Baths for distillation

The bomb is cooled, the remaining hydrogen is discharged, and the bomb is opened. The solution is transferred to a beaker, and the bomb is rinsed with a little methanol which is added to the solution. The catalyst is removed by filtration Cautionl The catalyst may be pyrophoric), and most of the filtrate is transferred to a 500-ml. Claisen flask set on a steam bath for distillation of the methanol the remainder of the filtrate is introduced into the Claisen flask when the volume of the first portion has been reduced sufficiently by distillation. After all the methanol has been removed the aminoacetal is distilled under diminished pressure. The yield of w-aminobenzaldehyde dimethylacetal, a light-yellow liquid boiling at 123-124°/4 mm. or 110-112°/l-5 mm., is 168-196 g. (67-78%). 

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