Avobenzone

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A chemical sunscreen that works by converting the energy from UV rays into a non-harmful form, such as heat. Not recommended for kids or pregnant women, as it gets absorbed into the body.

Avobenzone (Wikipedia)
Avobenzone
Skeletal formula of avobenzone
Space-filling model of the avobenzone molecule
Names
IUPAC name
1-(4-Methoxyphenyl)-3-(4-tert-butylphenyl)propane-1,3-dione
Other names
butylmethoxydibenzoylmethane; 4-tert-butyl-4'-methoxydibenzoylmethane
Identifiers
70356-09-1 YesY
ChEMBL ChEMBL1200522 N
ChemSpider 46261 YesY
EC Number 274-581-6
Jmol 3D image Interactive graph
KEGG D03015 YesY
PubChem 51040
UNII G63QQF2NOX YesY
Properties
C20H22O3
Molar mass 310.39 g/mol
Appearance colorless crystal
Supplementary data page
Refractive index (n),
Dielectric constantr), etc.
Thermodynamic
data
Phase behaviour
solid–liquid–gas
UV, IR, NMR, MS
N verify (what is YesYN ?)
Infobox references

Avobenzone (trade names Parsol 1789, Milestab 1789, Eusolex 9020, Escalol 517, Neo Heliopan 357 and others, INCI Butyl Methoxydibenzoylmethane) is an oil-soluble ingredient used in sunscreen products to absorb the full spectrum of UVA rays.

It is a dibenzoylmethane derivative. Avobenzone exists in the ground state as a mixture of the enol and keto forms, favoring the chelated enol. This enol form is stabilized by intramolecular hydrogen-bonding within the β-diketone. Its ability to absorb ultraviolet light over a wider range of wavelengths than many other sunscreen agents has led to its use in many commercial preparations marketed as "broad spectrum" sunscreens. Avobenzone has an absorption maximum of 357 nm.

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