... The ethereal solution was then dried (Na,S04) and the ether removed on a water bath. The residual oil was distilled in uucuo to give the isomeric 1,s- dimethylperhydro-oxazolo[3,4-a] pyridines (5.6 g), b .p. ORGANIC MAGNETIC RESONANCE, VOL. 20, NO. 4, 1982 247 Page ...