Thionyl Chloride → 2,4-Dichloro-3-methoxycarbonylbenzoylchloride

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Reaction Steps

2,4-Dichloro-3-methoxycarbonylbenzoic acid (32.37 g) and thionyl chloride (100 ml) was heated under reflux with stirring for 3 hours. The mixture was cooled and evaporated in vacuo, then re-evaporated after addition of toluene to give 2,4-dichloro-3-methoxycarbonylbenzoyl chloride (34.76 g) as a dark brown oil. This was used in the next stage without purification.

Provenance & Evidence