 1958, 1963 all to General Aniline & Film). Toxicity study: H. -J. Lewerenz et al., Food Cosmet. Toxicol. 10, 41 (1972).
Properties: Crystals from isopropanol, mp 66°. Readily sol in most organic solvents. LD50 orally in rats: >12.8 g/kg (Lewerenz).
Melting point: mp 66°
Toxicity data: LD50 orally in rats: >12.8 g/kg (Lewerenz)
Use: Ultraviolet light absorber and stabilizer, esp in plastics and paints.
Therap-Cat: Ultraviolet screen.
Keywords: Ultraviolet Screen.

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