Benzyl cyanide

Preparation

Benzyl cyanide can be produced via Kolbe nitrile synthesis between benzyl chloride and sodium cyanide and by oxidative decarboxylation of phenylalanine.

Benzyl cyanides can also be prepared by arylation of silyl-substituted acetonitrile.

Reactions

Benzyl cyanide undergoes many reactions characteristic of nitriles. It can be hydrolyzed to give phenylacetic acid or it can be used in the Pinner reaction to yield phenylacetic acid esters. Hydrogenation gives β-phenethylamine.

The compound contains an "active methylene unit". Bromination occurs gives PhCHBrCN. A variety of base-induced reactions result in the formation of new carbon-carbon bonds.

Uses

Benzyl cyanide is used as a solvent and as a starting material in the synthesis of fungicides (e.g. Fenapanil), fragrances (phenethyl alcohol), antibiotics,

Pharmaceuticals

Benzyl cyanide is a useful precursor to numerous pharmaceuticals. Examples include:

• Antiarrhythmics (e.g. disopyramide)
• Antidepressants: E.g. Milnacipran & Lomevactone
• Antihistamines (e.g. levocabastine (para-fluoro), Pheniramine & Azatadine.
• Antitussives (e.g. isoaminile, oxeladin, butethamate, pentapiperide, and pentoxyverine)
• Diuretics (e.g. triamterene)
• Hypnotics (e.g. alonimid and phenobarbital) & Phenglutarimide
• Spasmolytics (e.g. pentapiperide and drofenine)
• Stimulants (e.g. methylphenidate), mazindol & gamfexine.
• Opioids (e.g. ethoheptazine, pethidine, and phenoperidine) & methadone
• SERMs, e.g. Triphenylacrylonitrile [6304-33-2] (aka "TPAN")

Regulation

Because benzyl cyanide is a useful precursor to numerous drugs with recreational use potential, many countries strictly regulate the compound.

United States

Benzyl cyanide is regulated in the United States as a DEA List I chemical.

China

Benzyl cyanide is regulated in People's Republic of China as a Class III drug precursor since 7 June 2021.

Safety

Benzyl cyanide, like related benzyl derivatives, is an irritant to the skin and eyes.

References

References

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