醚的

Under high dilution,the cross-coupling reactions of 4,5-dicyano-1,3-dithiol-2-one(6) and dithia crown-ether annulated tetrathiafulvalenes(3a～3c) in toluene gave asymmetrical dicyano tetrathiafulvalene derivatives(7a～7c) in the presence of triethyl phosphite.The compounds 7a～7c were characterized by(~1HNMR,EA,MS and IR.

在甲苯溶液中，在亚磷酸三乙酯存在下，采取高度稀释的方法，使4，5-二氰基-1，3-二硫杂环戊二烯-2-酮分别和多缩硫杂冠醚进行交叉偶联反应，成功地得到了不对称的2，3-二氰基四硫富瓦烯衍生物。

Both acrous gramineus and α-asarone can suppress seizure and abnormal discharge of frontal cortex induced by pentylenetetrazol in young rats availably.

石菖蒲及α-细辛醚均能有效抑制戊四氮诱发的幼鼠癫痫发作和额叶皮层的异常放电。

Objective To observe the effect of acrous gramineus and its main component α-asarone on eclamptic behaviors and frontal lobe discharge in the young rats with experimental epilepsy induced by pentylenetetrazol.

目的：观察中药石菖蒲及其主要成分α-细辛醚对戊四氮诱发的实验性癫痫幼鼠惊厥行为和额叶皮层放电的影响。

Objective To observe the effect of acrous g ramineus and its main component α-asarone on eclamptic behaviors and frontal lobe discharge in the young rats with experimental epilepsy induced by pentylenetetrazol.

目的：观察中药石菖蒲及其主要成分α-细辛醚对戊四氮诱发的实验性癫痫幼鼠惊厥行为和额叶皮层放电的影响。

A novel liquid crystalline compound named p-phenylenediamine di 4-[2- benzamide] was synthesized from allyl 2-hydroxyethylether, ethyl 4-hydroxybenzoate and p-phenylenediamine.

以乙二醇单烯丙基醚、对羟基苯甲酸乙酯、对苯二胺为原料合成了末端为不饱和双键的芳香聚酰胺溶致型液晶化合物——二对烯丙氧基乙氧基苯甲酰对苯二胺，最佳合成的摩尔比为∶羧酸∶对苯二胺∶吡啶=2。

Benzylic ether phenolic resin is one of the main components of foundry polyurethane binder; its structure and preparation condition determine the performances of polyurethane binder.

苯醚型酚醛树脂是铸造用聚氨酯粘合剂的主要成份之一，它的结构及合成工艺条件决定了该类粘合剂性能。

Four kinds of aromatic ether-linked dinitriles with low melting temperatures were obtained via the nucleophilic substitution of hydroquinone, resorcinol, biphenol and bisphenol A with CBN. They were polymerized to afford a series of poly(pheny-s-triazine)s under the optimized conditions.

以对苯二酚、间苯二酚和联苯二酚为原料，分别与对氯苯腈进行亲核取代反应，合成了三种较低熔点的含醚键二腈，并分别研究了其在优化条件下的聚合反应。

The synthesized model compounds with the catalytic function of bromination and sulfoxidation are

本文介绍已合成并具有溴化或硫醚氧化催化功能的V2HPOs的模型配合物。

BACKGROUND: Isoflurane is one of the most commonly used volatileanesthetics, yet the cardiorespiratory depression that occurswith its use remains poorly understood.

背景：异氟醚是最常用的吸入麻醉药之一，然而其心肺抑制的机制知之甚少。

The synergistic effect between chlorinate paraffin,dechlorane plus, decabromodiphenyl oxide and on fire-retardant properties of low density polyethylene was studied.

研究了氯化石蜡、双环辛烷以及十溴联苯醚并用阻燃低密度聚乙烯的阻燃协同效应，采用锥形量热仪测试了阻燃体系的燃烧特性。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。