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- They are often synthesized from isocyanates or substituted ureas. 其合成方法主要有异氰酸酯法和取代脲法等方法。
- Eight substituted ureas herbicides were synthesized with bis(trichloromethyl) carbonate(BTC).The production structures were identified by elemental analysis and IR. 用二(三氯甲基)碳酸酯(BTC)代替光气,“一锅法”合成了8种取代脲类除草剂,产物结构经元素分析、IR确证。
- Synthesis and Application of Unsymmetrically Substituted Ureas 非对称取代脲的合成与应用
- Keywords N Substituted trichloroacetamide;Substituted ureas;Synthesis.; 取代三氯乙酰胺;取代脲;合成;
- Keywords substituted urea uranyl complex extraction crystal structure; 取代脲;铀酰配合物;萃取;晶体结构;
- Keywords N-substituted trichloroacetamide;substituted urea;herbicide;synthesis; 取代三氯乙酰胺;取代脲;除草剂;合成;
- Keywords bis(trichloromethyl) carbonate;synthesis;substituted ureas;herbicide;one-pot; 二(三氯甲基)碳酸酯;合成;取代脲;除草剂;一锅法;
- The coach substituted Smith for Jones. 教练让史密斯上场,换下了琼斯。
- Tom substituted for the injured player. 汤姆替换了那个受伤的运动员。
- Keywords unsymmetrically substituted urea;selenium catalyst;reductive carbonylation;substituted reaction; 非对称取代脲;硒催化;还原羰基化;置换反应;
- The understudy was substituted when the leading actor fell ill. 主角演员患病,由替角代替演出。
- A striker was substituted for a midfield player in the last half-hour of play. 在比赛的最后30分钟里,一个中场运动员被一个强攻手替换了下去。
- We substituted a red ball for blue to see if the baby would notice. 我们用红皮球换下了蓝皮球,看这婴儿会不会发觉。
- Home-made parts are being substituted for imported ones. 国产零件取代进口零件。
- substituted ureas 取代脲
- She substituted margarine for butter. 她用人造的奶油代替黄油。
- He substituted as the typist in the office. 他代替做这个办公室的打字员。
- A clathrate compound, such as urea. 包合物一种笼状化合物,如尿素
- We had to eat some potatoes substituted as a meal. 我们只得吃了几个马铃薯充饥。
- He substituted for the typist during her absence. 打字员不在时由他代替。