手性胶束的不对称诱导作用不对称苯偶姻缩合反应

胶束体系是模拟酶的简单模型之一。手性胶束对反应有手性诱导作用。在表面活性剂(1R，2S)-(-)-N-十二烷基-N-甲基麻黄素溴化物和(1R，2S)-(-)-N-十六烷基-N-甲基麻黄素溴化物形成的胶束体系中进行的苯偶姻缩合反应，生成了光学活性的α-羟基酮。     

有机金属化合物降低柴油机炭烟排放及其机理的研究

在直喷式柴油机上按自由加速法进行了柴油机炭烟排放试验，考察了8种有机金属化合物降低炭烟排放的效果，并对其作用机理进行了研究。实验表明，8种有机金属化合物均能有效降低炭烟排放，降烟效果顺序为二壬基萘磺酸钡>二茂铁>环烷酸铁>石油磺酸钡>环烷酸锰>环烷酸铜>环烷酸钡>环烷酸铈。在纯柴油中添加4‰二壬基萘磺酸钡时，降低炭烟排放40.7%；添加1‰二茂铁时，降低炭烟排放35.3%。试验还表明，有机结构影响有机金属化合物的降烟效果，同时影响着它在添加量上的感受性。炭烟的生成，主要与生成的乙炔（C2H2）和多环芳香烃（PAH）有关，而炭烟的氧化则与炭烟周围氧浓度和炭烟颗粒表面积有关。多数有机金属化合物本身携氧，能使燃油迅速分解生成CO，CO的增加使PAH明显减少，从而抑止炭烟的生成。茂型金属有机物能活化CO分子，进而有效抑止炭烟先导物的生成。     

Chemoselective Dehydrogenation of 3-[2-（3,4-Dihydro-1-naphthalenyl）ethyl]imidazolidine-2,4-diones： a New and Convenient Synthesis of 13,16-Diazaequilenin analogs

The synthesis of the title compounds starting with the chemoselective dehydrogenation of 3-[2-(3,4-dihydro-1-naphthalenyl)ethyl]imidazolidine-2,4-diones has been described.     

Characterization of Nested Hollow Inorganic Fullerene-like Tungsten Disulfide Nanoparticles Prepared by Solid-Gas Reaction

Non-carbon inorganic fullerene-like(IF) nanoscale materials have recently attracted intense interest due to their nested hollow and nanotube structures,In this letter,IF-WS2 nanoparticles prepared by solid-gas reaction were characterized by X-ray diffraction,Scanning electron microscopy and transmission electron microscopy.The results show that the IF-WS2 nanoparticles have a nested hollow closed spherical structure with diameter of 100-150mm.     

Synthesis and Crystal Structure of 1,7,7-Trimethyl- 4-（4-methoxyphenyl）-4,6,7,8-tetrahydroquinoline- 2,5（1H,3H）-diones under Microwave Irradiation

1 INTRODUCTION Various quinolone derivatives are known to dis- play interesting biological properties ranging from microbial activity to cytotoxicity[1]. They have been reported as antiviral (HIV-1)[2] and antitumor agents[3] as well as used as tubulin[4], topoisomerase[5] and thrombocyte inhibitors[6]. As a member of the quino- lone family, substituted N-phenyl-2-quinolones re-present the structural basis of many biologically active compounds, such as protein kinase inhibitors, immunodu…     

C12-s-C12•2Br和C12En混合水溶液的胶团化行为

季铵盐二聚表面活性剂C12 s C12•2Br（s=2、3、4、6）和非离子表面活性剂C12E10或C12E23在水溶液中生成混合胶团.其临界胶团总浓度cmcT值介于二元复配体系中各组分的临界胶团浓度和之间.当添加少量非离子型表面活性剂（在水溶液中的摩尔分数α2=0.1）时,混合胶团中C12E10或C12E23的摩尔分数均已超过0.35;随着溶液中非离子型表面活性剂含量的增大,混合胶团中逐渐以C12E10或C12E23成分为主.     

Theoretical Studies on the Abstraction Reaction of Atomic O（^3p） with Si2H6

The hydrogen abstraction reaction of O(^3P) with Si2H6 has been studied theoretially. Two transition states of ^3A″ and ^3A′ symmetries have been located for this abstraction reaction. Geometries have been optimized at the UMP2 leve with 6-311G (d) basis set. G3MP2 has been used for the final single-point energy calculation. The rate constants have been calculated over a wide temperature range of 200-3000K using canonical variational transition-state sheory (CVT) with small curvature tunneling effect(SCT). The calculated CVT/SCT rate constants match well with the experimental value.     

含茂基及酰亚胺基镧系金属有机化合物的合成

在室温下由邻苯二甲酰亚胺[phthalimide, H(Pht)]与Cp3Ln在四氢呋喃溶液中反应, 合成了六个新化合物: Cp2Ln(pht),CpLn(pht)2, (Cp=cyclopentadienyl; Ln=Yb, Er, Dy;pht=phthalimido)。它们均经元素分析、红外光谱和质谱鉴定, 为非溶剂化的桥式二聚体结构。     

用硼酸作催化剂一锅法合成双（二氢化嘧啶酮-4-基）苯

A simple effective synthesis of bis(dihydropyrimidinone-4-yl)benzene derivatives, using boric acid as catalyst,from isophthalic aldehyde or terephthalic aldehyde, 1,3-dicarbonyl compounds and urea or thiourea in glacial acetic acid was described. As the expansion of the classical Biginelli reaction, this method has the advantage of excellent yields 83%-94% and short reaction time 0.5-1.5 h.