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- 4 Chloro 4,5 dimethyl 1,3 dioxolan 2 one was synthesized from 3 hydroxy 2 butanone by acylation and cyclization, the yield was above 86%. 以羟基丁酮为原料,经酰化、环合等步骤合成医药中间体4氯4,5二甲基1,3二氧杂环戊烷2酮,合成收率达86%25以上
- Keywords dichloromethyl 3 hydroxy 2 methylpyridine;pyritinol hydrochloride;dichloride sulfoxide; 二氯甲基-3-羟基-2-甲基吡啶;盐酸吡硫醇;氯化亚砜;
- In preparation of 1 chloropinacolone(1 chloro 3,3 dimethy1 2 butanone) by chlorination of pinacolone in methanol, the reaction mixture may vigorously bump sometimes. 在甲醇中氯化片呐酮以制备1-氯代片呐酮（1-氯代-3，3-二甲基-2-丁酮），有时会发生类似暴沸的冲料现象。
- Keywords hydroxy 2 naphthyl hydroxamic acid flotation bastnaesite; 羟基-2-萘羟肟酸;氟碳铈矿;浮选;电负性;螯合特性;
- Is the match on at 2 pm or 3 pm? 比赛是下午2时还是3时开始?
- A Novel 4 Hydroxy 2 hydroxymethyl 2 heptadecyl 1,5 valero lactone from Fish Heart of Aristichthys Nobilis 鱼心中新的4-羟基-2-羟甲基-2-十七烷基-1,5-戊内酯的研究
- If you subtract 3 from 5, you get 2. 五减去三就得二。
- The farmer paid 3 laborers to gather the crop. 农场主雇佣3名工人收割庄稼。
- These fish vary in weight from 3 lb to 5 lb. 这些鱼的重量从3磅到5磅不等。
- Convenient Method for Monitoring Synthesis Process of 4,5 Diamino 6 hydroxy 2 mercaptopyrimidine 孙学芹, 巯基-6-羟基-4,5-二氨基嘧啶合成过程中的简便鉴定方法
- Keywords photosensitized initiator;2 hydroxy 2 methyl 1 propiophenone;synthesis; 光敏引发剂;2-羟基-2-甲基-1-苯基丙酮;合成;
- He lives 3 miles away from here. 他住在距离这里三英里的地方。
- I'm tied up in a meeting until 3 pm. 我开会直到下午三点钟方可脱身。
- Mr. and Mrs. Jones have 3 daughters. 仲斯夫妇有三个女儿。
- The beam has a thickness of 3 inches. 这根梁厚3英寸。
- The government hopes to hold salary increase to 3%. 政府希望将工次增长率控制在3%25。
- The horse racing is to be held at 3 p.m. tomorrow. 赛马比赛将于明天下午3点举行。
- We ordered 3 cases of soda for the party. 我们为晚会定购了三箱苏打水。
- Above term only apply to dorsa above 3,000 bales. 以上条件，仅适用于三千捆以上的订单。
- The farmer paid 3 labourers to gather the crop. 农场主雇佣3名工人收割庄稼。
