Stereoselective syntheses of co-ordinated phosphines: stereospecific generation and alkylation of the tertiary phosphido–metal group in (R*,R*)-[(η5-C5H5){1,2- C6H4(PMePh)2}FePMePh] at –90 °C
Abstract
Deprotonation of [(R*,R*),(R*)]-[(η5-C5H5){1,2-C6H4(PMePh)2}FePHMePh]PF6(1) with KOBut below –90 °C, followed by treatment of the intermediate tertiary phosphido–metal complex with iodoethane at the same temperature, produces [(R*,R*),(S*)]-[(η5-C5H5){1,2-C6H4(PMePh)2}FePEtMePh]PF6 in >99% diastereoisomeric excess.