Mews, Rüdiger
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Mews, Rüdiger
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Mews, Rüdiger
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Mews, R.
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Item-typ:Veröffentlichung, Hexahalogenopnicogenate und Tetrachloroaluminate:Außergewöhnlich flexible Liganden in derKoordinationschemie(2007-09-06); ; The aim of this work was to investigate the behavior of weakly coordinating anions (WCAs). For this reason, syntheses, properties and binding ratios of hexafluoroarsenates, hexachloroantimonates and tetrachloroaluminates of the alkaline earth metall SO2 complexes, but also of some of the transitional metal SO2 hexafluoroantimonates were investigated. Some of these complexes have been associated with OPCl3, SOCl2 and (C6F5)2SO.Dissertation191 214 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Cyclische NCF- und NPF-Anionen : Synthesen, Reaktionen, Strukturen(2002-05-29); ; ; The addition of a fluoride to the fluorinated heterocycles : Triazines [(NCF):sub:3:/sub:] and Phosphazenes [(NPF:sub:2:/sub:):sub:n:/sub: n = 4,6] results in the formation of cyclic anions. These anions can be thought of firstly as isolable intermediates of an S:sub:N:/sub:2 substitution reaction and secondly as fluoride transfer reagents since the fluorine bonds at the site of addition are long and weak. Selective nucleophilic substitution reactions involving the neutral heterocycles are difficult under mild conditions, but should be activated by the use of an anion, which react via fluoride exchange at much lower temperatures. Several nucleophilic substitutions were carried out on the anions using Me:sub:3:/sub:SiR derivatives ( R = CF:sub:3:/sub:, NMe:sub:2:/sub:, SiOMe:sub:3:/sub:) as the nucleophile source. Results showed that under mild conditions it was possible to selectively substitute fluorine by other species to form new cyclic triazinates and phosphazinates. Phosphazenes can be isolated in many different ring sizes and the abiltity to stablize negative charges increases with increasing ring size. Using TASF as a source of fluoride it was possible to isolate a cyclic fluorinated phosphazene dianion containing a 12 membered PN ring. The crystal structures of several new cyclic anions could be determined via X-Ray Single Crystal Diffraction.Dissertation307 77 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Koordinationschemie der Azole(2008-01-25); ; ; Tris(azolyl)methylthiolates are obtained in excellent yields via a new synthetic route considering both economic aspects and ease of preparation. Starting from thiophosgene and the silylated azole the bis(azolyl)thioketone is generated and subjected to the addition of a potassium azole anion. An improved synthesis for bis(pyrazolyl)thioketone has enabled the isolation of the intermediate pyrazole-1-carbothioyl-chloride, S=C(Cl)pyrazole, in quantitative yields which in turn has afforded the first asymmetric bis(azole), S=C(pyrazole)(triazole). Tris(azolyl)methylthiolates represent highly reactive nucleophiles that are easily transformed into mono- and bitopic tris(azolyl)methylthio-derivatives. The crystal structures of these compounds and their potential as ligands in coordination chemistry with various transition metals has been studied thoroughly.Dissertation293 124