3,7-Dimethyl-1-octyn-3-ol → 3,7-Dimethyloct-1-en-3-ol

Participants

Reaction Steps

An autoclave having an internal volume of 3 liters was charged with 1,140 g of the hexane solution containing 3,7-dimethyl-1-octyn-3-ol thus obtained and 0.27 g of a Lindlar catalyst (supported on calcium carbonate) to carry out the hydrogenation for 4 hours under hydrogen pressure of 5 to 8 kg/cm2 (gauge pressure) at a temperature of 25 to 43° C. Thereafter, the catalyst was filtered off, and the resultant filtrate was concentrated with a rotary evaporator to give crude 3,7-dimethyl-1-octen-3-ol. Above the procedures for the hydrogenation of 3,7-dimethyl-1-octyn-3-ol were repeated once more to obtain, in total, 1,590 g of crude 3,7-dimethyl-1-octen-3-ol. Analysis by gas chromatography (column: DC-550, available from Gasukuro Kogyo Inc.; column length: 3 m; column temperature: 100° C.; and column: PEG-HT, available from Gasukuro Kogyo Inc.; column length: 3 m; column temperature: 130° C.) revealed that the conversions of 3,7-dimethyl-1-octyn-3-ol were 99.7% and 97.3% for the respective runsof the hydrogenation, and the selectivities to 3,7-dimethyl-1-octen-3-ol were 95.0% and 95.8%, respectively.

Provenance & Evidence