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- W1607981569 abstract "The asymmetric selective polymerization1 of epoxyethyltrimethylsilane (ETMS) and of (2.3-epoxypropoxy)trimethylsilane (EPOS) were studied using a catalyst system formed by an organometallic compound reacted with an optically active reagent. Optically active polymers were obtained in both cases but the asymmetric selectivity of EPOS polymerization was low, considering the weak optical activity of glycidol derived from the hydrolysis of recovered monomer. Concurrently, this experiment permitted us to deduce that dextrotatory EPOS has the same configuration as dextrorotatory glycidol.A polymer of EPOS was submitted to a series of reactions leading to a polymer identical to polypropylene oxide (PPO). The optical behaviour of this polymer, studied in comparison with PPO, also confirmed the relation between the absolute configuration of EPOS and its optical rotation sign. This is the first example, in which the absolute configuration can be determined by utilizing the asymmetric selective polymerization.Die asymmetrische, selektive Polymerisation von Epoxyathyltrimethylsilan (ETMS) und von 2.3-Epoxypropoxytrimethylsilan (EPOS) wurde unter Verwendung eines Katalysatorsystems, das sich durch Umsetzung einer metallorganischen Verbindung mit einem optisch aktiven Reagens bildet, untersucht. In beiden Fallen wurden optisch aktive Polymere erhalten; jedoch war die asymmetrische Selektivitat bei der EPOS-Polymerisation gering, wie auf Grund der schwachen optischen Aktivitat des Glycids, das durch Hydrolyse des wiedergewonnenen Monomeren erhalten wurde, geschlossen werden kann. Gleichzeitig erlaubte uns dieses Experiment nachzuweisen, das das rechtsdrehende EPOS die gleiche Konfiguration besitzt wie das rechtsdrehende Glycid." @default.
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- W1607981569 date "1970-05-22" @default.
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- W1607981569 doi "https://doi.org/10.1002/macp.1970.021340122" @default.
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