Highly effective copper-catalyzed decarboxylative coupling of aryl halides with alkynyl carboxylic acids
作者:Xiaoming Qu、Tingyi Li、Peng Sun、Yan Zhu、Hailong Yang、Jincheng Mao
DOI:10.1039/c1ob05969f
日期:——
We have developed a highly effective copper-catalyzeddecarboxylativecoupling of alkynylcarboxylic acids with various aryl and alkyl halides at 2 mol% loading of copper. This method is simple, economical and practical for the synthesis of disubstituted alkyne compounds.
as ligands for PdII-promoted organic reactions are reported for the first time. These ligands were utilized as catalytic sites and integrated into the skeleton of conjugated microporous polymers. By employing these CMP materials as selective regulators, oxidative Heck reactions between arylboronic esters and electronically unbiased alkenes provide highlyselective linear products.
SYNTHESIS, SOME SPECTROSCOPIC AND ELECTROCHEMICAL INVESTIGATIONS ON NOVEL MONOMERIC AND POLYMERIC ACETYLENE SUBSTITUTED THIOPHENE MONOMERS AND POLYMERS
作者:Hans Zimmer、Kobkul Sudsuansri、Harry B. Mark、Bernd Ziegler
DOI:10.1080/10426509708043516
日期:1997.3.1
Abstract Acetylenesubstituted thiophenes of the following types were synthesized: Ar-[tbnd]-Ar-[tbnd]-Ar, Ar′-[tbnd]-Ar′-[tbnd]Ar′, Ar-[tbnd]-Ar′-[tbnd]-Ar, Ar′-[tbnd]-Ar-Ar-[tbnd]-Ar′, Ar-[tbnd]-Ar-Ar′-[tbnd]-Ar′These monomen were polymerized to the corresponding polymers. The UV-spectra and their oxidation potentials were determined. Attempts to correlate these two properties will be reported. The
Synthesis, photophysics and molecular structures of luminescent 2,5-bis(phenylethynyl)thiophenes (BPETs)
作者:Jamie S. Siddle、Richard M. Ward、Jonathan C. Collings、Simon R. Rutter、Laurent Porrès、Lucas Applegarth、Andrew Beeby、Andrei S. Batsanov、Amber L. Thompson、Judith A. K. Howard、Abdou Boucekkine、Karine Costuas、Jean-François Halet、Todd B. Marder
DOI:10.1039/b701172e
日期:——
The spectroscopic studies of 1a–h and 2 show that both electron donating and electron withdrawing para-subsituents on the phenyl rings shift the absorption and emission maxima to lower energies, but that acceptors are more efficient in this regard. The short singlet lifetimes and modest fluorescence quantum yields (ca. 0.2–0.3) observed are characteristic of rapid intersystem crossing. The single-crystal
hydrosilylation of allenes with primary and secondary phenylsilanes. It shows high selectivity towards the production of branched allylsilanes with a wide range of allenes. It is worth mentioning that the catalytic loading of the palladium can be reduced to 500 ppm. This work opens a new front of using bidentate thiophene ligand as a reaction promoter in transition‐metal‐catalyzed organic reaction.