反应详情

Into a 500 ml Parr hydrogenation flask fitted with an aluminum or copper cooling coil is placed 100 g of 7,11-hexadecadiynyl acetate, 100 ml hexane (olefin free), 1 g palladium on calcium carbonate (Lindlar catalyst) and 10 drops of synthetic quinoline. Hydrogenation is effected at 10- 20 psi and is complete when the theoretical amount of hydrogen for the partial reduction of two triple bonds is absorbed. During the hydrogenation the reaction temperature is maintained between 15°-25° to minimize cis-trans isomeration. The catalyst is then removed by filtration and the product isolated by distillation of the filtrate. bp 130°-132°/1 torr nD21 1.4592. Yield essentially quantitative. Based on IR analysis it is estimated that there is less than 5% of E isomers present.

1. customis absorbed
2. temperatureDuring the hydrogenation the reaction temperature is maintained between 15°-25°
3. customThe catalyst is then removed by filtration
4. customthe product isolated by distillation of the filtrate
5. customYield essentially quantitative