Title: Dioxybenzone
CAS Registry Number: 131-53-3
CAS Name: (2-Hydroxy-4-methoxyphenyl)(2-hydroxyphenyl)methanone
Additional Names: 2,2¢-dihydroxy-4-methoxybenzophenone; 4-methoxy-2,2¢-dihydroxybenzophenone; benzophenone-8
Trademarks: Cyasorb UV 24 (obsolete) (Am. Cyanamid); Spectra-Sorb UV 24 (Am. Cyanamid)
Molecular Formula: C14H12O4
Molecular Weight: 244.24
Percent Composition: C 68.85%, H 4.95%, O 26.20%
Literature References: Prepn: Hardy et al., US 2853521 (1958 to Am. Cyanamid).
Properties: Yellow powder, mp 68°. Soly in g/100 ml at 25°: ethanol 21.8; isopropanol 17; propylene glycol 6.2; ethylene glycol 3.0; n-hexane 1.5.
Melting point: mp 68°
Therap-Cat: Ultraviolet screen.
Keywords: Ultraviolet Screen.
Dioxypyramidon Diperodon Hydrochloride Diphacinone Diphemanil Methylsulfate Diphemethoxidine

CAS number 131-53-3 YesY
PubChem 8569
ChemSpider 8251 YesY
KEGG D03853 YesY
Jmol-3D images Image 1
Image 2
Molecular formula C14H12O4
Molar mass 244.25 g/mol
Density 1.38 g/cm3
Melting point 68 °C
Boiling point 170–175 °C
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Dioxybenzone (benzophenone-8) is an organic compound used in sunscreen to block UVB and short-wave UVA (ultraviolet) rays.[2] It is a derivative of benzophenone. It is a yellow powder with a melting point of 68 °C. It is insoluble in water, but moderately soluble in ethanol and isopropanol.