Metallorganische Lewis-Säuren, XIV [1]. Ethylen-verbrückte Mangan- und Rheniumcarbonyle; Tieftemperatur-Röntgenstrukturanalyse von (OC)5ReCH2CH2Re(CO)5 / Organometallic Lewis Acids, XIV [1]. Ethylene Bridged Manganese and Rhenium Carbonyls; Low Temperature X-Ray Structure of (OC)5ReCH2CH2Re(CO)5

Abstract

The tetrafluoroborato complexes (OC)₅MFBF₃ (M = Mn, Re) which are obtained by methyl abstraction from (OC)₅MCH₃ using Ph₃CBF₄ react with ethylene or propene at room temperature and 1 bar to give [(OC)₅M(alkene)]⁺ BF₄-. By nucleophilic addition of the carbonylmetalates [M(CO)s] -(M = Mn, Re) to the coordinated alkene in these cationic complexes [(OC)₅M(alkene)]⁺ the alkene bridged complexes (OC)₅MCH₂CH(R)M(CO)₅ (M = Mn, Re; R = H, Me) are formed. Also the mixed-metal complex (OC)₅MnCH₂CH₂Re(CO)₅ has been isolated. According to an X-ray structure at low temperature (OC)₅ReCH₂CH₂Re(CO)₅ can be considered as a dimetal substituted ethane with a carbon-carbon distance of 152 pm.