Produkte aus nachwachsenden Rohstoffen, energie‐ und ressourcenschonende Synthesen mit neuartigen Katalysatoren und der Ersatz von organischen Lösungsmitteln durch „smarte”︁ Solvenzien liefern Beispiele für die Potenziale der Green Chemistry. Deren Karriere hat nach Einschätzung internationaler Experten gerade erst begonnen.
Abstract The cationic sulfur dioxide complexes [CpFe(CO)2SO2]+AsF6- (7) and [CpCr(NO)2SO2]+AsF6- (9) are obtained in almost quantitative yield from CpFe(CO)2I(CpCr(NO)2Cl) and AgAsF6 in liquid SO2. With excess transition metal halide dinuclear halogen-bridged cations ([CpFe(CO)2IFe(CO)2Cp]+ and [CpCr(NO)2ClCr(NO)2Cp]+) are formed. The crystal structure of 7 is reported, and the bonding in the complexes is discussed in the light of spectroscopic data.
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