Thermal and Structural Study of the Crystal Phases and Mesophases in the Lithium and Thallium(I) Propanoates and Pentanoates Binary Systems: Formation of Mixed Salts and Stabilization of the Ionic Liquid Crystal Phase
作者:F. J. Martínez Casado、M. Ramos Riesco、I. da Silva、A. Labrador、M. I. Redondo、M. V. García Pérez、S. López-Andrés、J. A. Rodríguez Cheda
DOI:10.1021/jp1031702
日期:2010.8.12
The temperature and enthalpy vs composition phase diagrams of the binary systems [xC2H5CO2Li + (1 − x)C2H5CO2Tl], and [x(n-C4H9CO2Li) + (1 − x)n-C4H9CO2Tl], where x is the molefraction, were determined by DSC. Both binary systems display the formation of one 2:1 mixed salt each (at x = 0.667) that appear as a peritectic (incongruent melting) at Tfus = 512.0 K, and Tfus = 461.1 K, with ΔfusHm = 13
二元体系[ x C 2 H 5 CO 2 Li +(1- x)C 2 H 5 CO 2 Tl]和[ x(n -C 4 H 9 CO 2 Li)的温度和焓与组成相图通过DSC确定+(1- x)n -C 4 H 9 CO 2 T1],其中x是摩尔分数。两种二元系统均显示一种2:1混合盐的形成(在x处= 0.667)在T fus = 512.0 K和T fus = 461.1 K时表现为包晶(不均匀熔化),对于Li-Tl(I)丙酸酯而言,Δfus H m = 13.76和8.08 kJ·mol -1,并且正戊酸酯混合盐。正戊酸al (I)的热致液晶转变为更稳定的液晶相,该相出现在380至488 K的相图中,对于x = 0直至x= 0.56。丙酸al(I)和两种混合盐的晶体结构是通过X射线同步加速器辐射衍射测量获得的。这些化合物具有类似于我们小组先前发现的两种纯锂盐的双层结构。
A Practical Synthesis of Lithium 3-Fluoropyridine-2-carboxylate
作者:Khateeta M. Emerson、Robert D. Wilson、Michael S. Ashwood、Derek J. Kennedy、David Hands、Karel M. J. Brands、Ian F. Cottrell、Ulf-H Dolling
DOI:10.1081/scc-120026852
日期:2003.12.31
A practical and efficient method for the preparation of lithium 3-fluoropyridine-2-carboxylate as well as its four regioisomer is described. 3-Fluoropyridine can be regioselectively lithiated on C-2 or C-4 depending on the reaction conditions. A quench procedure with carbon dioxide was developed which conveniently provides the lithium carboxylate in high yield and purity.
Process for mono-, di-, trisubstituted acetic acids
申请人:Warner-Lambert Company
公开号:US05041640A1
公开(公告)日:1991-08-20
An improved process for the preparation of mono-, di-, or trisubstituted acetic acids including 5-(2,5-dimethylphenoxy)-2,2-dimethylpentanoic acid by a novel synthesis is described where a carboxylic acid is converted to a soluble metalated magnesium or zinc carboxylate containing a ligand and subsequent alkylation of this intermediate in the presence of an alkali amide to afford the desired product in two steps.