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The tetrafluoroborato complexes (OC) 5 MFBF 3  (M = Mn, Re) which are obtained by methyl abstraction from (OC) 5 MCH 3  using Ph 3 CBF 4  react with ethylene or propene at room temperature and 1 bar to give [(OC) 5 M(alkene)] +  BF 4 -. By nucleophilic addition of the carbonylmetalates [M(CO)s] -(M = Mn, Re) to the coordinated alkene in these cationic complexes [(OC) 5 M(alkene)] +  the alkene bridged complexes (OC) 5 MCH 2 CH(R)M(CO) 5  (M = Mn, Re; R = H, Me) are formed. Also the mixed-metal complex (OC) 5 MnCH 2 CH 2 Re(CO) 5  has been isolated. According to an X-ray structure at low temperature (OC) 5 ReCH 2 CH 2 Re(CO) 5  can be considered as a dimetal substituted ethane with a carbon-carbon distance of 152 pm.

zeitschrift für naturforschung b

Metallorganische Lewis-Säuren, XIV [1]. Ethylen-verbrückte Mangan- und Rheniumcarbonyle; Tieftemperatur-Röntgenstrukturanalyse von (OC) 5 ReCH 2 CH 2 Re(CO) 5  / Organometallic Lewis Acids, XIV [1]. Ethylene Bridged Manganese and Rhenium Carbonyls; Low Temperature X-Ray Structure of (OC) 5 ReCH 2 CH 2 Re(CO) 5