... The organic layer was washed with water, dried over anhydrous sodium sulfate, and filtered through anhydrous magnesium sulfate. ... The crude product was vacuum distilled to give 1.22 g (78%) of 6 bp 68 "C (0.15 mmHg); (m, 1 HI. J. Org. Chem., Vol. 48, No. 14, 1983 2391 ...