Benzyl benzoate

Benzyl benzoate, sold under the brand name Scabanca among others, is a medication and insect repellent.[1] As a medication it is used to treat scabies and lice.[2] For scabies either permethrin or malathion is typically preferred.[3] It is applied to the skin as a lotion.[2] Typically two to three applications are needed.[2]

Benzyl benzoate
Clinical data
Trade namesAscabin, Ascabiol, Ascarbin, Tenutex, others
Other namesbenzoic acid phenylmethyl ester, benzy alcohol benzoic ester
ATC code
Identifiers
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.004.003
Chemical and physical data
FormulaC14H12O2
Molar mass212.248 g·mol−1
3D model (JSmol)
Density1.118 g/cm3 g/cm3
Melting point18 °C (64 °F)
Boiling point323 °C (613 °F)
Solubility in waterinsoluble mg/mL (20 °C)

Side effects may include irritation of the skin.[2] It is not recommended in children.[3] It is also used in other animals; however, it is considered toxic to cats.[1] How it works is unclear.[4]

Benzyl benzoate was first studied medically in 1918.[1] It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system.[5] Benzyl benzoate is available as a generic medication.[3] The wholesale cost in the developing world is about US$0.21–0.53 per 100 mL.[6] It is not available for medical use in the United States.[1] In the United Kingdom it costs the NHS about £2.50 for 500 mL.[3]

Uses

Medical

Benzyl benzoate is an effective and inexpensive topical treatment for human scabies.[7] It has vasodilating and spasmolytic effects and is present in many asthma and whooping cough drugs.[8] It is also used as an excipient in some testosterone-replacement medications (like Nebido) for treating hypogonadism.[9]

Benzyl benzoate is used as a topical acaricide, scabicide, and pediculicide in veterinary hospitals.[10]

Non-medical

Benzyl benzoate is used as a repellent for chiggers, ticks, and mosquitoes.[10] It is also used as a dye carrier, solvent for cellulose derivatives, plasticizer, and fixative in the perfume industry.[11]

Side effects

Benzyl benzoate has low acute toxicity in laboratory animals. It is rapidly hydrolyzed to benzoic acid and benzyl alcohol. Benzyl alcohol is subsequently metabolized to benzoic acid. The conjugates of benzoic acid (hippuric acid and the glucuronide of benzoic acid) are rapidly eliminated in urine.[1] When given in large doses to laboratory animals, benzyl benzoate can cause hyperexcitation, loss of coordination, ataxia, convulsions, and respiratory paralysis.[10]

Benzyl benzoate can be a skin irritant when used as a topical scabicide.[7] Overdose can result in blistering and hives or a rash can occur as an allergic reaction.[12][13]

As an excipient in some testosterone-replacement injectable medications, benzyl benzoate has been reported as a cause of anaphylaxis in a case in Australia.[14] Bayer includes this report in information for health professionals and recommends that physicians "should be aware of the potential for serious allergic reactions" to preparations of this type.[9] In Australia, reports to ADRAC, which evaluates reports of adverse drug reactions for the Therapeutic Goods Administration, show several reports of allergic issues since the anaphylaxis case from 2011.

Chemistry

It is an organic compound with the formula C6H5CH2O2CC6H5. It is the ester of benzyl alcohol and benzoic acid. It forms either a viscous liquid or solid flakes and has a weak, sweet-balsamic odor. It occurs in a number of blossoms (e. g. tuberose, hyacinth) and is a component of Balsam of Peru and Tolu balsam.[11][15]

Production

Benzyl benzoate is produced industrially by the reaction of sodium benzoate with benzyl alcohol in the presence of a base, or by transesterification of methyl benzoate and benzyl alcohol.[8] It is a byproduct of benzoic acid synthesis by toluene oxidation.[11] It can also be synthesized by the Tishchenko reaction, using benzaldehyde with sodium benzylate (generated from sodium and benzyl alcohol) as catalyst:[16][17]

