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[求助]
求大神翻译下下面两段话，有机化学类的，谢谢……
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Realizing the importance of polyhydroquinoline derivatives, severalsynthesis methods have been reported, like conventional heating [7],refluxing in acetic acid [8] and microwave irradiation [9] and ultrasound[10]. Different other approaches for the syntheses of polyhydroquinolinederivatives using various catalysts, such as TMSCl [11], ionic liquids[12,13], L-proline [14], polymers [15], Yb(OTf)3[16], Sc(OTf)3[17],HClO4–SiO2[18], cerric ammonium nitrate [19], heteropoly acid [20],p-TSA [21], HY-zeolite [22] and Mont. K10 [23] have also been reportedand some of the methods are associated with several shortcomingssuch as long reaction times, expensive reagents, harsh reaction condi-tions, low-product yields and the use of large quantity of volatile organic solvents. In recent years, heterogeneous catalysts are gaining more impor-tance due to environmental and economic factors. The efficiency canbe improved by using nanosized catalysts because of their small sizeand large surface to volume ratio. It has been observed that Ni0-nanoparticles as catalysts offer great attention for a wide range of appli-cations in organic transformations such as chemo-selective oxidativecoupling of thiols [24], reduction of aldehydes and ketones [25–27], hy-drogenation of olefins [28] and support for hydrogen adsorption [29].Recently, the progress in the field of solvent-free reactions is gainingsignificance because of their high efficiency, operational simplicity andenvironmentally benign processes. The multi-component reactions are powerful tools in the modern drug discovery process and allow fast, automated and high throughput generation of organic compounds.The possibility of performing multi-component reactions undersolvent-free conditions with a heterogeneous catalyst could enhancetheir efficiency from an economic as well as an ecological point of view. |
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爱与雨下: 金币+1 2014-09-25 07:28:04
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认识到多聚羟基喹啉衍生物的重要性，已（报道）有几种合成方法，如传统的加热法【7】，在乙酸回流法【8】和微波照射法【9】，以及超声法 【10】。另外也报道了一些不同的合成多聚羟基喹啉衍生物的其他方法，使用了各种催化剂，如TMSC【[11】，离子液体【12,13】，L-脯 氨酸【14】，聚合物【15】，Yb（OTf）3【16】，Sc（OTf）3【17】，HClO4-SiO2【18】，cerric硝酸铵 【19】，杂多酸【20】，对甲苯磺酸【21】，HY-沸石【[22】和蒙脱石 K10【23】，其中有些方法与几个缺点相关，如反应时间长、试剂昂贵、苛刻的反应条件、低产品产率，以及使用大量的挥发性有机溶剂等。 近年来，由于环境和经济因素非均相催化剂获得更重要（地位）。由于它们的小尺寸和大的表面积与体积比，纳米大小的催化剂可以改善其效率。据观察，Nio纳米颗粒作为催化剂在有机转化，如硫醇的化学 - 选择性的氧化偶合【24】，醛和酮的还原【25-27】，烯烃加氢【28】，和氢的吸附【29】等中的广泛应用引起极大关注。最近，无溶剂反应领域因其高效、操作简单和对环境有益的工艺流程而取得有意义的进展。多组分反应是在现代药物发现过程的有力工具，使能够快速、自动化和高通量合成有机化合物。从经济和生态角度看，用非均相催化剂在无溶剂条件下进行多组分反应的可能性可以提高其效率。 |
2楼2014-09-25 06:57:39
3楼2014-09-25 08:45:13