کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
67920 | 48498 | 2008 | 7 صفحه PDF | دانلود رایگان |

Heterogeneous Sonogashira coupling of terminal alkynes with aryl halides was studied over a quinoline-2-carboimine palladium complex immobilized on MCM-41 (Pd-2QC-MCM) catalyst. The cross-coupling reaction occurred within 3 h at 80 °C by adding a piperidine in N-methyl-2-pyrolidone (NMP) solvent. By varying the combination of alkynes and aryl halides, Pd-2QC-MCM showed effective catalytic activities to produce corresponding tolane derivatives with moderate to excellent yields. Pd-2QC-MCM can be reused without significant loss of its catalytic activity until the fourth recycle under aerobic conditions because of negligible leaching of palladium metal and a high turnover number (∼2850) in the reaction of phenyl acetylene with iodobenzene. The excellent catalytic performance of Pd-2QC-MCM indicates that the reactions effectively occurred by a palladium complex immobilized on mesoporous silica.
Heterogeneous Sonogashira cross-coupling of terminal alkynes with aryl halides was studied over a quinoline-carboimine palladium complex immobilized on MCM-41 (Pd-2QC-MCM) as catalyst. Cross-coupling of phenyl acetylene with iodobenzene proceeded within 3 h at 80 °C by adding two-fold amount of piperidine in NMP solvent to afford tolane in excellent yield. Pd-2QC-MCM can be reused without significant loss of activity until 4th recycles.Figure optionsDownload as PowerPoint slide
Journal: Journal of Molecular Catalysis A: Chemical - Volume 293, Issues 1–2, 1 October 2008, Pages 72–78