Lilial

Lilial (a trade name for lily aldehyde, also known as lysmeral) is a chemical compound commonly used as a perfume in cosmetic preparations and laundry powders, often under the name butylphenyl methylpropional. It is a synthetic aromatic aldehyde.

Lilial
Names
IUPAC name
3-(4-tert-Butylphenyl)-2-methylpropanal
Other names
  • 4-tert-Butyl-α-methyl-benzenepropanal
  • 4-tert-Butyl-α-methyl-hydrocinnamaldehyde
  • Butylphenyl methylpropional
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.001.173
EC Number
  • 201-289-8
RTECS number
  • MW4895000
UNII
UN number 3082
Properties
C14H20O
Molar mass 204.313 g·mol−1
Appearance Clear viscous liquid
Density 0.94 g/ml
Melting point −20 °C (−4 °F; 253 K)
Boiling point 275 °C (527 °F; 548 K)[1]
0.045 g/l at 20 °C
log P 4.36 [1]
Pharmacology
Topical
Related compounds
Related aldehydes
 Bourgeonal

Isobutyraldehyde
Hexyl cinnamaldehyde
2-Methylundecanal

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Synthesis

Lilial is produced at BASF through a double anodic oxidation of 4-tert-butyl toluene on >10,000 ton per year scale.[2]

Properties

Lilial is commonly produced and sold as a racemic mixture; however, testing has indicated that the different enantiomers of the compound do not contribute equally to its odor. The (R)-enantiomer has a strong floral odor, reminiscent of cyclamen or lily of the valley; whereas the (S)-enantiomer possesses no strong odor.[3]

(R)-Lilial (top) and (S)-lilial

Like most aldehydes, lilial is not long term stable and tends to slowly oxidize on storage.

Safety

The Scientific Committee on Consumer Safety (SCCS, scientific committee for consumer safety of the EU Commission) concluded in May 2019 that the use of lilial in both rinse-off and leave-on cosmetics "cannot be considered as safe". [4]

It can sometimes act as an allergen and may cause contact dermatitis in susceptible individuals.

See also

References
  1. Haefliger, Olivier P.; Jeckelmann, Nicolas; Ouali, Lahoussine; León, Géraldine (2010). "Real-Time Monitoring of Fragrance Release from Cotton Towels by Low Thermal Mass Gas Chromatography Using a Longitudinally Modulating Cryogenic System for Headspace Sampling and Injection". Analytical Chemistry. 82 (2): 729–737. doi:10.1021/ac902460d. ISSN 0003-2700. PMID 20025230.
  2. Möhle, S.; Zirbes, M.; Rodrigo, E.; Gieshoff, T.; Wiebe, A.; Waldvogel, S. R. Modern Electrochemical Aspects for the Synthesis of Value-Added Organic Products. Angew. Chem., Int. Ed. 2018, 57, 6018−6041
  3. Bartschat, Dietmar; Bürner, Susanne; Mosandl, A.; Bats, Jan W. (1997). "Stereoisomeric flavour compounds LXXVI: direct enantioseparation, structure elucidation and structure-function relationship of 4-tert-butyl-α-methyldihydrocinnamaldehyde". Zeitschrift für Lebensmitteluntersuchung und -Forschung A. 205 (1): 76–79. doi:10.1007/s002170050127. ISSN 1431-4649. S2CID 97399242.
  4. Scientific Committee on Consumer Safety (2019-05-10). "OPINION ON the safety of Butylphenyl methylpropional (p-BMHCA) in cosmetic products" (PDF). Retrieved 2020-05-28. On individual product basis, Butylphenyl methylpropional (p-BMHCA) (CAS 80-54-6) with alpha-tocopherol at 200 ppm, can be considered safe when used as fragrance ingredient in different cosmetic leave-on and rinse-off type products. However, considering the first-tier deterministic aggregate exposure, arising from the use of different product types together, Butylphenyl methylpropional at the proposed concentrations cannot be considered as safe.
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