Excess enthalpies of alcohol + amine mixtures. Experimental results and theoretical description using the ERAS-model

New experimental data of the molar excess enthalpy H^E of mixtures containing eight liquids - propylamine + methanol, ethanol, propan-1-ol, butan-1-ol, butylamine + methanol, ethanol, propan-1-ol, butan-1-ol - are presented using a quasi-isothermal flow calorimeter. The results are used for testing the ERAS-model which provides a theoretical concept accounting for the self-association and cross-association of alcohol and amine molecules, as well as for non-associative intermolecular interactions. Excess molar volumes V^E are also successfully described by the model. It turns out that the strong cross-association occurring between alcohol and amine molecules is the predominant reason for the remarkably low exothermic values of H^E observed for the mixtures studied.     

实验性酒精性肝病血浆内皮素浓度的变化

为探讨内皮素（ＥＴ）在酒精性肝病中的作用，本实验采用每日分次灌胃的方法建立了酒精性肝病的大鼠模型，采用放射免疫技术动态测定酒精性肝病大鼠和正常大鼠血浆中内皮素浓度的变化。结果：酒精喂饲的大鼠其血浆内皮素浓度明显高于相应的正常对照组，而且随着酒精性肝病病变程度的加重，内皮素浓度也相应升高。结论：内皮素水平的升高可能与酒精性肝损伤有关，因为内皮素有强大的缩血管作用，可使肝血流减少，而这是酒精性肝病的发病的发病机制之一。     

Die Trifluormethansulfonate der Dimethylsilylether als Zwischenstufen für Silylschutzgruppen

Summary The reaction of mesityldimethylsilyl ethers with CF₃SO₃H yields selectively mesitylene. The resulting Si-trifluormethanesulfonates were reacted witht-BuLi to give the correspondingt-BuMe ₂Si-ethers.