34244-89-8Relevant academic research and scientific papers
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
Martiì?nez Casado,Ramos Riesco,Da Silva,Labrador,Redondo,Garciì?a Peì?rez,Loì?pez-Andreì?s,Rodriì?guez Cheda
, p. 10075 - 10085 (2011/01/03)
The temperature and enthalpy vs composition phase diagrams of the binary systems [xC2H5CO2Li + (1 - x)C 2H5CO2Tl], and [x(n-C4H 9CO2Li) + (1 - x)n-C4H9CO 2Tl], where x is the mole fraction, 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 ??fusHm = 13.76 and 8.08 kJ?·mol-1 for Li-Tl (I) propanoates, and n-pentanoate mixed salts, respectively. The thermotropic liquid crystal of the thallium(I) n-pentanoate transforms into a more stable liquid-crystal phase, which appears in the phase diagram between 380 and 488 K and for x = 0 up to x = 0.56. The crystal structure of thallium(I) propanoate and of the two mixed salts were obtained via X-ray synchrotron radiation diffraction measurements. These compounds present a bilayered structure similar to the two pure lithium salts previously found by our group. ? 2010 American Chemical Society.
Thallium(I) Carboxylate Modification of the Hunsdiecker Reaction
Cambie, Richard C.,Hayward, Rodney C.,Jurlina, Jeffrey L.,Rutledge, Peter S.,Woodgate, Paul D.
, p. 2608 - 2614 (2007/10/02)
Treatment of a thallium(I) carboxylate with 1 molar equivalent of bromine gives the corresponding thallium(III) carboxylate dibromide.High yields of primary alkyl bromides are obtained if the thallium(III) carboxylate dibromide is treated with 0.5 mol equiv. of bromine in refluxing carbon tetrachloride.Pyrolysis of the thallium(III) derivative in the absence of added bromine gives a low yield of the corresponding alkyl bromide.The use of thallium(I) carboxylates for the preparation of alkyl bromides in high yields is limited to the salts of primary carboxylic acids.A simple procedure for the preparation of alkyl bromides from carboxylic acids using thallium(I) carbonate has been developed.
