CO in dichloromethane Cooling (-78°C) of solns. of (CpFeCO(POPh)3)(η1-C(CH2OMe)CMeSC6H4M3) and (Cp2Fe)(BF4), stirring (20 min, CO, 1 atm), addn. of (Cp2Fe)(BF4) in CH2Cl2 to alkenyliron complex by CO-pressure, stirring (45 min), removing from cold bath, stirring.; Filtn. through Al2O3 , evapn., chromy. of oil on Al2O3 (eluants: hexane/CH2Cl2, CH2Cl2) yields ferrocene as first band , (CpFeCO(POPh)3)(η1-C(CH2OMe)C(CH3)S-p-C6H4CH3) and yellow oil, elem. anal.;