An environmentally benign solvent system, Solkane365/227/ethanolblend, was developed for Suzuki–Miyauracross-couplingreactions of aryl boronic acids and aryl halides. The reaction is quite general and gives excellent yields for various aryl, heteroaryl, and fluoroaryl boronic acids or halides. Interestingly, this system also allows the synthesis of polyaryls.
Shape Selectivity by Guest-Driven Restructuring of a Porous Material
作者:J. E. Warren、C. G. Perkins、K. E. Jelfs、P. Boldrin、P. A. Chater、G. J. Miller、T. D. Manning、M. E. Briggs、K. C. Stylianou、J. B. Claridge、M. J. Rosseinsky
DOI:10.1002/anie.201307656
日期:2014.4.25
A flexible metal‐organic framework selectively sorbs para‐ (pX) over meta‐xylene (mX) by synergic restructuring around pX coupled with generation of unused void space upon mX loading. The nature of the structural change suggests more generally that flexible structures which are initially mismatched in terms of fit and capacity to the preferred guest are strong candidates for effective molecular separations
We report the synthesis, characterization and reactivity of an air-stable, well-defined acenaphthoimidazolylidene palladium–BIAN–NHC chloro dimer complex, [Pd(BIAN–IPr)(μ-Cl)Cl]2. This rapidly activating catalyst merges the reactive properties of palladium chloro dimers, [Pd(NHC)(μ-Cl)Cl]2, with the attractive structural features of the BIAN framework. [Pd(BIAN–IPr)(μ-Cl)Cl]2 is the most reactive Pd(II)–NHC
hindered arylchlorides are the most challenging substrates in Suzuki–Miyaura cross-coupling (SMC) reactions. Herein, we report a highly efficient catalytic system for the SMC reaction using trace amounts of commercially available catalysts [Pd(PPh3)4/(t-Bu)PCy2; Pd loading as low as 9.5 × 10−5 mol%]. This catalytic system can efficiently couple deactivated and sterically hindered arylchlorides with various