References
  1. Knowles, Charles O. (1991). "22.4.2 Benzyl Benzoate". In Hayes, Wayland J.; Laws, Edward R. (eds.). Handbook of Pesticide Toxicology, Volume 3: Classes of Pesticides. Academic Press. pp. 1505–1508. ISBN 0123341639.
  2. WHO Model Formulary 2008 (PDF). World Health Organization. 2009. p. 311. ISBN 9789241547659. Archived (PDF) from the original on 13 December 2016. Retrieved 8 December 2016.
  3. British national formulary : BNF 69 (69 ed.). British Medical Association. 2015. p. 836. ISBN 9780857111562.
  4. Bowman, Dwight D. (2009). Georgis' Parasitology for Veterinarians. Elsevier Health Sciences. p. 262. ISBN 978-1416044123.
  5. "WHO Model List of Essential Medicines (19th List)" (PDF). World Health Organization. April 2015. Archived (PDF) from the original on 13 December 2016. Retrieved 8 December 2016.
  6. "Benzyl Benzoate". International Drug Price Indicator Guide. Retrieved 8 December 2016.
  7. D.A. Burns (2010), "Diseases Caused by Arthropods and Other Noxious Animals", in Tony Burns; et al. (eds.), Rook's Textbook of Dermatology, 2 (8th ed.), Wiley-Blackwell, p. 38.41
  8. Brühne, Friedrich; Wright, Elaine (15 June 2000). "Benzyl Alcohol". Ullmann's Encyclopedia of Industrial Chemistry. Wiley. doi:10.1002/14356007.a04_001. ISBN 3527306730.
  9. "Nebido Monograph – Information for Health Care Professionls". Bayer. 2016. Archived from the original on 19 October 2016. Retrieved 19 October 2016.
  10. Shaikh, Jamaluddin (2005). "Benzyl Benzoate". In Wexler, Philip (ed.). Encyclopedia of Toxicology. 1 (2nd ed.). Elsevier. pp. 264–265.
  11. Maki, Takao; Takeda, Kazuo (15 June 2000). "Benzoic Acid and Derivatives". Ullmann's Encyclopedia of Industrial Chemistry. Wiley. doi:10.1002/14356007.a03_555. ISBN 3527306730.
  12. "Benzyl Benzoate (Topical route)". PubMed Health at the United States National Library of Medicine. 1 October 2016. Archived from the original on 10 September 2017. Retrieved 19 October 2016.
  13. "Benzocaine-Benzyl Benzoate Topical: Side Effects". WebMD. 2016. Archived from the original on 19 October 2016. Retrieved 19 October 2016.
  14. Ong, G. S. Y.; Somerville, C. P.; Jones, T. W.; Walsh, J. P. (2012). "Anaphylaxis Triggered by Benzyl Benzoate in a Preparation of Depot Testosterone Undecanoate". Case Rep Med. 2012: 1–3. doi:10.1155/2012/384054. PMC 3261473. PMID 22272209. 384054.
  15. Fahlbusch, Karl-Georg; Hammerschmidt, Franz‐Josef; Panten, Johannes; Pickenhagen, Wilhelm; Schatkowski, Dietmar; Bauer, Kurt; Garbe, Dorothea; Surburg, Horst (15 January 2003). "Flavors and Fragrances". Ullmann's Encyclopedia of Industrial Chemistry. Wiley. doi:10.1002/14356007.a11_141. ISBN 3527306730.
  16. Brühne, Friedrich; Wright, Elaine (15 October 2011). "Benzaldehyde". Ullmann's Encyclopedia of Industrial Chemistry. Wiley. doi:10.1002/14356007.a03_463.pub2. ISBN 978-3527306732.
  17. Kamm, O.; Kamm, W. F. (1922). "Benzyl benzoate". Organic Syntheses. 2: 5. doi:10.15227/orgsyn.002.0005.; Collective Volume, 1, p. 104

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