Mono- and Dinuclear Bioxazoline-Palladium Complexes for the Stereocontrolled Synthesis of CO/Styrene Polyketones
| Autor: | Luca Mosca, Roberta Seraglia, Alessandro Scarel, Jérôme Durand, Carla Carfagna, Giambattista Consiglio, Giovanni Mestroni, Barbara Milani, Davide Franchi, Ennio Zangrando |
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| Přispěvatelé: | SCAREL A., DURAND J., FRANCHI D., ZANGRANDO E., MESTRONI G., CARFAGNA C., MOSCA L., SERAGLIA R., CONSIGLIO G., MILANI B., Scarel, A., Durand, J., Franchi, D., Zangrando, Ennio, Mestroni, Giovanni, Carfagna, C., Mosca, L., Seraglia, R., Consiglio, G., Milani, Barbara |
| Rok vydání: | 2005 |
| Předmět: |
Stereochemistry
chemistry.chemical_element palladium nitrogen-donor ligands stereoselectivity polymerization polyketones Dinuclear Bioxazoline–Palladium Complexes Catalysis Coordination complex Styrene chemistry.chemical_compound nitrogen-donor ligand Copolymerization Polyketone Tacticity Polymer chemistry Copolymer Chelation mass spectrometry chemistry.chemical_classification Organic Chemistry General Chemistry chemistry Polymerization N ligands palladium Palladium |
| Zdroj: | Chemistry-A European Journal 11 (2005): 6014–6023. doi:10.1002/chem.200500410 info:cnr-pdr/source/autori:Alessandro Scarel,[a]; Jerome Durand,[a]; Davide Franchi,[a]; Ennio Zangrando,[a]; Giovanni Mestroni,[a]; Carla Carfagna,[b]; Luca Mosca,[b]; Roberta Seraglia,[c]; Giambattista Consiglio,[d]; Barbara Milani*[a]/titolo:Mono-and Dinuclear bioxazoline-Palladium complexes for the stereocontrolled synthesis of CO%2FStyrene polyketones/doi:10.1002%2Fchem.200500410/rivista:Chemistry-A European Journal/anno:2005/pagina_da:6014/pagina_a:6023/intervallo_pagine:6014–6023/volume:11 |
| ISSN: | 1521-3765 0947-6539 |
| DOI: | 10.1002/chem.200500410 |
| Popis: | CHIM03 Abstract: The coordination chemistry of the chiral bioxazoline ligand (4S,4'S)-2,2'-bis(4-isopropyl-4,5-dihydrooxazole) to Pd-II provides evidence that the ligand bonding can occur either through chelation of one Pd-II ion leading to a mononuclear species with the expected cis geometry, or by double bridging of two Pd-II ions giving a dinuclear complex with trans geometry. The species in solution are identified by H-1 NMR spectroscopy Both the mononuclear and the dinuclear complexes promote the CO/styrene copolymerization, yielding the corresponding polyketone with a fully or a predominantly isotactic microstructure, depending on the reaction medium. The nature of the anion present in the palladium precatalysts affects the polyketone stereochemistry. MALDI-TOF analysis of the copolymers synthesized reveals the presence of p-hydroxyphenolic end-groups, thus confirming and explaining the role of 1,4-hydroquinone as a molecular weight regulator. |
| Databáze: | OpenAIRE |
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