7-芳基-10-芳基(甲基)-8, 9, 10, 11-四氢苯并[c]吖啶酮-8的 合成

本工作合成了一系列尚末见报道的四环系苯基并吖啶酮类化合物。     

E/Z-焦脱镁叶绿酸-a 甲酯131-酮肟的合成及其烷(酰)基化反应

以焦脱镁叶绿酸-a 甲酯(MPP-a)为起始原料,通过E环羰基与盐酸羟胺反应,生成Z/E顺反结构的焦脱镁叶绿酸-a 甲酯酮肟异构体,分离后与酰卤和卤代烷反应,分别生成Z或者E型O-烷酰基酮肟和O-烷基酮肟.所合成新的二氢卟吩衍生物均经UV, IR, 1H NMR, 13C NMR及元素分析证实其结构.     

Synthesis of isochroman-fused pyrazolone and pyrimidine derivatives

Unsubstituted 5 , and 2-aryl- 6a-c , or 2-(2-benzothiazolyl)-substituted 1,3-dihydroisochromano[4,3-c]pyrazol-3(2H)-ones 7a-f were prepared by the reactions of 3-ethoxyoxalyl- 2 , or 3-ethoxycarbonylisochroman-4-one 3 with hydrazine derivatives. The reactions with amidines gave 2-substituted 4-hydroxyisochromano[4,3-d]-pyrimidines 8a-c .     

苯并[a]蒽在TiO2颗粒表面的多相光化学反应

利用原位漫反射红外光谱(DRIFTS)并结合气相色谱-质谱(GC-MS)分析研究了苯并[a]蒽(B[a]A)在TiO₂颗粒气固界面的光化学反应过程. 结果表明, 在氙灯照射下, 苯并[a]蒽在TiO₂颗粒气固界面发生光催化反应, 表面羟基和表面氧参与了光催化反应, 主要产物为苯并[a]蒽-7,12-二醌, 根据分析结果给出了苯并[a]蒽在TiO₂颗粒表面的光化学反应机理模型. 在模拟太阳光(22 mW·cm^-2)照射下, 苯并[a]蒽在TiO₂颗粒表面的光降解过程符合指数衰减方程, 半衰期为6.8 min.     

具有叶绿素-a碳架的(细菌)卟吩衍生物的合成及其共轭区域变化对光谱性能的影响

以脱镁叶绿酸-a甲酯(MP-a) (1)为起始原料, 通过四氧化锇和高碘酸钠的氧化给出3-位乙烯基和13²-位α-氢的氧化产物2和3, 再用四氧化锇继续氧化卟吩醛2则得到细菌卟吩醛4. 经脱甲酸甲酯和硝酸铊氧化, MP-a (1)转化为焦脱镁叶绿酸衍生物5, 将其进一步用四氧化锇氧化则形成细菌卟吩缩醛6. 卟吩醛2在碱性条件下转化为卟吩e₆三甲酯7, 2与烷基溴化镁的格氏反应给出脱镁叶绿酸醇9, 选择高钌酸四丙基铵(TPAP)和N-甲基吗啉N-氧化物将3-位羟基氧化成羰基, 所生成的卟吩二酮10在酸性条件下脱去甲酸甲酯生成焦脱镁叶绿酸衍生物11, 用四氧化锇对7和11实施氧化, 则分别转化为细菌卟吩衍生物8和12. 同时, 讨论了叶绿素衍生物的共轭区域变化对其光谱性能的影响. 所合成的新卟吩和细菌卟吩衍生物均经UV, IR, ¹H NMR及元素分析证明其结构.     

Influence of Soil Moisture and Vegetation on Climate (Ⅱ)——Numerical Experiments on Persistence of Short-term Climatic Anomalies

Numerical experiments on the influence of soil moisture and vegetation on the persistence of short-term climatic anomalies are performed with a vertical one-dimensional climate model in the atmosphere-soil-vegetation system.The experimental results indicate that, as shown by theoretical analysis in Part Ⅰ of this paper,soil hydrology is crucially important for maintenance of short-term climatic anomalies over land areas. Possible physical process concerned with impact of soil moisture and vegetation on the persistence is further discussed.     

环稠卟啉合成的研究进展

利用卟啉大环的碳架组成及其连带成分进行各种环合反应是构建环稠卟啉分子的有效方法. 基于这一合成策略, 概述了近年来通过卟啉分子的结构修饰完成环稠卟啉合成的最新研究进展.     

Rapid analysis of svoc in aerosols by desorption electrospray ionization mass spectrometry

Desorption electrospray ionization mass spectrometry (DESI-MS) was applied for the first time to the analysis of semivolatile organic compounds (SVOC) in atmospheric aerosols. We took polycyclic aromatic hydrocarbons (PAHs) as representatives of SVOCs. The DESI-MS conditions were optimized and the limit of detection for PAHs was about 10 pg with 5 s sampling time. PAHs from both laboratory-made biomass burning aerosols and ambient aerosols were selectively and rapidly analyzed without extraction or preconcentration. The observed PAH species and their relative ion intensities are discussed. This work demonstrates that DESI-MS is a promising method for rapid semiquantitative analysis of SVOC in atmospheric aerosols.     

Broadband Infrared Luminescence from Bismuth-Doped GeS2--Ga2S3 Chalcogenide Glasses

Near-infrared luminescence is observed from bismuth-doped GeS2-Ga2Sa chalcogenide glasses excited by an 808 nm laser diode. The emission peak with a maximum at about 1260 nm is observed in 80GeS2-2OGa2 Sa：O.fBi glass and it shifts toward the long wavelength with the addition of Bi gradually. The full width of half maximum （FWHM） is about 200 nm. The broadband infrared luminescence of Bi-doped GeS2-Ga2Sa chalcogenide glasses may be predominantly originated from the low valence state of Bi, such as Bi＋. Raman scattering is also conducted to claxify the structure of glasses. These Bi-doped GeS2 Ga2Sa chalcogenide glasses can be applied potentially in novel broadband optical fibre amplifiers and broadly tunable laser in optical communication system.     

GrÖbner基推广及Z/(m)上多条序列综合算法

将GrÖbner基推广到环(Z/(P^e)[x₁,…,x_n])/I上,p是素数,e≥1,I是Z/(P^e)[x₁,…,x_n]的理想,应用推广的GrÖbner基理论,给出了环Z/(m)上多条序列的综合算法,算法复杂性是O(N²).