Single-stage synthesis of heterocyclic alkaloid-like compounds from (+)-camphoric acid and their antiviral activity

Molecular Diversity - An effective technique for one-stage synthesis of new polycyclic nitrogen-containing compounds has been developed. The procedure involves refluxing mixtures of camphoric acid...     

基于奖惩契约的闭环供应链协调性研究

针对由单一制造商和单一零售商组成的闭环供应链,利用奖惩契约来协调非集成模式下的供应链产品订购和回收问题.理论分析结果表明:在满足一定的条件下奖惩契约可以实现闭环供应链的协调.合适的奖惩因子能够降低零售商的批发价格,提高新产品的订购量和废旧产品回收量.最后通过数值算例验证了奖惩契约的有效性,并对回收产品废弃率和销售价格进行了灵敏度分析.     

An Adaptive Fast Interface Tracking Method

An adaptive numerical scheme is developed for the propagation of an interface in a velocity field based on the fast interface tracking method proposed in [2]. A multiresolution stategy to represent the interface instead of point values, allows local grid refinement while controlling the approximation error on the interface. For time integration, we use an explicit Runge-Kutta scheme of second-order with a multiscale time step, which takes longer time steps for finer spatial scales. The implementation of the algorithm uses a dynamic tree data structure to represent data in the computer memory. We briefly review first the main algorithm, describe the essential data structures, highlight the adaptive scheme, and illustrate the computational efficiency by some numerical examples.     

Studies in the benzodiazine series

It has been shown that when there is no substituent in position 5 of a tetrazolo[1, 5-c]quinazoline covalent hydration at the N(₆)=C(₅) bond and cleavage of the pyrimidine ring with the formation of 5-(2-aminophenyl)-tetrazole take place more readily than in the case of the 5-methyl derivative. The 5-phenyl derivative of tetiazolo[1, 5-c]quinazoline does not undergo hydration. The mechanism of the hydration of the compounds mentioned is discussed.For communication VIII, see [1].     

Cyclization of N-alkylazinium cations with binucleophiles. 8. Annellation of the imidazole ring with pyrazines and quinoxalines

Monosubstituted and N,N′-disubstituted thioureas enter into cyclization with pyrazinium and quinoxalinium ion to form imidazo[4,5-b]-annellated pyrazines and quinoxalines.     

Dipole moments,structure, and transannular interactions in silatranes containing planar fragments

The method of dipole moments and theoretical calculations (DFT B3LYP/6-31G^*) were used for structural assessment of silatranes N[CH₂(RMeC₆H₂)O]₃SiR¹ containing planar fragments in the six-membered semirings. They are endo structures with transannular N→Si interaction which involves, along with nitrogen and silicon, oxygen atoms adjacent to silicon.     

Rigid Conjugated Twisted Truxene Dimers and Trimers as Electron Acceptors

A new class of rigid twisted truxenone oligomers with an enlarged π backbone has been established by oxidative dimerization reactions. The resulting extended conjugated systems have large extinction coefficients and low‐lying LUMO levels and show good solubility in common organic solvents, thus making them attractive compounds as new electron acceptors in organic electronics. Their suitability as electron acceptors has been demonstrated in bulk‐heterojunction organic solar cells with poly({4,8‐bis[(2‐ethylhexyl)oxy]benzo[1,2‐b:4,5‐b′]dithiophene‐2,6‐diyl}{3‐fluoro‐2‐[(2‐ethylhexyl)carbonyl]thieno[3,4‐b]thiophenediyl}) (PTB7) as the donor material.     

Preparation of amorphous aluminum oxide-hydroxide nanoparticles in amphiphilic silicone-based copolymer microemulsions

Organo-inorgano nanocomposites with colloidal dimensions have interesting optical, catalytic, and mechanical properties, particularly when such hybrids are reinforced with transition metal oxide nanoparticles. Nanoparticles with a mean size of 1.0-2.4 nm are obtained through hydrolysis of aluminum isopropoxide in the L(2) phase of amphiphilic (PDMS-POE) polydimethylsiloxane-polyoxyethylene Silwet L-7607-octanol/acetylacetone-water mixtures. The particle sizes are related weakly to the microemulsion composition: 0.8-1.2 nm for 20 wt% Silwet L-7607 and 2.0-2.4 nm for 50 wt% Silwet L-7607. Protection of the particles against aggregation is ensured through their confinement in the intraaggregate colloidal domains. Factors affecting the hydrolysis-condensation process of acetylacetone-complexed aluminum isopropoxide in copolymer-poor and copolymer-rich regions of PDMS-POE W/O microemulsions are studied by Fourier transform infrared spectroscopy, small angle X-ray scattering, and transmission electron microscopy. Prepared nanoparticulate dispersions possess long-term stability and form clear mixtures in different organic polar and nonpolar solvents.     

四氢呋喃的氧化

四氢呋喃的氧化是一类重要的有机氧化反应,有关四氢呋喃的氧化研究将对其他有机物α位C-H的选择性活化提供借鉴和理论依据,同时四氢呋喃是一类重要的有机化工原料及精细化工原料,因此,四氢呋喃氧化反应的研究对有机合成和工业生产应用都有重要的意义。本文就近年来四氢呋喃氧化的研究进行了阐述,重点介绍了以氧气和过氧化氢为氧源催化氧化四氢呋喃的研究,概述了电化学方法以及其他方法在催化氧化四氢呋喃方面的研究进展,对一些重要的催化氧化方法可能的反应机理进行了讨论,并依据近年来有关四氢呋喃氧化研究的发展趋势,对今后的研究热点进行了展望。     

ChemInform Abstract: Microsolvation of Thiosulfuric Acid and Its Tautomeric Anions [HSSO3]‐ and [SSO2(OH)]‐ Studied by B3LYP‐PCM and G3X(MP2) Calculations.

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