Acetic Anhydride → 2-(p-Fluorobenzoyl)-3-methoxycrotononitrile

Participants

Reaction Steps

A solution containing 55.8 g. (0.34 mole) of p-fluorobenzoylacetonitrile, 41 g. (0.34 mole) of trimethyl orthoacetate, and 90 g. (0.88 mole) of acetic anhydride is heated to reflux for 5 hours. The excess solvent and volatile by-products are then removed by vacuum distillation and the residue is recrystallized from diethyl ether. Alternatively, the distillation residue may be distilled over on a Kugelrohr apparatus at 160° C./0.25 mm. to provide a viscous oil which may be crystallized from diethyl ether to provide the pure title compound.

Provenance & Evidence