Efficient and Practical Oxidative Bromination and Iodination of Arenes and Heteroarenes with DMSO and Hydrogen Halide: A Mild Protocol for Late-Stage Functionalization
efficient and practical system for inexpensive bromination and iodination of arenes as well as heteroarenes by using readily available dimethyl sulfoxide (DMSO) and HX (X = Br, I) reagents is reported. This mild oxidative system demonstrates a versatile protocol for the synthesis of aryl halides. HX (X = Br, I) are employed as halogenating reagents when combined with DMSO which participates in the present
New water-soluble fluorescent sensors based on calix[4]arene biscrown-6 for selective detection of cesium
作者:Xuan Qui Pham、Laura Jonusauskaite、A. Depauw、Naresh Kumar、J.P. Lefevre、Aurélie Perrier、Minh-Huong Ha-Thi、Isabelle Leray
DOI:10.1016/j.jphotochem.2018.06.017
日期:2018.9
Two new fluorescentchemosensorsbased on calix[4]arene bis(crown-6) bearing coumarin units have been synthesized for the detection of cesium ions in water. The photophysical and complexing properties of these sensors with cesium were investigated using absorption and fluorescence spectroscopies as well as DFT calculations. The coordination of Cs+ by the these ligands induces a better charge transfer
Self-organised nano-arrays of p-phosphonic acid functionalised higher order calixarenes
作者:Thomas E. Clark、Mohamed Makha、Alexandre N. Sobolev、Dian Su、Henry Rohrs、Michael L. Gross、Jerry L. Atwood、Colin L. Raston
DOI:10.1039/b801256c
日期:——
Water-soluble p-phosphonic acid calix[n]arenes (n = 5, 6 or 8) have been synthesized in five steps in overall 68, 66, 67% yield, respectively, by the recently developed procedure for p-phosphonic acid calix[4]arene. The hydrogen bonding prowess of the phosphonic acids dominates their self assembly into nano-arrays in both solution and the gas phase. In DMSO, nano-arrays of p-phosphonic acid calix[6]arene are stable for over 24 h, with the solvent molecules slowly disrupting the hydrogen bonded network affording solvated monomeric units. In the gas phase, nano-arrays of around 20 calixarene units were observed for the p-phosphonic acid calix[n]arenes using MALDI-TOF-MS, and ESI-MS revealed the presence of heteroleptic nano-arrays for a 1 : 1 mixture of p-phosphonic acid calix[4,5]arenes.
Engineering Nanorafts of Calixarene Polyphosphonates
作者:Thomas E. Clark、Mohamed Makha、Alexandre N. Sobolev、Henry Rohrs、Jerry L. Atwood、Colin L. Raston
DOI:10.1002/chem.200701472
日期:2008.4.28
with the hydrogen-bonding prowess of the acidic groups dominating its self-assembly processes. These include the formation of 3.0(3) nm and 20(2) nm nanorafts of the calixarene in water using spinning disc processing, stabilized by acetonitrile, and nanorafts in the gas phase (
PROCESSES FOR THE PREPARATION OF CALIXARENE DERIVATIVES
申请人:Raston Colin L.
公开号:US20100185022A1
公开(公告)日:2010-07-22
A method for the preparation of calix[n]arene derivatives, in particular phosphonated calix[n]arenes. The present invention also relates to nano-structures of phosphonated calix[n]arenes.