1,3-二羟基丙酮衍生物的合成

以五氧化二磷为引发剂 ,二甲亚砜氧化 1,3 二芳氧基 (烷氧基 ) 2 丙醇化合物合成了一系列 1,3 二羟基丙酮衍生物 .通过IR和1HNMR对化合物进行了表征     

Meso位单取代卟啉及其配合物的合成、表征和光谱性质

设计合成了一系列新型的meso位N,N-二甲氨基苯基或N-苯基咔唑基单取代卟啉(5a~c)及其锌配合物(6a~c),用高分辨质谱、¹H NMR、紫外-可见光谱及X射线单晶衍射方法等对结构进行了表征;研究了卟啉化合物及其配合物的热稳定性及荧光性质。结果表明,这些卟啉化合物及其锌配合物在400~410 nm之间具有强的吸收且具有很好的热稳定性,荧光量子产率在0.05~0.09;另外还分析了meso位不同取代基对光谱性质的影响。     

混合植物甾醇中豆甾醇和β-谷甾醇的高效液相色谱分析

应用高效液相色谱对豆甾醇、β_谷甾醇和重结晶法分离精制的混合甾醇进行了分析测定 ;实验采用的色谱柱为HypersilODS反相柱(4.6×150mm ,5μm) ,流动相为甲醇 ,紫外检测波长为210nm ,恒溶剂洗脱 ,混合植物甾醇在10min内得到了很好的分离 ;实验结果表明 ,采用液相色谱法能够快速准确地测定混合甾醇中豆甾醇和 β_谷甾醇的含量。     

2，4，6-三〔芳基氨基)-1，3，5-三嗪衍生物的合成方法和微波效应研究

用碳酸氢钠作扑酸剂，将芳香胺和氰尿酰氯在1，4-二氧六环中回流状态下反 应合成了7个2，4，6-三(芳基氨基)-1，3，5-三嗪衍生物，其中6个是新化合物． 与已有文献报道的方法相比，条件温和，易于操作，收率高．所合成化合物的结构 通过元素分析，FAB-MS，IR确定．在二氧六环：DMF为10：3(V：V)的混合溶剂中， 研究了在微波照射下和常规加热下反应速率的差异．结果表明，微波加热比常规加 热下的反应速率至少高10倍以上．     

细胞色素c在微-液/液界面上电化学行为的研究

本文采用电化学技术,研究了细胞色素c（Cyt c）在玻璃微米管尖端处形成的微-水/1,2-二氯乙烷（W/DCE）界面上的电化学行为.选用四丁基铵四苯硼（TBAT-PB）、四丁基铵四氯代苯硼（TBATPBCl）以及四丁基铵四氟代苯硼（TBATPBF）三种不同的有机相支持电解质来研究Cyt c在W/DCE界面上的反应.在电势窗较窄的含TBATPB体系中只能够观察到吸附过程;在电势窗较宽的含TBATPBCl和TBATPBF的体系中,可以同时观察到吸附与离子转移过程.当Cyt c浓度较低时,两种过程都可以观察到;当Cyt c浓度较高时,主要是吸附.文中对这些过程的机理进行了探讨.     

Recent Advances of Pure Organic Room Temperature Phosphorescence Materials for Bioimaging Applications

Bioimaging,as a powerful and helpful tool,which allows people to investigate deeply within living organisms,has contributed a lot for both clinical theranostics and scientific research.Pure organic room temperature phosphorescence(RTP)materials with the unique features of ultralong luminescence lifetime and large Stokes shift,can efficiently avoid biological autofluorescence and scattered light through a time-resolved imaging modality,and thus are attracting increasing attention.This review classifies pure organic RTP materials into three categories,including small molecule RTP materials,polymer RTP materials and supramolecular RTP materials,and summarizes the recent advances of pure organic RTP materials for bioimaging applications.     

核苷研究Ⅸ3-甲硫基-7-氧代吡唑并(5,4-e)-1,2,4-三嗪核苷合成研究

对3-甲硫基-7-氧代吡唑并(5,4-e)-1,2,4-三嗪的成苷反应进行了研究。当保护基为乙酰基时,生成的核昔β-体为主产物。当保护基为苯甲酰基时全部是β-体。端应构型用~1H NMR确定。在五元环中,顺位质子比反位质子裂分常数大。     

Study of the heavy ion bunch compression in CSRm

The feasibility of attaining nanosecond pulse length heavy ion beam is studied in the main ring （CSRm） of the Heavy Ion Research Facility in Lanzhou. Such heavy ion beam can be produced by non-adiabatic compression, and it is implemented by a fast rotation in the longitudinal phase space. In this paper, the possible beam parameters during longitudinal bunch compression are studied with the envelope model and Particle in Cell simulation, and the results are compared. The result shows that the short bunch ²³⁸U²⁸⁺ with the pulse duration of about 50 ns at the energy of 200 MeV/u can be obtained which can satisfy the research of high density plasma physics experiment.     

Stereoselective total synthesis of (±)-peribysin E

Radical cyclization of iodoketone 3 afforded cis-hydrindanone 8. Compound 8 was converted into key intermediate 5 via conventional transformations. Annulation of a spiro-lactal unit to 5 was pursued with three different approaches. In the first approach, radical cyclization of propargyl ester 17 provided spiro-lactone 18 with an undesired stereochemistry. Attempts to invert the stereochemistry at the spiro-center via retro-aldol and aldol condensation of compound 20 failed. In the second approach, key intermediate 5 was transformed into 23. Acylation of compound 23 gave 24 as a single diastereomer with the desired stereochemistry but in low yield. NBS bromination of 24 followed by lactone formation gave 26 in low yield. Alternatively, allylic oxidation of 24 with SeO(2) followed by lactonization gave 26 also in low yield. Finally, a third approach employing a semipinacol-type rearrangement of epoxy-alcohol 33 gave aldehyde 34 with the desired stereochemistry. Treatment of compound 34 with HCl in MeOH effected spiro-lactal formation and provided (±)-peribysin E. The overall yield of our synthesis is 3.2% from 2-methylcyclohenen-1-one.     

有时序的多属性席位分配模型及其应用

将经典席位分配模型推广到有时序多属性席位分配模型,给出了有时序多属性席位分配模型一个简单有效的算法.最后应用实例说明有时序多属性席位分配模型应用更加广泛和合理.