• 比较了乙酰乙酰中间体硝基安定收率影响

    The effect of chloroacetyl chloride and bromoacetyl bromide on yields of intermediates and nitrazepam was compared.

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  • 一般说来,引发剂卤化物组份活性,是随同一原子上的原子数目增多而增长

    In general, the activity of the halide component of the initiator increases with the number of chlorine or bromine atoms joined to a single carbon atom.

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  • 科学家们认为人类造成臭氧层破坏的主要原因一些化学物质,碳,它们到达平流层后会分解,然后臭氧发生化学反应从而破坏臭氧层。

    The problem with the ozone layer is that when certain chemicals, like chlorofluorocarbons, reach the stratosphere, they break down into chlorine and bromine, which react with the ozone and destroy it.

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  • 药效包括氢键受体,一个氢键给体,一个水区一个带有原子的苯环。

    The pharmacophore included a hydrogen bond receptor, a hydrogen bond donor, a hydrophobic area and a phenyl ring with a chlorine or a bromine atom.

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  • 双酚a、环氧丙烷丙烯酸原料合成阻燃乙烯基树脂阻燃性能良好

    Flame retardant vinyl ester resin using tetrabromo bisphenol a, epichlorohydrin, acrylic acid as raw materials was also synthesized, Its flame retardant property was excellent.

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  • 样品四丁基化铵甲烷离子萃取方法相离子对色谱分离联用,水体芳香族磺酸盐的检测提供了可靠的监测手段

    The combination of ion-pair extraction technology with reversed-phase ion-pair chromatography method provide a effective inspection measure for the sulfonates in water.

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  • 作者研究了杀灭酯、二苯醚酯、菊酯氰菊青菜、小白菜、豇豆种蔬菜中的残留降解情况,种农药降解半衰期为1.4~3.1

    Authors researched the degradation of fenvalerate, permethrin, cypermethrin and deltamethrin in 3 vegetables. The half-life of the degradation of 4 Pyrethroids -1.4~3.1 days.

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  • 磷、季四醇、苯胺原料合成了一种具有成炭结构的协效阻燃剂季戊四醇双磷酸三苯胺

    A P-N-Br synergistic flame retardant pentaerythritol bisphosphorate tribromoaniline salt was synthesized using phosphorus oxychloride, pentaerythritol, aniline, and bromine as raw materials.

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  • 西他丁合成乙酰乙酸1--5-戊烷为原料,活性亚甲基烃化、成肟水解3反应得7--2-氧庚酸乙酯;

    The synthesis of Cilastatin sodium started from ethyl acetoacetate and 1-bromo-5-chloropentane, through 3 steps to produce ethyl 7-chloro-2-oxoheptanoate;

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  • 西他丁合成乙酰乙酸1--5-戊烷为原料,活性亚甲基烃化、成肟水解3反应得7--2-氧庚酸乙酯;

    The synthesis of Cilastatin sodium started from ethyl acetoacetate and 1-bromo-5-chloropentane, through 3 steps to produce ethyl 7-chloro-2-oxoheptanoate;

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