Isopentyl acetate drying

Isoamyl acetate (l-butyl-3-methyl acetate, isopentyl acetate) [123-92-2] M 130.2, b 142.0 , d 4 0.871, n p 1.40535. Dry the acetate with finely divided K2CO3 and fractionally distil it. [Beilstein 2IV 157.]... 

It would be helpful now to study the separation scheme for isopentyl acetate shown in Technique 2, Figure 2.1. Note carefully how the following procedures are shown in a flowchart the extraction step with NaHCOg, the drying step with anhydrous NajSO, and the distillation step. Also note that in this experiment it is not possible to identify with certainty the actual impurities present with isopentyl acetate just before the product is distilled. In some experiments it will be possible to make a good guess about the identity of mosf subsfances at each step in the separation scheme. 

Acetaldehyde diisopentyl acetal Acetylene (29.5 g) is led into isopentyl alcohol (200 g) containing a 63 % solution (10 g) of boron trifluoride in methanol and also some (1 g) mercury(n) oxide. When reaction is over, the solution is washed with a little water and sodium carbonate solution and extracted with ether. The ethereal solution is dried over K2C03 and fractionated. 

In the isolation procedure, much of the excess acetic acid and the remaining isopentyl alcohol are removed by extraction with sodium bicarbonate and water. After drying with anhydrous sodium sulfate, the ester is purified by distillation. The purity of fhe liquid product is analyzed by performing a microscale boiling point determination or infrared spectroscopy. 

Reagents and Equipment. In a 5.0-mL conical vial containing a magnetic spin vane and equipped with a reflux condenser protected by a calcium chloride drying tube, place 800 gL (7.4 mmol) of isopentyl alcohol, 1.5 mL (26.2 mmol) of glacial acetic acid, 4 drops (Pasteur pipet) of concentrated sulfuric add, and approximately 100 mg of silica gel beads... 

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