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lene (4.41%) and germacrene D (4.23%).The reaction of the rhodium aqua-complex (SRh,RC)-[Cp*Rh(R)-Prophos (OH2)][SbF6]2 [Cp* = C5Me5, Prophos = propane-1,2-diyl-bis(diphenylphosphane)] (1) with trans-4-methylthio-β-nitrostyrene (MTNS) gives two linkage isomers (SRh,RC)-[Cp*Rh(R)-Prophos(κ1O-MTNS)]2+ (3-O) and (SRh,RC)-[Cp*Rh(R)-Prophos(κ1S-MTNS)]2+ (3-S) in which the nitrostyrene binds the metal through one of the oxygen atoms of the nitro group or through the sulfur atom, respectively. Both isomers are in equilibrium in dichloromethane solution, the equili