3,5-Dimethoxybenzoic Acid → 3,5-Dimethoxybenzoyl chloride

Participants

Reaction Steps

72.9 g of 3,5-dimethoxybenzoic acid are suspended in 320 ml of toluene, and 2 drops of dimethylformamide are added thereto. The suspension is heated to 50°. 40 ml of thionyl chloride are added dropwise at that temperature within a period of 10 minutes. The whole is then heated to 90° (vigorous evolution of gas) and stirred for 2 hours. The reaction mixture is cooled and concentrated by evaporation in a rotary evaporator. After the addition of toluene, the whole is again concentrated by evaporation. The oily residue is dried for 15 minutes under a high vacuum. 3,5-dimethoxybenzoyl chloride is thus obtained.

Provenance & Evidence