Diethylamino hydroxybenzoyl hexyl benzoate

Diethylamino hydroxybenzoyl hexyl benzoate (INCI) is an organic compound used in sunscreens to absorb UVA radiation. It is marketed as Parsol DHHB by DSM and as Uvinul A Plus by BASF. DHHB has an absorption maximum of 354 nm.^[1][2] DHHB has excellent photostability and compatibility with other UV absorbers and other cosmetic ingredients.^[3]

Diethylamino hydroxybenzoyl hexyl benzoate

Names
Preferred IUPAC name Hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate
Other names Uvinul A Plus
Identifiers
CAS Number	302776-68-7 Y
3D model (JSmol)	Interactive image
ChemSpider	8286957 Y
ECHA InfoCard	100.103.916
PubChem CID	10111431
UNII	ANQ870JD20
CompTox Dashboard (EPA)	DTXSID60184370
InChI InChI=1S/C24H31NO4/c1-4-7-8-11-16-29-24(28)20-13-10-9-12-19(20)23(27)21-15-14-18(17-22(21)26)25(5-2)6-3/h9-10,12-15,17,26H,4-8,11,16H2,1-3H3 Y Key: FDATWRLUYRHCJE-UHFFFAOYSA-N Y InChI=1/C24H31NO4/c1-4-7-8-11-16-29-24(28)20-13-10-9-12-19(20)23(27)21-15-14-18(17-22(21)26)25(5-2)6-3/h9-10,12-15,17,26H,4-8,11,16H2,1-3H3 Key: FDATWRLUYRHCJE-UHFFFAOYAR
SMILES CCCCCCOC(=O)C1=CC=CC=C1C(=O)C2=C(C(=CC=C2)N(CC)CC)O
Properties
Chemical formula	C24H31NO4
Molar mass	397.515 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

The European Commission Scientific Committee on Consumer Safety (SCCS) has expressed concerns about di-n-hexyl phthalate contamination from manufacture and recommended a maximum safe level of 260 parts per million in DHHB for suncreams. They further recommended that a trace level below 1 ppm should be the target for manufacturers as the contamination is avoidable.^[4] Although DHHB is a safe sunscreen ingredient, di-n-hexyl phtalate has been on the European Chemicals Agency list of Substances of Very High Concern since 2013.^[5]

Synthesis

DHHB is produced by a reaction between 3-hydroxy-N,N-diethylaniline and phthalic anhydride, followed by esterification with 1-hexanol.

Regulation

DHHB has been approved for the use in sunscreens in the European Union since 2005 with a maximum concentration of 10%^[6][7] and is also approved in South America, Mexico, Japan and Taiwan.^[8] In the United States it can be used for product protection.^[9]