No abstract

Several new liquid-crystalline materials have been synthesized and their properties investigated. These belong to a series of fl-diketones containing different terminal substituents. Mesophases of the smectic C, smectic A and nematie types have been observed in these /~-diketones. Using these ligands many copper(II) and palladium(II) complexes have also been synthesized and their mesogenic behaviour characterized. Microscopic observations and differential scanning calorimetric measurements show that these chelates exhibit the nematic phase. The DSC data also indicate that the nematic phase of the ligands and complexes is associated with very low clearing transition enthalpies. All the metaUonematogens reported are enantiotropic in nature.

reactions of organo-metal compounds reactions of organo-metal compounds O 0350 35 -063 Palladium-and Copper-Catalyzed Homocoupling of Organolead Compounds: Synthesis of Biaryls and Diynes. -The dimerization of organolead triacetates (I) in the presence of Pdor Cu-catalysts proceeds under mild conditions. -(KANG, S.-K.; SHIVKUMAR, U.; AHN, C.; CHOI, S.-C.; KIM, J.-S.; Synth.