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- W2078397956 abstract "From experimental data, a conclusion is drawn on chain character of cyclo-olefin ring-opening polymerization. It was suggested that the active centres of this process are carbene complexes of transition metals (W, Mo, Re). The confirmation of this view comes from studies on the initiation of ring-opening polymerization by complexes of tungsten chlorides with phenylcarbene. The latter is formed in the coordination sphere of tungsten by decomposition of phenyl diazomethane. Les données expérimentales concernant la polymérisation par ouverture de cycle des cyclooléfines ont permis de tirer une conclusion concernant le mécanisme réactionnel. On suggère que les centres actifs de ce processus sont des complexes de carbène et de métaux de transition (W. Mo. Re). Les études sur l'amorçage de la polymérisation par ouverture de cycle, par des complexes de chlorures de tungstène avec le phénylcarbène ont permis de confirmer ce point de vue. Le complexe serait formé dans la sphère de coordination du tungstène par décomposition du phényl diazométhane. Partendo da dati sperimentali si è tratto una conclusione circa il carattere di catena della polimerizzazione aprianello cicloolefinico. Si suggerisce che i centri attivi di tale processo sono complessi di carbene di metalli di transizione (W, Mo. Re). La conferma di tale punto di vista viene da studi sull'iniziazione della polimerizzazione di tipo aprianello da parte di complessi di cloruri di tungsteno con fenilcarbene. Quest'ultimo si forma nella sfera di coordinamento del tungsteno mediante decomposizione del fenildiazometano. Aus experimentellen Daten werden Schlüsse bezüglich des Charakters einer Ketten-reaktion bei der ringöffnenden Polymerisation von Cycloolefinen gezogen. Bisher war vorgeschlagen. daβ die aktiven Zentren in diesem Prozess Carbenkomplexe mit Übergangsmetallen (W. Mo. Re) sind. Diese Ansicht konnte bestätigt werden durch Untersuchungen über die Initiierung der ringöffnenden Polymerisation durch Komplexe von Wolframchloriden mit Phenylcarben. Dieses wird in der Koordinationssphäre des Wolframs durch Zersetzung von Phenyldiazomethan gebildet." @default.
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- W2078397956 date "1974-10-01" @default.
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- W2078397956 title "On the mechanism of ring-opening polymerization of cyclo-olefins" @default.
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- W2078397956 doi "https://doi.org/10.1016/0014-3057(74)90025-1" @default.
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