Improvement of Dispersion and Release Properties of Nifedipine in Suppositories by Complexation with 2-Hydroxypropyl-β-cyclodextrin

Geometries, electronic properties and NMR-shielding of cucurbit[5]uril, decamethylcucurbit[5]uril, cucurbit[6]uril, cucurbit[7]uril, and cucurbit[8]uril are investigated with DFT calculations. All molecules are highly symmetrical with a distinct geometric flexibility. In addition with a characteristic partial charge distribution these findings account for their chemical complex building ability.     

KF－Al2O3催化下3，4－二氢－2H－吡喃[3,2-h]喹啉衍生物的合成

芳醛、8－羟基喹啉与丙二腈或氰乙酸乙酯KF－Al2O3催化下反应生成一系列新 的3，4－二氢－2H－吡喃[3,2-h]喹淋衍生物，产物的结构通过单晶X射线确证。     

铒离子及其阳离子卟啉配合物对金黄色葡萄球菌生长的抑制和刺激作用

用微量热法研究了Er³⁺、TMP{TMP=5，10，15，20-四(4-甲氧基苯基)卟啉}及其阳离子铒卟啉配合物[Er(TMP)(H₂O)₃]Cl对金黄色葡萄球菌生长作用的生物热动力学特征，求算了在Er³⁺、TMP和[Er(TMP)(H₂O)₃]Cl作用下，金黄色葡萄球菌生长的热动力学参数。实验结果表明：TMP对金黄色葡萄球菌生长的作用表现为单向的抑制作用，而Er³⁺和[Er(TMP)(H₂O)₃]Cl对金黄色葡萄球菌的生长有双向调节作用。在低浓度下，Er³⁺对金黄色葡萄球菌生长的刺激作用强于[Er(TMP)(H₂O)₃]Cl；在较高浓度下，[Er(TMP)(H₂O)₃]Cl对金黄色葡萄球菌生长的抑制作用显著强于Er³⁺。对金黄色葡萄球菌的抗菌活性为：[Er(TMP)(H₂O)₃]Cl>>TMP>Er³⁺。对相互作用机理做了初步探讨。     

A Facile Synthesis of Ethyl 2,4-Dimethoxy-6-perfluoroalkyl-benzoates via Acyclic Precursors

Introduction Polysubstituted arenes are important intermediates in synthetic medicines and dyestuffs, and the fluorinated analogues are more attractive as a result of their lipo-philicity and the increment of activity.1,2 Therefore, to study the convenient and efficient synthesis of polysub-stituted arenes is valuable in organic synthetic method-ology. We have designed a simple synthesis of fluori-nated polysubstituted arenes through the intramolecular Wittig reaction of a new phosphorous ylid…     

杯芳烃的配位化学──Ⅳ.对叔丁基杯[8]芳烃与钙、镉配合物的合成与表征

本文合成了对叔丁基杯[8]芳烃(H₈L)与钙、镉的固体配合物。并以元素分析、核磁共振、热谱、红外谱、紫外谱等进行表征。其配合物的组成分别为Ca(H₆L)·6dmf及Cd(H₆L)·6dmf.     

碳化钨负载S2O8^2-/ZrO2固体超强酸催化剂上的正戊烷反应研究

首次研究了碳化钨负载S2 O2 -8 ZrO2 (PSZ)固体超强酸催化剂 (WC PSZ)上正戊烷的反应情况及影响催化剂活性的各种因素 ,并用GC MS ,XRD ,BET等手段分析了正戊烷反应产物和催化剂的物理化学性质等 .结果表明 :WC PSZ对正戊烷具有异构化和裂解的双重催化作用 .PSZ在负载适量碳化钨后对正戊烷反应的活性和选择性显著提高 ,显示出优于Pt PSZ催化剂的效果 ,碳化钨的负载量为 2 0 %的效果最佳 .适当的焙烧、活化和反应温度等条件是取得良好反应效果的关键     

Synthesis and structure of novel derivatives of thieno[2,3-b]thiocine. An unusual product of intramolecular cycloaddition of 2-homomethallylthio-5-methyl-3-thiophenecarbonitrile oxide

9-Methyl-3,3a,4,5-tetrahydro-6H-thieno[2,3-b]thiocino[4,5-c]isoxazole and 9-hydroxyimino-2-methyl-7-methylene-6, 7,8,9-tetrahydro-5H-thieno[2,3-b]thiocine have been prepared for the first time by the oxidation of 2--alkenylthio-3-thiophenecarbaldoximes with NaOCl. X-ray structural investigations of thieno[2,3-b]thiocine and 2-homomethallylthio-5-methyl-3-thiophenecarbaldoxime have been carried out.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1262–1266, July, 1993.     

Tributyltin hydride-mediated straightforward synthesis of a new isoxazolo-benzazulene ring system

Tributyltin hydride-mediated straightforward synthesis of a new isoxazolo-benzazulene system from the derivatives afforded by the Baylis-Hillman reaction of 3-(2-bromophenyl)-4-isoxazolecarbaldehydes is described.     

Reductive coupling of polyfunctionalized organobismuth and organolead arylating reagents in the synthesis of benzopyran derivatives

Benzopyran derivatives were synthesized in good yields by the reactions of tris[2-(chloromethyl)phenyl]bismuth diacetate and 2-(halomethyl)aryllead triacetates with phenols and naturally occurring 4-hydroxycoumarins in the presence of bases according to a three-step one-pot procedure. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2520–2529, November, 2005.     

Development of a Novel Approach to Formation of a Pyrrole Ring: Synthesis of 2,3,5-Substituted 1-[2-(Vinyloxy)ethyl]pyrroles

Reaction of 2-(vinyloxy)ethylisothiocyanate with unsaturated carbanions generated in situ from propargyl ethers and amines when treated with superbases, after S-alkylation and cyclization of the adducts in the presence of CuBr, leads to the previously unknown 2,3,5-substituted 1-[2-(vinyloxy)ethyl]pyrroles.