Synthesis of functionalized copillar[4+1]arenes and rotaxane as heteromultivalent scaffolds
作者:Wenzhang Chen、Tharwat Mohy EI Dine、Stéphane P. Vincent
DOI:10.1039/d0cc07684h
日期:——
In this study, novel copillar[4+1]arenes were used as central heteromultivalent scaffolds via orthogonal couplings with a series of biologically relevant molecules such as carbohydrates, α-amino acids, biotin and phenylboronic acid. Further modifications by introducing maleimides or cyclooctyne groups provided molecular probes adapted to copper-free click chemistry. An octa-azidated fluorescent rotaxane
Orientation effects in monodomain nematic liquid crystalline polysiloxane elastomers
作者:D. Lacey、H. N. Beattie、G. R. Mitchell、J. A. Pople
DOI:10.1039/a705570f
日期:——
A series of monodomain liquid crystalline (LC) elastomers based on a polysiloxane were synthesised. These elastomers were prepared either with one or two cross-linking agents in the presence of a mechanical field. By using the real-time X-ray facility at the University of Reading (AXIS), we have shown that the nematic order parameter 〈P2 〉 is dependent on both the extension λ value and the degree of cross-linking. We have also shown that the monodomain elastomers, exhibiting permanent alignment and 〈P2 〉 values of about 0.5, can be prepared by using only one cross-linking agent making the synthesis of these monodomain LC elastomers much more simple and cost effective than that proposed by Küpfer.
Efficient Macrocyclization Achieved via Conformational Control Using Intermolecular Noncovalent π-Cation/Arene Interactions
作者:Philippe Bolduc、Alexandre Jacques、Shawn K. Collins
DOI:10.1021/ja106053x
日期:2010.9.22
Quinolinium salt 3 is an effective additive that acts as a conformation control element (CCE) to promote macrocyclization to form rigid cyclophanes via olefin metathesis or Glaser-Hay coupling, which do not cyclize in the absence of the additive. The additives are easily synthesized and highly modifiable and have solubility profiles which allow for simple recovery via filtration.
A General, Practical, and Versatile Strategy for Accessing ω-Functional 1,2-Diols of High Enantiomeric Excess
作者:Thomas R. Hoye、Michael J. Mayer、Tricia J. Vos、Zhixiong Ye