Ammonia → Tetradec-7-yn-1,14-dial dimethylacetal

Participants

Reaction Steps

To a stirred suspension of lithium amide, prepared from 1.45 g (0.21 atom) of lithium in ca. 200 ml of liquid ammonia was added 30.6 g (0.18 Mole) of 1,1-dimethoxy-oct-7-yne over a period of 10 min. Dimethyl-sulfoxide (100 ml) was then added, followed by 62.5 g (0.23 Mole) of 1,1-dimethoxy-6-iodohexane within 10 min. Work-up as above gave an oil, from which low-boiling impurities were removed by heating at 100°/0.05 Torr. Crude tetradec-7-yn-1,14-dial dimethylacetal (40.8 g, 72% yield) was used without further purification. A sample was submitted to a rapid distillation: b.p. 140°/0.05 Torr.--IR: 1125, 1070, 1050 cm-1.

Provenance & Evidence