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半联胺重排机理
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作者 许家喜 《大学化学》 CAS 2020年第7期1-7,共7页
半联胺通常是N,N’-二芳基肼在酸性条件下发生联苯胺重排反应时的副产物,包括邻半联胺和对半联胺。在某些情况下,如取代芳基的N,N’-二芳基肼重排的主要产物为邻半联胺和对半联胺。关于半联胺重排反应的机理,曾提出过π络合物过渡态机... 半联胺通常是N,N’-二芳基肼在酸性条件下发生联苯胺重排反应时的副产物,包括邻半联胺和对半联胺。在某些情况下,如取代芳基的N,N’-二芳基肼重排的主要产物为邻半联胺和对半联胺。关于半联胺重排反应的机理,曾提出过π络合物过渡态机理、环己二烯正离子中间体机理和氯离子桥链的双阳离子型自由基对中间体机理,但通过动力学同位素效应、理论计算和实验结合研究确定该重排反应是构型翻转的N[1,3]σ迁移反应为关键步骤的周环反应。本文介绍了半联苯胺重排反应机理的研究历程及其代表性的实例。 展开更多
关键词 σ迁移 重排 N[1 3]σ迁移 半联胺 二芳基肼 构型翻转
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多胺桥联聚倍半硅氧烷/壳聚糖蛇-笼型复合材料的制备及其对Au(Ⅲ)的吸附性能研究
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作者 巩相君 金梦 +3 位作者 赵志平 孙昌梅 曲荣君 张盈 《鲁东大学学报(自然科学版)》 2024年第1期1-8,75,共9页
本研究以3-氯丙基三甲氧基硅烷(CPTS)、乙二胺(EDA)和二乙烯三胺(DETA)为原料,制备两种单体B-DETA-m和B-EDA-m,然后将桥联单体与不同比例壳聚糖(CTS)反应,合成了EDA/CTS和DETA/桥联聚倍半硅氧烷(BPS)两个系列蛇-笼型复合材料。对复合材... 本研究以3-氯丙基三甲氧基硅烷(CPTS)、乙二胺(EDA)和二乙烯三胺(DETA)为原料,制备两种单体B-DETA-m和B-EDA-m,然后将桥联单体与不同比例壳聚糖(CTS)反应,合成了EDA/CTS和DETA/桥联聚倍半硅氧烷(BPS)两个系列蛇-笼型复合材料。对复合材料进行了红外光谱、比表面积及孔隙度分析、扫描电镜等表征,考察了复合材料对Au(Ⅲ)的吸附性能。结果表明,CTS的加入能够有效提高材料的吸附性能,其中拥有较丰富孔隙度和较大比表面积的EDA/CTS-30和DETA/CTS-30对Au(Ⅲ)吸附能力最强。本研究为含CTS和BPS的新型吸附剂、色谱柱等材料的研发提供了理论依据,可应用于污水处理,对后续环境治理研究具有积极意义。 展开更多
关键词 聚倍硅氧烷 壳聚糖 蛇-笼型复合材料 吸附 Au(Ⅲ)
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Observation on clinical therapeutic efficacy of moxibustion combined with mecobalamin on diabetic perineuropathy and effects on patients' blood homocysteine 被引量:6
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作者 熊志峰 胡玲 《World Journal of Acupuncture-Moxibustion》 2014年第1期15-18,共4页
Objective To observe the therapeutic efficacy of moxibustion combined with mecobalamin on diabetic perineuropathy and the effects on blood homocysteine in pa ents with diabe c perineuropathy. Methods One hundred and f... Objective To observe the therapeutic efficacy of moxibustion combined with mecobalamin on diabetic perineuropathy and the effects on blood homocysteine in pa ents with diabe c perineuropathy. Methods One hundred and fifty patients with diabetic perineuropathy meeting with the inclusive criteria were randomized into a moxibus on group,a mecobalamin group and a therapeutic alliance group by using random digits table. Moxibustion was carried out on Tàixī(太溪 KI 3),Sānyīnjiāo(三阴交 SP 6),Zúsānl?(足三里 ST 36),Hég?(合谷 LI 4) and Qūchí(曲池 LI 11) for the patients in the moxibustion group,the treatments were carried out once every other day,treatments for ten mes were considered as a treatment course,and totally three treatment courses were carried out. The pa ents in the mecobalamin group were orally administered with mecobalamin tablet 500 μg once,three times a day,20 days were considered as a treatment course,and totally three treatment courses were carried out. Moxibustion was carried out on the basis of oral administration with mecobalamin tablet in the therapeutic alliance group. The clinical symptoms,nerve conductive velocities and changes in blood homocysteine were observed before and after the treatments in the three groups. Results The total eff ec ve rate in the moxibus on group was 74.0%(37/50),82.0%(41/50) in the mecobalamin group,94.0%(47/50) in the therapeutic alliance group,and the total effective rate in the therapeutic alliance group was significantly be er than the other two groups(P0.01). The nerve conductive velocities in the mecobalamin group and the therapeutic alliance group after the treatments were significantly increased and the blood homocysteine level decreased in comparison to those before the treatments(P0.01),while the nerve conductive velocity increased and the blood homocysteine level decreased in the therapeutic alliance group after the treatments in comparison to those in the other two groups(P0.01). Conclusion Treatments on diabe c perineuropathy by therapeu c alliance of moxibustion and mecobalamin can not only improve symptoms of patients,increase nerve conduc ve velocity in aff ected limbs,but also decrease blood homocysteine level. The method is simple,economical and safe,and it deserves being generalized in clinical prac ces. 展开更多
关键词 diabetic perineuropathy therapeu c alliance of moxibus on and mecobalamin HOMOCYSTEINE moxibus on therapy
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