反应详情

9.66 ml of a 15% solution of n-butyllithium in hexane are added dropwise at −70° C. to 4.80 g of 4-ethynyl-4,4′-dipentylbicyclohexyl in 40 ml of THF, and the mixture is stirred for 15 minutes. A solution of 0.99 ml of iodomethane and 1.914 ml of 1,3-dimethyltetrahydro-2-pyrimidinone 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 4,4′-dipentyl-4-prop-1-ynylbicyclohexyl (C 35 N 35.4 I, Δε−1.54, Δn 0.01).

1. customthe cooling is removed