Synthesis, mesomorphic behaviour and optical anisotropy of some novel materials for nematic mixtures of high birefringenceElectronic supplementary information (ESI) available: experimental procedures for all compounds not already given in this paper. See http://www.rsc.org/suppdata/jm/b4/b400630e/
作者:Michael Hird、Kenneth J. Toyne、John W. Goodby、George W. Gray、Victoria Minter、Rachel P. Tuffin、Damien G. McDonnell
DOI:10.1039/b400630e
日期:——
Structural moieties including core units (such as phenyl, naphthyl and thiophenyl), linking groups (such as ethynyl), terminal substituents (such as cyano, isothiocyanato and fluoro), and lateral fluoro substituents have been incorporated into novel materials designed to confer a high birefringence on nematic mixtures. The materials have all been prepared through convergent syntheses involving palladium-catalysed cross-coupling reactions of arylboronic acids. The materials were examined for their mesomorphic behaviour as neat materials and as mixtures; some materials were found to have extremely high nematic phase stability, and others were non-mesogenic. The materials were evaluated in nematic host mixtures for their optical anisotropy, and they were all found to show promisingly high values.
Dendritic Ligands for Magnetic Suspensions in Liquid Crystals
作者:Martin Hähsler、Silke Behrens
DOI:10.1002/ejoc.201901450
日期:2019.12.31
The synthesis of long-chain, aliphatic and space filling dendritic ligands containing (pro)mesogenic, aliphatic or nitrile biphenyl moieties for the stabilization of magnetic nanoparticles in liquid crystal hosts is described. A Negishi or Sonogashira cross-coupling is exploited as a key step in the synthetic sequence. These synthetic procedures enable the synthesis of various ligands which can be
One‐Pot Sequential Kumada–Tamao–Corriu Couplings of (Hetero)Aryl Polyhalides in the Presence of Grignard‐Sensitive Functional Groups Using Pd‐PEPPSI‐IPent
<sup>Cl</sup>
作者:Narayan Sinha、Pier Alexandre Champagne、Michael J. Rodriguez、Yu Lu、Michael E. Kopach、David Mitchell、Michael G. Organ
DOI:10.1002/chem.201901150
日期:2019.5.7
We report a general and rapid chemoselective Kumada–Tamao–Corriu (KTC) cross‐coupling of aryl bromides in the presence of chlorides or triflates with functionalized Grignardreagents at 0 °C in 15 min by using Pd‐PEPPSI‐IPentCl (C4). Nucleophiles and electrophiles (or both) can contain Grignard‐sensitive functional groups (‐CN, ‐COOR, etc.). Control experiments together with DFT calculations suggest
Octahydro-pyrrolo[3,4-b]pyrrole derivatives are useful in treating conditions or disorders prevented by or ameliorated by histamine-3 receptor ligands, Octahydro-pyrrolo[3,4-b]pyrrole compounds, methods for using such compounds, compositions for making them, and processes for preparing such compounds are disclosed herein.
Octahydro-pyrrolo[3,4-b]pyrrole derivatives are useful in treating conditions or disorders prevented by or ameliorated by histamine-3 receptor ligands, Octahydro-pyrrolo[3,4-b]pyrrole compounds, methods for using such compounds, compositions for making them, and processes for preparing such compounds are disclosed herein.