苯氧基乙酸,(苯硫基)乙酸和(苯基硒代)乙酸的质子电离热已使用石英温度计通过差示反应量热计进行了测量。已经证明酸度的变化取决于焓的变化,熵的变化大致保持恒定。通过测量0–40°范围内的形成常数,可以计算出形成酸的银络合物以及许多取代的(苯硫基)乙酸和(苯基硒代)乙酸的银络合物的热力学常数。稳定性顺序Se> S O已被证明是由于更有利的焓变化所致,而熵的变化则与复合物的形成相反。
Ligands containing elements of Group VIB. Part I. The silver complexes of substituted phenylthioacetic acids
作者:L. D. Pettit、A. Royston、R. J. Whewell
DOI:10.1039/j19680002009
日期:——
The stability constants of the silvercomplexes of 21 substitutedphenylthioaceticacids (HL) of general formula R·C6H4·S·CH2·CO2H have been measured, using a silver–silver chloride indicator electrode with a mercurous sulphate reference electrode, at 20·0° in a sodium acetate–acetic acid buffer solution (µ= 0·10M). Stability constants for the complex species AgL, AgHL+(µ= 0·20M), and AgL2– are calculated
Metallation reactions. Part 35: A change of the regiochemistry in the metallation of (alkylthio)arenes
作者:Maria G Cabiddu、Salvatore Cabiddu、Enzo Cadoni、Stefania De Montis、Claudia Fattuoni、Stefana Melis
DOI:10.1016/j.tet.2004.02.069
日期:2004.4
The metallationreaction of bromo(alkylthio)benzenes is described. The results show the complementarity of these reactions with the metal–hydrogen exchange reaction. In fact, monometallation of bromo(methylthio)benzenes afforded products substituted in para or meta or ortho to the thioethereal function while bimetallation led to αS,para, αS,meta and αS,ortho disubstituted products. Analogously, the
[EN] PLEUROMUTILIN DERIVATIVES, PROCESS FOR THEIR PREPARATION AND USES THEREOF<br/>[FR] DERIVES DE PLEUROMUTILINE, LEUR METHODE DE PREPARATION ET LEURS UTILISATIONS
申请人:GLAXO GROUP LTD
公开号:WO2004089886A1
公开(公告)日:2004-10-21
Pleuromutilin compounds of the formula (IA), (IB) are of use in antibacterial therapy.