Reaction of Phenylglyoxal with Cyclopentenylmorpholine and its Arylidene Derivatives

The reaction of phenylglyoxal with cyclopentenylmorpholine and its arylidene derivatives leads to hydroxyalkylation products.     

Significantly Enhanced Reactivities of the Nucleophilic Substitution Reactions Induced by Microwaves in Ionic Liquid

The reaction rate of nucleophilic substitution can be dramatically enhanced by microwave irradiation using the ionic liquid [Bmim]BF4 as a solvent. Nucleophilic reagents (anilines, thiophenol) react with ethoxymethylene isopropylidene malonate to give corresponding products in 5–10 min in good yields.     

Synthesis of 2-substituted 9,10-anthraquinones

A convenient preparation of racemic 2-substituted 9,10-anthraquinones that included 2-triazoylethyl skeleton 1 and 2-alkylethyl skeleton 6 is reported. The products were obtained in good yields by a three- or four-step synthetic route based on a sequence of N-bromosuccinimide (NBS)–mediated bromination of 2-ethyl-9,10-anthraquinone 2, nucleophilic substitution, and CuI-catalyzed 1,3-dipolar cycloaddition or alkylation/reductive desulfonylation.

[Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications^® for the following free supplemental resource(s): Full experimental and spectral details.]     

Decidability of the theory of modules over Prüfer domains with dense value groups

We provide algebraic conditions ensuring the decidability of the theory of modules over effectively given Prüfer (in particular Bézout) domains whose localizations at maximal ideals have dense value groups. For Bézout domains, these conditions are also necessary.     

Solid Solutions of Calcium Aluminates C3A,C12A7 and CA with Sodium Oxide

The research concerns the influence of a substantial range of sodium ion concentrations on the structure of the calcium aluminates C₃A*, C₁₂A₇ and CA until CaO is emitted. The research also shows the influence of sodium ions of the cell parameters of each calcium aluminate and what reaction occur in mixtures of Na₂O and calcium aluminates at elevated temperatures. This revised version was published online in August 2006 with corrections to the Cover Date.     

杂原子沸石的二次合成及其表征——Ⅰ.含稼Y沸石

以Y型沸石为原料,(NH_4)_3GaF_6为取代剂,进行液一固类质同晶取代反应,成功地制备出骨架含Ga的[Ga]Y系列沸石,并用化学分析、IR、XRD、DTA等多种方法进行了表征。与(NH_4)_2SiF_6对Y沸石的脱Al补Si不同,脱Al补Ga反应可以在取代剂Ga/沸石中Al(原子比)大于1.0条件下进行,沸石达到高度脱Al补Ga,但仍维持良好的结晶度,[Ga]Y的空穴浓度几无增加,部分Ga处于骨架外,不为NH_4Cl所交换,Ga进入Y沸石后,其晶胞参数增大,热稳定性下降,红外骨架振动频率向低频位移,B酸酸量减少,L酸酸量增加,且变化程度与Ga对Al的取代程度有对应关系。     

Investigation and development of environmentally friendly processes on zeolite catalysts

The synthesis of alkylphenols, alkylanilines and nitro-aromatic compounds with different substituents in the aromatic ring on highly active and selective zeolite catalysts has been studied with regard to zeolite acidity and structure. These studies open the way for solid, environmentally friendly catalysts instead of liquid ones producing harmful liquid wastes in huge amounts.     

Finiteness Theorems for Graphs and Posets Obtained by Compositions

We investigate classes of graphs and posets that admit decompositions to obtain or disprove finiteness results for obstruction sets. To do so we develop a theory of minimal infinite antichains that allows us to characterize such antichains by means of the set of elements below it.In particular we show that the following classes have infinite antichains with respect to the induced subgraph/poset relation: interval graphs and orders, N-free orders, orders with bounded decomposition width. On the other hand for orders with bounded decomposition diameter finiteness of all antichains is shown. As a consequence those classes with infinite antichains have undecidable hereditary properties whereas those with finite antichains have fast algorithms for all such properties.     

替代价格可变的两产品库存问题研究

从销售商的角度出发,研究了可变替代价格下的两产品库存问题.假设随机需求服从均匀分布,得到了一些有益的结论,并通过数值计算说明了各参数的变化对最优订货量和替代价格的影响.