Hydrogen Bromide → DL-alpha-Tocopherol

Participants

Reaction Conditions

Reaction Steps

To a mixture consisting of 23.3 g (0.153 mol) of 2,3,5-trimethylhydroquinone, 23.2 g (0.153 mol) of zinc bromide, 52.9 ml of diethyl carbonate and 4.3 g of 47% hydrobromic acid, was added dropwise, under stirring at 50±5° C. over one hour, 46.2 g (0.153 ml) of isophytol (purity: 98.1%). Further, the resulting mixture was stirred for one hour at the same temperature. The reaction liquid was washed several times with 50 ml of water, followed by concentrating under a reduced pressure, whereby 66.7 g of the title compound was obtained as a brown oil (yield: 99.1 %, GLC purity: 98.0%).

Provenance & Evidence