怎么解释这个现象? 这是一个用1,2-二溴乙烷做的操作.目标产物是环丙烷上带两个羧酸(不是酯),不过对你而言也一样. to a 1-l solution of aqueous 50% sodium hydroxide (note 1) , mechanically stirred in a 2-l, three-necked flask, was added, at 25°c, 114.0 g (0.5 mol) of triethylbenzylammonium chloride (note 2) . to this vigorously stirred suspension was added a mixture of 80.0 g (0.5 mol) of diethyl malonate and 141.0 g (0.75 mol) of 1,2-dibromoethane all at once. the reaction mixture was vigorously stirred for 2 hr (note 3) . the contents of the flask were transferred to a 4-l erlenmeyer flask by rinsing the flask with three 75-ml portions of water. the mixture was magnetically stirred and cooled with an ice bath to 15°c, and then carefully acidified by dropwise addition of 1 l of concentrated hydrochloric acid . the temperature of the flask was maintained between 15 and 25°c during acidification. the aqueous layer was poured into a 4-l separatory funnel and extracted three times with 900 ml of ether . the aqueous layer was saturated with sodium chloride and extracted three times with 500 ml of ether . the ether layers were combined, washed with 1 l of brine, dried ( mgso 4 ), and decolorized with activated carbon . removal of the solvent by rotary evaporation gave 55.2 g of a semisolid residue. the residue was triturated with 100 ml of benzene . filtration of this mixture gave 43.1–47.9 g (66–73%) of 1 as white crystals, mp 137–140°c. 查看更多
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