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In the process of laboratory study, oxycodone was prepared by oxidating thebaine at 6,14-position under oxydol, hydrodeoxidizing 7,8-position double bond and 14-position ether under palladium catalyst. Furthermore, N-methyl of oxycodone was isolated byα-chloro-ethyl chloroformate under anhydrous condition and protection of 14-position hydroxyl to obtain noroxycodone, which was further converted into methylnaltrexone by N-alkylation in presence of cyclopropyl bromomethane, then by isolating 3-position methyl of methylnaltrexone under boron tribromide, becoming hydrochloride to prepare target compound, natrexone hydrochloride.
实验室工艺方面,本文首先用双氧水氧化蒂巴因的6-位和14-位、在钯炭催化下加氢还原7-8位双键和14-位醚合成羟考酮,然后提出并优化了在无水和14-位保护的情况下,用氯甲酸-α-氯乙酯脱去羟考酮的N-位甲基合成去甲羟考酮,再用环丙甲基溴将去甲羟考酮的N-位烷基化合成甲基纳曲酮,最后采用三溴化硼脱去甲基纳曲酮的3-位甲基和成盐酸盐合成盐酸纳曲酮。
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All of the tripodal schiff base ligands and their complexes were characterized.
以三乙醇胺、巯基苯胺、巯基乙胺为初始原料,设计合成了六个三脚架结构的化合物,其合成路线如下:三乙醇胺与氯化亚砜反应得到三(2-氯乙基)胺(1),然后与巯基苯胺或巯基乙胺在碱性条件下反应生成三脚架结构的三{[2-(2-氨基苯基)硫代]乙基}胺(2)或三{[2-(2-氨基乙基)硫代]乙基}胺(3),然后再与水杨醛、2-甲酰基-8-羟基喹啉(8)、2-甲酰基-8-苄氧基喹啉(7)反应得到六种新型的含硫西佛碱化合
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Aminobenzothiazoleswere diazotized and then coupled with active methylenecompounds to form a kinds of new hydrazones.
苯基硫脲在浓硫酸中,先在溴作用下氧化合环,再直接硝化,得到产率95%,纯度98%的2-氨基-6-硝基苯并噻唑。
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Keep a bottle of water or a rehydrating freshener on your desk at work.
工作时,在办公桌上放一瓶水或一瓶再化合清凉剂,用于提神。
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acetic anhydride:醋酸酐
合成阿斯匹灵的方法,可由柳酸(salicylic acid)和醋酸酐(acetic anhydride)在酸性触媒(磷酸或硫酸)或碱性触媒(醋酸钠)的催化下化合而成. 再利用阿斯匹灵几乎不溶於冷水的特性,使其析出白色的晶体,达到纯化的效果.
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recombination continuous spectrum:复合连续光谱
recombination coefficient 再化合系数 | recombination continuous spectrum 复合连续光谱 | recombination fluorescence 再结合萤光
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recombination coefficient:再化合系数
recombination 再化合;再结合 | recombination coefficient 再化合系数 | recombination continuous spectrum 复合连续光谱