FeCl3-catalyzed propargylation of aromatic compounds with propargylic acetates

A new method for the synthesis of propargylated aromatic compounds is developed. The reaction was carried out at room temperature in the presence of a catalytic amount of FeCl₃ in acetonitrile, high product yields were obtained with excellent regioselectivity and the reaction proceeded smoothly without exclusion of moisture or air.     

Retention characteristics of alkylated polycyclic aromatic hydrocarbons in normal phase liquid chromatography

Summary Retention characteristics of series of polymethyl and mono-n-alkyl derivatives of benzene and pyrene, and also of parent polycyclic aromatic hydrocarbons (PAH), were studied using silica and aminopropyl- and cyanopropyl-modified silica. Differences in the selectivities for the studied compound groups were found between the three phases. Deviations from linear behaviour in plots of log (k′)vs. carbon number were observed for the methyl series. These are explained in terms of differences in π-electron delocalisation within the aromatic ring systems. Further, the effect of methyl substitution on selectivity decreased with an increasing number of aromatic rings. Results were obtained which indicated that the primary adsorption site in a cyano column used in normal phase mode, at least for PAH molecules, is the cyano group.     

Convenient synthesis of 12H-benzo[a]xanthenes from 2-tetralone

Convenient and facile syntheses of 12H-benzo[a]xanthenes from 2-tetralone and 2-hydroxyaromatic aldehydes is described. 2-Tetralone reacted with 2-hydroxyarylaldehydes to yield 12H-benzo[a]xanthenes under acidic conditions.     

Compatibility and universality of the retention prediction system for polycyclic aromatic hydrocarbons in reversed-phase liquid chromatography

Summary System-compatibility and universality of the retention prediction concept has been investigated for polycyclic aromatic hydrocarbons in reversed-phase liquid chromatography. The results clearly indicate that the retention prediction approach has a very high potential for optimization of separation conditions in almost all reversed-phase systems, and allows more precise and rapid analysis. This approach may be one of the best optimization techniques, because the system does not require any standard materials.     

A Facile Route to Unsymmetrical Sulfide

Unsymmetrical sulfides can be generated by the reaction of chlorine substituted aromatic compounds in sulfoxide in the presence of fluorine anion in fair yield.A likely mechanism was proposed.     

伊敏煤田伍牧场矿区煤中多环芳烃分布特征

伊敏煤田伍牧场矿区储藏着丰富的煤层，有从褐煤至瘦煤连续变化的系列煤样。对该煤系样品索氏抽提物中芳烃馏分进行ＧＣ／ＭＳ分析，取得从萘系至ｍ／ｅ４９６分子量的一个系列的芳烃分布数据。煤中多环芳 鉴定是通过气相色谱的保留指数，质量色变和质谱多个方面考证而定出本系列样品中５７个化合物的同系物。     

An efficient synthesis of substituted benzene-1,2-dicarboxaldehydes

Substituted-benzene-1,2-dicarbaldehydes were synthesized by the reaction of substituted-1,2-bis(dibromomethyl) benzenes with fuming sulfuric acid,followed by hydrolysis. The yields were signifi-cantly improved by introducing solid sodium bicarbonate into the reaction mixture before hydrolysis and workup.