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A solution of 88.0 g of N,N-dimethylethylenediamine in 150 ml. of benzene is treated with a solution of 106 g of freshly distilled benzaldehyde in 150 ml. of benzene. This mixture is stirred and refluxed for 2 hours while collecting 22 ml. of an aqueous layer in a Dean-Stark tube. The solvent is then distilled and the residue fractionated to give 156 g of distillate, boiling point 98°-100° C. at 4 mm. of Hg.

1. temperaturerefluxed for 2 hours
2. customwhile collecting 22 ml
3. distillationThe solvent is then distilled
4. customthe residue fractionated to give 156 g of distillate, boiling point 98°-100° C. at 4 mm. of Hg