Benzyl benzoate

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Benzyl benzoate
Benzyl benzoate structure.svg
Benzyl benzoate ball-and-stick.png
Clinical data
Trade names Ascabin, Ascabiol, Ascarbin, Tenutex, others
ATC code
Identifiers
Synonyms benzoic acid phenylmethyl ester, benzy alcohol benzoic ester
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
ECHA InfoCard 100.004.003
Chemical and physical data
Formula C14H12O2
Molar mass 212.25 g·mol−1
3D model (Jmol)
Density 1.118 g/cm3 g/cm3
Melting point 18 °C (64 °F)
Boiling point 323 °C (613 °F)
Solubility in water insoluble mg/mL (20 °C)

Benzyl benzoate (BnBzO), sold under the brand name Scabanca among others, is a medication and insect repellant.[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. Typically two to three applications are needed.[2]

Side effects may include irritation of the skin.[2] It is not recommended in children.[3] It is also used in other animals; however, is 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 important medication needeIt 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 0.21 to 0.53 USD per 100 mls.[6] It is not available for medical use in the United States.[1] In the United Kingdom it costs the NHS about 2.50 pounds for 500 mLs.[3]

Uses[edit]

Medical[edit]

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[edit]

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[edit]

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 are rapidly eliminated in urine. 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[edit]

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[edit]

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]

The Tishchenko reaction: benzaldehyde reacts to benzyl benzoate, the catalyst is generated in situ from sodium and benzyl alcohol

References[edit]

  1. ^ a b c d Jr, Wayland J. Hayes (2013). Classes of Pesticides. Elsevier. pp. 1505–6. ISBN 9781483288635. 
  2. ^ a b c WHO Model Formulary 2008 (PDF). World Health Organization. 2009. p. 311. ISBN 9789241547659. Retrieved 8 December 2016. 
  3. ^ a b c d 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 1416044124. 
  5. ^ "WHO Model List of Essential Medicines (19th List)" (PDF). World Health Organization. April 2015. Retrieved 8 December 2016. 
  6. ^ "Benzyl Benzoate". International Drug Price Indicator Guide. Retrieved 8 December 2016. 
  7. ^ a b D.A. Burns (2010), "Diseases Caused by Arthropods and Other Noxious Animals", in Tony Burns; et al., Rook's Textbook of Dermatology, 2 (8th ed.), Wiley-Blackwell, p. 38.41 
  8. ^ a b Friedrich Brühne, Elaine Wright (2007), "Benzyl Alcohol", Ullmann's Encyclopedia of Industrial Chemistry (7th ed.), Wiley, p. 7 
  9. ^ a b "Nebido Monograph – Information for Health Care Professionls". Bayer. 2016. Retrieved 19 October 2016. 
  10. ^ a b c Jamaluddin Shaikh (2005), "Benzyl Benzoate", in Philip Wexler, Encyclopedia of Toxicology, 1 (2nd ed.), Elsevier, pp. 264–265 
  11. ^ a b c Takao Maki; et al. (2007), "Benzoic Acid and Derivatives", Ullman's Encyclopedia of Industrial Chemistry (7th ed.), Wiley, p. 6 
  12. ^ "Benzyl Benzoate (Topical route)". PubMed Health at the United States National Library of Medicine. October 1, 2016. Retrieved October 19, 2016. 
  13. ^ "Benzocaine-Benzyl Benzoate Topical: Side Effects". WebMD. 2016. Retrieved October 19, 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. doi:10.1155/2012/384054. PMC 3261473Freely accessible. PMID 22272209. 384054. 
  15. ^ Karl-Georg Fahlbusch; et al. (2007), "Flavors and Fragrances", Ullman's Encyclopedia of Industrial Chemistry (7th ed.), Wiley, p. 59 
  16. ^ Friedrich Brühne, Elaine Wright (2007), "Benzaldehyde", Ullmann's Encyclopedia of Industrial Chemistry (7th ed.), Wiley, p. 3 
  17. ^ Kamm, O.; Kamm, W. F. (1941). "Benzyl benzoate". Org. Synth.  ; Coll. Vol., 1, p. 104