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- Under the acid free condition, 3 acetyl 2 hydroxy 6 methyl pyran 4 one (8) was obtained and its structure was confirmed by X ray diffraction analysis. 在没有酸催化的条件下,反应生成3乙酰基2羟基6甲基-吡喃4酮(8),并通过单晶X射线衍射分析确定了产物的结构;
- 1.5 bis (2 hydroxy 5 sulfophenyl)-3-cyanoformazan 1,5-二(2-羟基-5-磺酸基苯)-3-氰基甲膳
- any of a class of alcohols having 2 hydroxy groups in each molecule 每个分子中含两个羟基的一类醇
- Using inorganic base as a catalyst, 2,2-dimethylolbutyraldehyde was prepared by the aldol condensation from formaldehyde and butyraldehyde. 甲醛和丁醛在碱性催化剂的存在下,进行羟醛缩合反应,制备2,2二羟甲基丁醛。
- Synthesis of S (-) N [(1 ethyl 2 pyrrolidinyl) methyl] 2 hydroxy 3 iodo 6 methoxybenzamide 胡名扬,梁高林, 乙基-2-吡咯烷基)甲基]-2-羟基-3-碘-6-甲氧基苯甲酰胺的合成
- Keywords di (2 hydroxy 5 sulfophenyl) 3 cyanoformazan disodium salt(DSPCF);Aluminium;fluorine;colour reaction; 二(2-羟基-5-磺基苯基)-3-氰基甲月替;铝;氟;显色反应;
- 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;
- Will 2,000 dozens be enough for selling? 两千打够卖吗?
- SPECTROPHOTOMETRIC STUDIES ON AND APPLICATIONS OF THE REACTION OF COPPER WITH 2 HYDROXY 3 CARBOXY 5 SULFOBENZENEDIAZOAMINOAZOBENZENE 郭忠先, 铜与2-羟基-3-羧基-5-磺酸基苯重氮氨基偶氮苯反应的分光光度法研究及应用
- The counselor bilked his clients out of$2 million. 那位顾问从他的顾客那里骗取了200万美元。
- Every afternoon the baby takes a nap for 2 hours. 每天下午宝宝都要睡两个小时。
- He added 2 gallons of fuel to his car. 他给汽车加了2加仑油。
- She demonstrated that 2 and 2 are four. 她证明2加2等于四。
- If you subtract 2 from 8, you get 6. 8减去2是6。
- The book will run to nearly 2,000 pages. 这本书将厚达两千页之多。
- The bridge is almost 2 kilometers long. 这座桥差不多有两公里长。
- The diameter of the tree-trunk is about 2 meters. 这树干的直径大约是2米。
- This fossil may be over 2 million years old. 这化石可能超过二百万年了。
- The bridge is almost 2 kilometres long. 这座桥差不多有两公里长。
- The doors were numbered 2,4, 6 and 8. 这些门编为2、 4、 6、 8号。