Acetic Anhydride → HCID 53940283, compound

Participants

Reaction Steps

The pentadecadiene (D) (5.9 g) in 200 ml methanol containing eight drops concentrated HCl was refluxed for 15 minutes. After the solution was cooled, 400 ml of water were added, and the mixture was extracted three times with hexane. The hexane extract was dried over sodium sulfate, and the hexane was removed with a rotary evaporator leaving 3.1 g of crude 8,10-pentadecadienol, which was purified by silica gel liquid chromatography. Unwanted side products were eluted with 10% ether/hexane, and the alcohol was eluted with 50% ether/hexane, giving 2.5 g (66% yield based on the decenenitrile (B)). 8,10-Pentadecadienol in 75 ml pyridine and 5 ml acetic anhydride was refluxed 1.5 hours. After the solution was cooled, 200 ml hexane was added, and the mixture was extracted successively with water, 6N hydrochloric acid (twice), and water. The pentane phase was dried over sodium sulfate, filtered, and the pentane was removed by rotary evaporation, leaving crude product, which was purified by silica gel liquid chromatography (elution in 10% ether/hexane); the yield was 2.8 g (94% based on the alcohol). The product was 39% EE and 61% EZ by GC analysis.

Provenance & Evidence