反应详情

5.10 ml of a 26% solution of lithium diisopropylamide in THF are added dropwise at −70° C. to 4.00 g of 4-ethynyl-4′-propylbicyclohexyl-4-yl 4-propylcyclohexanecarboxylate in 30 ml of THF, and the mixture is stirred for 15 minutes. A solution of 1.89 g of p-toluenesulfonyl cyanide in 10 ml of THF is subsequently added dropwise to the reaction solution at this temperature, and the cooling is removed. Conventional work-up gives 4-cyanoethynyl-4′-propylbicyclohexyl-4-yl 4-propylcyclohexanecarboxylate (C 89 N (58) I, Δε−10.18, Δn 0.02).

1. customthe cooling is removed