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- The method of preparation of the key intermediate,4 amino 1 methyl 3 n propylpyrazole 5 carboxamide(6)was improved. 改进了重要中间体4氨基1甲基3正丙基吡唑5酰胺(6)的合成工艺。
- A new method for the synthesis of 1 methyl 3 propylpyrazole 5 carboxlic acid from 2 pentanone and diethyl oxalate is reported. 以2-戊酮和草酸二乙酯为起始原料,经缩合、与甲基肼环合、水解等三个步骤合成了1-甲基-3-丙基吡唑-5-羧酸。
- Three compounds were isolated from the EtOAc soluble portion,identified as morelloflavone(5),methyl 3,5-dihydroxy-4-methoxybenzoate(6),3-hydroxy-4-methoxy cinnamic acid(7). 从醋酸乙酯部位分离鉴定了3个化合物:morelloflavone(5),3,5-二羟基-4-甲氧基-苯甲酸甲酯(6),3-羟基-4-甲氧基-反式桂皮酸(7)。
- Hexamethylene glycol bis[3 (3,5 di tert butyl 4 hydroxyphenyl)] propionate was synthesized without solvent with methyl 3 (3,5 di tert butyl 4 hydroxyphenyl) propionate and hexamethylene glycol as raw materials and organic tin as catalyst. 以 3 -(3 ,5 -二叔丁基 -4-羟基苯基 )丙酸甲酯 (简称 3 ,5 -甲酯 )与 1 ,6-己二醇为原料 ,有机锡为催化剂 ,在无溶剂的条件下合成了己二醇双 [3 -(3 ,5 -二叔丁基 -4-羟基苯基 ) ]丙酸酯。
- Methyl 3 (3,4 methylenedioxyphenyl)acraldehyde was synthesized through Claisen Schmidt condensation reaction of the heliotropin and propanal with KF/Al 2O 3 as a catalyst, in yield over 80%. 以 KF/Al2 O3 作催化剂 ,催化洋茉莉醛和丙醛的 Claisen-Schmidt缩合反应合成了 2 -甲基 -3 -(3 ,4-亚甲二氧基苯基 )丙烯醛 ,收率超过 80%25。
- Methyl 3 nitropyridine was synthesized in 60% overall yield from 2 amino 4 methylpyridine via nitration, replacement of diazonium group by hydroxyl group, chlorination and dechlorination. 以2-氨基-4-甲基吡啶为原料,通过硝化、重氮化羟基置换、氯化及脱氯等4步反应制得标题物,总收率60%25。
- 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
- methyl 3β-hydroxy-5-androstene- 17β-carboxylate 3β-羟基-5-雄甾烯-17β-羧酸甲酯
- 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。
- Studies on reaction between methyl 3,5-dinitrobenzoate and hydrazine hydrate 3,5-二硝基苯甲酸甲酯与水合肼的反应研究
- 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。
- Keywords Bis（2 methyl 3 furyl）disulfide;Chicken meat flavor;GC MS; 二（2-甲基-3-呋喃基）二硫醚;鸡肉味香精;色谱-质谱;
- 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。
