Cyclopentenyliden‐Komplexe aus Alkinylcarben‐Komplexen, Lithiumaryl und H+
作者： Helmut Fischer , Thomas Meisner , Josef Hofmann
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摘要: Cyclopentenylidene Complexes from Alkinylcarbene Complexes, Aryllithium and H+ [Alkoxy(phenylethynyl)carbene]pentacarbonyl complexes of chromium tungsten, (CO)5M[C(CCPh)OR] (1) (M Cr, W, R Me, Et) react with Li[C6H4R′-p] (R′ H, Me) HBF4 - Et2O to give the vinylcarbene (CO)5-M{C[CHC(Ph)C6H4R′-p]OR} 2 two isomeric cyclopentenylidene 3 4. The ligand is formed carbene ligands 1, [C6H4R′-p]− H+. structure 4a Et, R′ established by an X-ray analysis. product ratio strongly depends on reaction conditions. complex 3c reacts ethyl vinyl ether 3,5-bis(methylene)cyclopentene derivative 8 metathesis.
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