Synthese und Reaktivität von Dienylmetall-Verbindungen

Abstract

Abstract C 5 H 5 Mo(CO) 3 I reacts with AgBF 4 in the presence of EMe 2 (E  S, Se, Te) to give the cations [C 5 H 5 Mo(CO) 3 (EMe 2 )] + (I). The dicarbonyl cations [C 5 H 5 Mo(CO) 2 (EMe 2 ) 2 ] + (II) are obtained as mixtures of the cis and trans isomers, the latter predominating, after the oxidation of (C 5 H 5 Mo(CO) 2 ) 2 with [(C 5 H 5 ) 2 Fe]BF 4 in the presence of EMe 2 . [C 5 H 5 Mo(CO) 2 (SMe 2 ) 2 ] + (IIa) dimerises on heating to give the SMe 2 -bridged dication [(C 5 H 5 Mo(CO)(μ-SMe 2 )) 2 ] 2+ (III) whereas attempts to prepare the analogous S(t-C 4 H 9 ) 2 complex lead to the tetracarbonyl complex [(C 5 H 5 Mo(CO) 2 ) 2 (μ-S(t-C 4 H 9 ) 2 )] 2+ (IV).