大侠们帮忙看下 关于泵流量的？ NORMAL AND RATED CAPACITIES ARE BASED ON ESTIMATED MINIMUM CAPACITY PUMP AVAILABLE AND INCLUDE PUMP MINIMUM FLOW REQUIREMENT查看更多3个回答 . 4人已关注
帮忙分析一下这个反应的机理？ Synthesis of dimethyl 1-bromo-2-oxopropylphosphonate: <BR>A 1-liter eggplant type flask was charged with 30.1 g (0.181 mol) of dimethyl 2-oxopropylphosphonate and 300 ml of tetrahydrofuran, to which 18.5 ml (0.181 mol) of 30% aqueous hydrogen peroxide and 20.3 ml (0.181 mol) of a 49% aqueous solution of hydrobromic acid were added over 3 hours at 20.degree. C. using a dropping funnel. Thereafter, the contents were stirred for 3 hours at 20.degree. C. To the resultant mixture, 200 ml of water and 100 ml of diethyl ether (hereinafter referred to as "ether") were added to vigorously stir the resulting liquid mixture, followed by separation of liquids. After sodium chloride was added to the resultant water layer to saturation, the saturated solution was subjected to extraction twice with ether and once with ethyl acetate. The thus-obtained organic layers were collected, dried over sodium sulfate and then filtered. The solvent was distilled out of the resulting filtrate, thereby obtaining 31.8 g of a product in the form of a yellow oil. <BR><IMG src="http://bbs.dianfenmi.com/pic/1.JPG" border=0>查看更多7个回答 . 2人已关注
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