Cyclopentanol → Cyclopentyl 4-methylbenzene-1-sulfonate

Participants

Reaction Steps

A round-bottomed separable flask (3,000 cc) equipped with a mechanical stirrer was charged with cyclopentyl alcohol (500 g, 5.80 mol) and p-toluenesulfonyl chloride (1,210 g, 6.35 mol), followed by the addition of pyridine (2,000 mL) under ice cooling to form a solution. The mixture was stirred for 8 h as it was warmed gradually to room temperature. After completion of the reaction, the reaction mixture was poured into ice water (3,000 mL) and stirred thoroughly. The precipitating solids were isolated by filtration, washed thoroughly with water and dried to give a white crystal of cyclopentyl p-toluenesulfonate (1,117 g; yield=80.1%). MP: <30° C. 1H-NMR(CDCl3,TMS,ppm): δ1.23-2.07(8H,m), 2.45(3H,s), 4.98(1H,m), 7.38(2H,d,J=9.0Hz), 7.85(2H,d,J=9.0Hz).

Provenance & Evidence