化合物

Triazole is an interesting moiety, which plays an important role in biological activity. In recent years, many efforts have been paid to develop 1,2,3-triazole derivatives on the basis of many lead compounds with various pharmacological activities, and quite a few successful examples have been seen. Unfortunately, in contrast with 1,2,4-triazole, 1,2,3-triazole has only a few ways to be prepared.

1，2，3-三氮唑类化合物所具有的广泛生物活性正受到人们的日益重视，在已有的和新开发的各类药物中常可见1，2，3-三氮唑的结构，而以它为药效基团改良各种先导化合物取得成功的例子也屡见不鲜。

We at last got six compounds of Schiff Bases of triazole derivaties and five compounds of 1,3,4-oxadiazole.

由于酰肼便宜易得，因此我们选取了两种酰肼通过几种不同的方法合成了五种唑类化合物并以其中三种化合物为基础对其进行修饰，得到了六种含三氮唑取代基的席夫碱和五种1，3，4-噁二唑类衍生物。

Second, using DBU as the base for enolization of propargylic esters of unsaturated acids 18e-k, we developed a tandem Ireland-Claisen rearrangement /isomerization reactions. It has been shown that the reaction sequence affords triene molecules 42a-b and 43a-b in moderated to high yields. Interestingly, with allyl hexa-3,5-dienoates 18i-j as the substrate, the rearranged products underwent further aromatization to give uniquely substituted benzyl acids 44a-b.

其次，以含有活泼质子的烯酸炔丙酯18e-k为底物，在DBU为烯醇化碱、TMSCl为硅试剂的条件下，底物18e-h发生了Ireland-Claisen重排/异构化串联反应，得到完全共轭的三烯类化合物42a-b及43a-b；而以己二烯酸炔丙基酯18i-j为底物时，重排/异构化后的产物进一步发生电环化等反应最终得到芳构化产物——取代苯甲酸类化合物44a-b。

Sodium tungstate andthioacetamide were used as the tungsten and sulfur sources, respectively.

在醋酸体系中，中介结构钨硫化合物WS-M和WS-L2系列化合物被合成出来。

In addition, because these receptors have more binding points, they have better binding properties for anions than the molecular tweezer receptors based on thiourea we reported last time.

与以前我们报道的受体化合物相比，由于此类分子钳受体化合物具有更多的阴离子识别位点，因此具有更好地阴离子识别性能。

Eleven molecular tweezer artificial receptors based on deoxycholic acid have been synthesized by using solid K2CO3 as supporter through the reaction of methyl deoxycholate with aroyl chloride in solvent-free conditions under microwave irradiation, five of which are new compounds. The structures of all the molecular tweezers were characterized by 1H NMR, IR, MS spectra and elemental analysis.

在微波辐射无溶剂条件下，以固体K2CO3为载体，脱氧胆酸甲酯与芳酰氯反应合成了11个脱氧胆酸分子钳人工受体，其中5个为新化合物，所有化合物的结构均经1H NMR， IR， MS及元素分析所确证。

In order to mimic the function of Tyr in OEC, tyrosine-attached complexes 15～18, 18 werealso synthesized.

通过同样的方法确定了锰化合物16、18的价态为Mn，而化合物18'的价态为Mn。

A univalent organic radical, C2H5.releasing or activated by acetylcholine or a related compound.

释放出乙酰胆碱或相关化合物，或者被乙酰胆碱或相关化合物活化。

The results show that the urushiol dimer has the similarstructure with this compound.Therefore,we concluded that thestructure of alkyl phenyl ether is main structure formed in urushiolpolymerization.

合成并用2D—NMR方法研究了烷基芳醚化合物：2—丁基苯醚此化合物的NMR数据进一步确证了烷基芳醚型漆酚二聚体的存在。

Thiocarbonyl compounds have similar chemical properties to those of carbonyl compounds because of their similar valence electron structures.

硫代羰基化合物与羰基化合物具有相似的价电子结构，因而具有类似的化学性质。

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。