Distillation, apparatus under reduced pressure

The combined organic phases are washed with two 200-mL portions of water, four 200-mL portions of saturated sodium bicarbonate solution, and two 200-mL portions of saturated sodium chloride. The organic phase is dried over anhydrous magnesium sulfate, filtered, and concentrated under reduced pressure at room temperature using a rotary evaporator. The crude product is distilled through a short-path distillation apparatus under reduced pressure to give 45.2 g (0.318 mol, 71% yield) of 4-(trimethyls11yl)-3-butyn-l-ol, bp 78-79°C (10 mm), as a colorless liquid (Notes 4 and 5). 

A 1-L three-necked round-bottomed flask, a mechanical stirrer, a dropping funnel, a Dimroth condenser, a heat gun, a Buchner funnel, a rotary evaporator, and a distillation apparatus under reduced pressure. 

A stainless steel autoclave, a magnetic stirrer, and a distillation apparatus under reduced pressure. 

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