253446-34-3Relevant academic research and scientific papers
Synthesis of thermotropic liquid crystals derived from phenylpiperazine containing an enyne unit
Gallardo, Hugo,Maurmann, Leila
, p. 23 - 34 (2007/10/03)
Thermotropic liquid crystals are of great technological importance. Much research is devoted to the development of stable compounds with transition temperatures close to room temperature. The interest of this work is the synthesis of thermotropic liquid crystal precursor units containing phenylpiperazine and/or phenylacetylenic units. Homologues of a Schiff base series and an enyne series have been synthesized, allowing comparisons of their mesomorphic and thermodynamic properties. The Schiff bases showed smectogenic behavior and the enynes a smectic dimorphism and/or a nematic phase. The synthetic methodology was efficient for the synthesis of the desired precursor, 4-[4′-(prop-l-yn-3-al)phenyl]-piperazine-l-carboxylic acid ethyl ester.
Nickel-catalysed couplings of aryl chlorides with secondary amines and piperazines
Brenner, Eric,Schneider, Raphael,Fort, Yves
, p. 12829 - 12842 (2007/10/03)
The reaction of aryl chlorides with secondary amines or piperazines in the presence of an in situ generated liganded nickel catalyst gives arylamines in good yields. Our process provides a mild, convenient and cheap method of arylamination starting from readily available substrates.
