反应详情

A solution of 15 g (86 mmole) of 2-phenylcyclohexanone in 60 mL of carbon tetrachloride at -5° C. was treated via rapid dropwise addition with a solution of 14.4 g (90 mmole) of bromine in 70 mL of carbon tetrachloride so as to maintain the reaction temperature below 5° C. The color disappeared rapidly. The mixture was concentrated in vacuo to a brown solid and the solid triturated with methanol. The resulting white solid was collected by filtration to provide 9.55 g of product. After cooling the mother liquor at -25° C., an additional 5.2 g of solid was obtained, for a total yield of 68%, a portion of which was carried on directly in Step B below.

1. temperatureto maintain the reaction temperature below 5° C
2. concentrationThe mixture was concentrated in vacuo to a brown solid
3. customthe solid triturated with methanol
4. filtrationThe resulting white solid was collected by filtration