盐酸大观霉素的晶体结构

根据盐酸大观霉素的溶解度特性，采用自然冷却法培养出单晶。X-射线衍射分析表明，采用冷却和溶析两种结晶方式得到的盐酸大观霉素晶体都属正交晶系，P212121空间群。盐酸大观霉素分子中的羰基以水合形式存在。由结构分析推测，b方向氢键作用形成的分子链是盐酸大观霉素晶体呈棒状外形的主要原因。     

Studies on the synthesis and electron spectra of 2,6-bis (<Emphasis Type="Italic">p</Emphasis>-Aminophenyl) benzo [1,2-d; 5,4-d']bisoxazole

A novel method to synthesize 2,6-bis(p-aminophenyl)benzo[1,2-d;5,4-d′]bisoxazole using 1,2,3-trichlorobenzene as the starting material through nitration, substitution, hydrogenation, and condensation was reported. During the condensation, the influence of the amount of SnCl₂ on the yield of the product was studied. The electron spectra of the compound were discussed, the results showed that it is a fluorescence material with large Stokes shift. Foundation item: Supported by the High Technology Research and Development Program of China (2002AA305109) Biography: Chen Xiang qun (1969), female, Ph. D candidate, research direction: organic and polymer materials.     

催化光度法测定痕量钼──钼（Ⅵ）─盐酸联氨─苯胺蓝体系

拟定了测定痕量钼的新催化光度法，方法基于盐酸联氨还原苯胺蓝钼（Ⅵ）的催化效应。研究了溶液ｐＨ值、试剂浓度和干扰离子对反应速率的影响，讨论了催化反应的机理。在不同温度条件下，测定钼的线性范围是０．１～１．５ｍｇ·Ｌ－１，检出限是１．２×１０－２ｍｇ·Ｌ－１相对标准偏差是２．４％，催化反应的表现活化能是４４．７ｋＪ·ｍｏｌ－１．方法用于测定豆样品中痕量钼。     

左西替利嗪的合成

以4-氯二苯甲酮为原料,经Leuckart反应、酸解、拆分、环合、酸解、缩合、缩合及成盐酸盐7步反应合成左西替利嗪,总收率为5.0%.对合成化合物5的去酸剂进行了考察,选用价廉的三正丙胺代替文献中二异丙基乙胺,所得产物收率接近文献收率.     

Studies on the Synthesis and Electron Spectra of 2,6-Bis(p-Aminophenyl)Benzo[1,2-d;5,4-d'''']Bisoxazole

0　IntroductionBenzoxazolesareaveryinterestinggroupofaromatichetero cycliccompoundsbecauseoftheiropticalapplicationssuchasphotoluminescents,whiteningagents,laserdyeandfluorescentprobes[1 ,2 ] .Furthermore,thebenzoxazoleunitsareusefulforotherimportantcasessuchasintermediatesfororganicsynthesesandtherapeuticmaterials[3] .Recently ,muchresearchhasbeenfocusedonintroducinganaromaticbenzoxazoleorbenzobisoxazoleunitintononlinearopticalmaterialstoimprovethermalandphoto chemicalstabilities[4 6] .Benzob…     

恩丹西酮与甲氧氯普胺预防肺癌化疗所致呕吐的疗效

目的：观察恩丹西酮预防以顺铂为主肺癌化疗所致呕吐的疗效。方法：用顺铂化疗前后5min内分别静脉用8mg恩丹西酮，次日继续用8mg；对照组则于顺铂化疗前后5min内分别静脉用甲氧氯普胺10mg，次日继续用10mg，观察两组疗效。结果：恩丹西酮组第1—3天对恶心、呕吐的控制率分别为95．7％、91．3％、87％，明显高于甲氧氯普胺组20％、35％、25％。(P＜0．01)结论：恩丹西酮预防以顺铂为主的肺癌化疗所致的恶心、呕吐控制率明显优于甲氧氯普胺。