Methyl benzoate

Structure and physical properties

The molecule consists of a benzene ring bound to a carbonyl group that is esterified with a methyl group. This arrangement gives the compound moderate polarity compared with hydrocarbons and a characteristic scent. The ester functional group is responsible for many of its reactivity patterns in laboratory transformations; for reference to spectroscopic and structural summaries see compound listings.

Preparation and history

Methyl benzoate is typically prepared by esterifying benzoic acid with methanol under acidic conditions (a Fischer esterification) or by methylation of benzoate salts. The compound and related benzoate esters have long been recognized for their pleasant aromas and were adopted into perfumery and flavor chemistry as synthetic ingredients once practical production methods became available in the 19th and 20th centuries.

Uses and occurrence

Methyl benzoate has several commercial and natural roles. It is used as an ingredient in fragrances and flavor formulations, as a solvent or intermediate in organic synthesis, and as a standard or reference in analytical chemistry. It also occurs naturally in the essential oils of some flowers and fruits and contributes to their scent. Examples of applications include:

• Fragrance and flavor formulations for a floral or fruity note.
• Intermediate in organic reactions where an ester functional group is required.
• Attractant in some insect monitoring and ecological studies because certain pollinators respond to benzoate esters.

Safety and notable distinctions

Like many organic esters, methyl benzoate should be handled with standard laboratory precautions: avoid inhalation and prolonged skin contact, use in a ventilated area, and store away from strong oxidizers and open flame. It differs from benzoic acid (the parent acid) in being less polar and more volatile, and it should not be confused with other benzoate esters that vary in odor and volatility depending on their alkyl group.