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- By oxidation,nitration,condensation,reduction,a organic pigment intermidiate N (3' amino 4' chloro)benzoyl 2 methyl 3 chloroaniline was prepared,through using 4 chloromethylbenzene as first material. 以4-氯甲苯为原料;经过氧化;硝化;缩合;还原反应;制成有机颜料中间体N(3’氨基4’氯代)苯甲酰基2甲基3氯代苯胺.;对影响反应的诸因素进行了讨论;产品总收率为57
- 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。
- Ethyl 4 bromo 2 butenoate,a medicine intermediate,was prepared using 2 butenoic acid as main raw material through esterification and bromination reactions. 以2丁烯酸为原料,通过酯化和溴代反应研制了药物中间体4溴2丁烯酸乙酯。
- 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
- Synthesis of 2 Chloro 3 Methyl 4 (2,2,2 Trifluoro) ethoxypyridine N Oxide 刘鹰翔, 氯代-3-甲基-4-三氟乙氧基吡啶N-氧化物的合成
- Keywords dimethoxy 4 chloro N acetoacetyl aniline;acetoacetanization;diketene; 二甲氧基-4-氯-N-乙酰基乙酰苯胺;双乙烯酮;乙酰乙酰化;
- Subtract 3 from 7 and you have 4. 七减三得四。
- Keywords alkylation chloration 2;5 Dimethoxyl 4 Chloro Nitrobenzene; 烷基化反应;氯化反应;2`5-二甲氧基-4-氯-硝基苯;
- The target compound was synthesized from 1 bromo 3 chloro propane by amination and Grignard reaction with ethyl orthoformate. [方法 ]以 1-溴 - 3-氯丙烷为原料 ,胺化后 ,与原甲酸三乙酯进行格氏加成反应 ,得目标化合物。
- Add up 3, 4 and 5 and you'll get 12. 把三,四,五相加,总数是十二。
- SYNTHESIS AND CHARACTERIZATION OF POLY N ETHYL 4 VINYLPYRIDINE AND METHYL ORANGE COMPLEX DYE 阳明书,李建科, 聚-N-乙基-4-乙烯基吡啶/甲基橙复合物染料的合成及性质研究
- Keywords Reversed phase HPLC;1 (6 chloro 3 pyridinylmethyl) N nitro imidazolidinyl 2 imine;insecticides; 反相高效液相色谱法;吡虫啉;杀虫剂;
- Keywords cyclophane;2;6 Bis(imidazolylmethyl) 4 chloro phenol;dibromide;synthesis; 翁型环番;2.;6-二(咪唑甲基)-4-氯苯酚;二溴化合物;合成;
- Keywords ? 1 chloro 3 (1 naphthyloxy) 2 propanol;optical resolution;enzymatic esterification;lipase; 氯-3-(1-萘氧)-2-丙醇;光学拆分;酶促酯化;脂肪酶;
- Keywords WT5”BZ]4 Chloro benzoyl sulfoxylate;Transition state;Reaction pathway; 次硫酸二对氯苄酯;过渡态;反应途径;
- Visiting time in this hospital is from 4 to 6. 这家医院的探望时间是从4点到6点。
- Let it be 4:25 tomorrow afternoon. 就定明天下午4点25分吧。
- A monthly is more economical than 4 weeklies. 一张月票比四张周票上算。
- He is remanded on his own recognizance of$4,000. 在保证付款4,000美元后他被还押(以后再出庭)。
- The doors were numbered 2,4, 6 and 8. 这些门编为2、 4、 6、 8号。