反应详情

In 20 ml of dry benzene were dissolved 2.0 g of α-(2,2-dichlorovinyl)isovaleric acid, followed by the addition of 6.0 g of thionyl chloride. The mixture was refluxed overnight. It was then distilled to remove the low-boiling fraction, whereby α-(2,2-dichlorovinyl)isovaleroyl chloride was obtained. This α-(2,2-dichlorovinyl)isovaleroyl chloride was dissolved in 25 ml of dry benzene, followed by the addition of 2.3 g of α-cyano-3-phenoxybenzyl alcohol and, then, 2.4 g of pyridine. The mixture was stirred at room temperature overnight. The resultant reaction mixture was diluted with diethyl ether, washed with water and dilute aqueous hydrogen chloride, dried over anhydrous magnesium sulfate and distilled to remove the low-boiling fraction. Column chromatography was carried out on the residue to obtain 3.2 g of α-cyano-3-phenoxybenzyl α-(2,2-dichlorovinyl)isovalerate (Compound [1]) which was shown to have the properties given below [yield: 78% based on α-(2,2-dichlorovinyl)isovaleric acid].

1. temperatureThe mixture was refluxed overnight
2. distillationIt was then distilled
3. customto remove the low-boiling fraction