51241-37-3Relevant academic research and scientific papers
A hydrogen-bonded supramolecular hexagonal columnar liquid crystal composed of a tricarboxylic triphenylene and monopyridyl dendrons
Ishihara, Shinsuke,Furuki, Yuusuke,Takeoka, Shinji
, p. 282 - 283 (2007)
Tricarboxylic triphenylene (TPC5) and monopyridyl dendron (DenC12) were mixed in 1:2,1:3, and 1:4 molar ratios, and investigation by IR, DSC, and XRD studies proved that TPC5 and DenC12 self-assembled to form a hexagonal columnar liquid crystal with 1:3 m
Coordinative nanoporous polymers synthesized with hydrogen-bonded columnar liquid crystals
Ishihara, Shinsuke,Furuki, Yusuke,Hill, Jonathan P.,Ariga, Katsuhiko,Takeoka, Shinji
, p. 7885 - 7895 (2013/02/23)
In this paper, we report the development of nanoporous polymer which demonstrates the coordination property toward zinc porphyrin. A hydrogen-bonded columnar liquid crystalline precursor composed of a triphenylene template and three equivalent of the surr
Selectivity engineering of phase transfer catalyzed alkylation of 2′-hydroxyacetophenone: Enhancement in rates and selectivity by creation of a third liquid phase
Yadav, Ganapati D.,Desai, Neesha M.
, p. 749 - 756 (2012/12/26)
Enhancements in rate of reaction and selectivity of the desired product in biphasic reactions are achieved by creating a third liquid phase, under appropriate conditions, where the third liquid phase is the locale of the main reaction, having a dramatic effect on product distribution in complex chemical reactions. Thus, in the case of phase transfer catalysis (PTC), conversion of liquid-liquid (L-L) PTC into liquid-liquid-liquid (L-L-L) PTC is of considerable techno-commercial interest resulting in waste minimization which is a major theme of green chemistry. Etherification of 2′-hydroxyacetophenone with 1-bromopentane, under traditional liquid-liquid phase transfer catalysis, results in loss of catalyst. However, the transformation of two liquid phases into three liquid phases (L-L-L) PTC leads enhancement in rates by orders of magnitude, with 100% conversion of the limiting reactant 1-bromopentane and 100% selectivity to 2′-pentyloxyacetophenone. This strategy eliminates separation problems and results in high reaction rates reducing the total reaction time. Moreover, the catalyst-rich third phase is recycled more than 7 times without loss in activity. The kinetics of the reaction are studied in great detail. There is a substantial reduction in activation energy under L-L-L PTC vis-a-vis L-L PTC, where the locale of the reaction is shifted from the organic phase to the third phase.
