halon alternative chemical是什么意思

网络释义

用法例句

A new method for the halogenation of 1,3-dicarbonyl compounds;

1,3-二羰基化合物的卤代反应的一种新方法

Ligand free Ullmann coupling reactions of aryl halides catalyzed by Pd/C were studied in O/W Triton X10 microemulsion(ME) in comparison with biphase systems.

结果表明,微乳体系中联苯收率高于两相体系;比较了在离子、非离子表面活性剂构成的不同微乳体系中的反应活性;研究了卤代芳烃在TX10 ME(O/W)中的甲酸钠、碱类型、Pd/C用量、温度等对反应的影响。

Recent advances in the palladium-catalyzed Ullmann-type coupling of aryl halides in- cluding reductive coupling and oxidative coupling reactions have been reviewed.

综述了钯催化卤代芳烃Ullmann偶合反应的研究进展,其中包括钯催化还原Ullmann偶合反应和钯催化氧化Ullmann偶合反应等两部分。

The reductive coupling of aryl halides to form the corresponding biaryls was effected with high selectivity in water,using formic hydrazide as a reducing agent in the presence of a catalytic amount of Pd/C.

在Pd/C催化下,以甲酰肼为还原剂,卤代芳烃通过还原偶联反应能高选择性地合成相应的联苯化合物。

Molecular structural parameters including inductive effect index(∑I),equilibrium electronegativity of atom(XE),total electron of atom nuclear external(∑e),total bond length of substituents to center atom(∑d) and electronegativity margin for all substituents(ΔX) were used model the 13C chemical shift of 45 halogenated methane.

利用描述电子效应的诱导效应指数(∑I)、原子的平衡电负性(XE)和反映核外电子云变形程度的总电子数(∑e)、各取代基到中心原子的化学键键长总和(∑d)以及各取代基电负性的和差值(ΔX)等参数对45个卤代甲烷化合物中的碳原子结构进行表征,并与其13CNMR谱化学位移建立了优良的定量结构-波谱关系模型:δC=-7403。

A correlation was investigated between the boiling points and molecular structure of halogenated methanes, and a new method was developed to calculate and predict the boiling points of halogenated methanes.

探讨了卤代甲烷的沸点与其分子结构之间的关系 ,发展了一种既能计算卤代甲烷沸点、又能预测未知卤代甲烷沸点的方法 。

Study on the effect of halophenols on antioxidant enzymes and QSAR analysis;

卤代酚类物质对抗氧化酶活性的影响研究及构效分析

In order to study the joint toxicities of the analogous halophenols in aquatic biotas and to provide effective testing method,the authors divided six kinds of halophenols into three couples of equitoxic binary mixture by two exposed concentrations according to their similar structure characters and 48 h LC_(50).

为探讨卤代酚复合污染对水生生物的联合毒性效应,探究较为可靠的检测方法,根据所选6种卤代酚化学结构的相似程度和48 h LC50值,将其分为3组二元混合物进行急性暴露实验,毒性单位比为1∶1,每组分2个浓度级别观察金鱼生物学行为的变化,同时检测金鱼肝脏中3种抗氧化酶(SOD,CAT和GSH-Px)活性以及酶活性影响率的变化。

The toxicity-lgNOEC of 17 chlorobenzenes to the bacteria in the Yangtze River was determined by using the bacteria growth inhibition test,and the range of toxicity was from 4.

本文采用细菌生长抑制实验,测定了17种卤代苯对长江水中混合细菌的慢性毒性,得到-lgNOEC值,毒性范围在4。

The best predicted model was reported for the toxicity of halogeno benzene and phenol derivatives.

应用支持向量回归算法(SVR),以按非氢原子分类的分子电性距离矢量(H-MEDV)为参数,通过参数的优化,建立了几种更强的预测模型,预测了卤代苯和苯酚衍生物的毒性,并根据H-MEDV参数原理对预测结果进行了初步探讨。