Acetylene → 6-Cyclopentylidene-3-methylhex-1-yn-3-ol

Participants

Reaction Steps

Acetylene was bubbled for 50 minutes through a solution of tBuOK (33.8 g; 0.30 mol) in THF (240 ml) at 0° C. The resulting beige suspension was treated with 5-cyclopentylidenepentan-2-one (41.7 g; 0.27 mol) added dropwise for 15 minutes at 0° C. The resulting mixture was warmed gently to room temperature and quenched with saturated NH4Cl (180 ml). The aqueous phase was separated and extracted with MTBE (2×120 ml). The combined organic layers were washed with H2O(240 ml), brine (100 ml), dried over MgSO4, and concentrated in vacuo. Distillation (69° C.-71° C./0.09 torr) afforded 38.95 g (81% yield) of 6-cyclopentylidene-3-methylhex-1-yn-3-ol.

Provenance & Evidence