Reacción #409083

Ecuación de reacción

butyllithium

hexane

bromobenzene

dimesityifluoroborane

→

product

Dimesitylphenylborane

Disolventes

water

tetrahydrofuran

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.STIRRINGstirred for a further hour
2. 2
   Filtraciónthe resulting suspension is filtered
3. 3
   OtroThe product is purified by trituration with boiling methanol

Procedimiento

1.1 equivalents of 1.6 M butyllithium in hexane (37.5 ml, 0.066 mol) are added over the course of 15 minutes at −78° C. to a solution of 9.42 g (0.06 mol) of bromobenzene in 80 ml of tetrahydrofuran (TH F). The reaction mixture is stirred at this temperature for 3 h. Then 16.1 g (0.06 mol) of solid dimesityifluoroborane are added, and the mixture is allowed to warm to room temperature and stirred for a further hour. The mixture is poured into 500 ml of water and the resulting suspension is filtered. The product is purified by trituration with boiling methanol, to give 16.9 g (86% of theory) of the product as a white solid with a melting range of 185-187° C. The shifts δ in the 1H NMR, measured in CDCl3 are 7.50 ppm (d,2,J=7 Hz), 7.46 ppm (t, 1,J=10 Hz), 7.50 ppm (br t, 2, J=7 Hz), 6.82 ppm (s,4), 2.30 ppm (s,6) and 2.00 ppm (s,12).

Fuente