4-(Trifluoromethyl)benzoyl chloride → 4-(Trifluoromethyl)benzaldehyde

Participants

Reaction Steps

In an apparatus as in Example 2, 100 g of 4-trifluoromethylbenzoyl chloride which had been prepared analogously to Example 1 were hydrogenated in the course of 4 hours at 90° C. in 700 ml of dry toluene with the aid of 3.5 g of Pd-carbon (Pd content: 5% by weight); the conversion was 95%. The Pd-carbon catalyst had been exposed, before the hydrogenation, for 30 minutes in toluene at the boil to a mixture containing 50% by volume each of hydrogen and carbon monoxide. By distillation it was possible to obtain 69.2 g of 4-trifluoromethylbenzaldehyde which had a boiling point of 70°-71° C./20 mbars and an nD20 of 1.4639. Yield: 83% of theory.

Provenance & Evidence