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Benzoin (organic compound)

2-Hydroxy-1,2-diphenylethanone Desyl alcohol Bitter almond oil camphor | NFPA-H = 1 | NFPA-F = 1 | NFPA-R = 0 | NFPA-S =

Benzoin ( or ) is an organic compound with the formula PhCH(OH)C(O)Ph. It is a hydroxy ketone attached to two phenyl groups. It appears as off-white crystals, with a light camphor-like odor. Benzoin is synthesized from benzaldehyde in the benzoin condensation. It is chiral and it exists as a pair of enantiomers: (R)-benzoin and (S)-benzoin.

Benzoin is not a constituent of benzoin resin obtained from the benzoin tree (Styrax) or tincture of benzoin. The main component in these natural products is benzoic acid.

History

Benzoin was first reported in 1832 by Justus von Liebig and Friedrich Woehler during their research on oil of bitter almond, which is benzaldehyde with traces of hydrocyanic acid.{{cite journal | hdl-access = free | access-date = 2020-09-10 | archive-date = 2022-07-09 | archive-url = https://web.archive.org/web/20220709093441/https://zenodo.org/record/1426941 | url-status = live | access-date = 2019-06-30 | archive-date = 2022-07-09 | archive-url = https://web.archive.org/web/20220709093441/https://zenodo.org/record/1426951 | url-status = live

Uses

The main use of benzoin is as a precursor to benzil, which is used as a photoinitiator. The conversion proceeds by organic oxidation using copper(II), nitric acid, or oxone. In one study, this reaction is carried out with atmospheric oxygen and basic alumina in dichloromethane.

Benzoin also sees wide spread use in powder coating formulations, where it acts as a degassing agent during the curing stage. This action prevents surface defects such as 'pinholing'.

Benzoin can be used in the preparation of several pharmaceutical drugs including oxaprozin, ditazole, and phenytoin.

Preparation

Benzoin is prepared from benzaldehyde via the benzoin condensation. OrgSynth

References

References

  1. William M. Haynes. (2016). "CRC Handbook of Chemistry and Physics". CRC Press.
  2. Hardo Siegel, Manfred Eggersdorfer "Ketones" in Ullmann's Encyclopedia of Industrial Chemistry Wiley-VCH, 2002 by Wiley-VCH, Wienheim. {{doi. 10.1002/14356007.a15_077
  3. Nakamura, Kenichiro. (2015). "Photopolymers : photoresist materials, processes, and applications".
  4. Clarke, H. T.. (1941). "Benzil".
  5. (2006). "A very simple and chemoselective air oxidation of benzoins to benzils using alumina". [[Arkivoc]].
  6. (November 2001). "Understanding benzoin's mode of action in powder coatings". Progress in Organic Coatings.
  7. (December 2003). "Mechanism of action of benzoin as a degassing agent in powder coatings". Progress in Organic Coatings.
  8. {{US patent. 2242775
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aromatic-ketones acyloins substances-discovered-in-the-19th-century
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