Übergangsmetall-substituierte Diphosphene, XXVI [1] Zum Einfluß des Ringliganden auf Bildungstendenz und Stabilität von Diphosphenyleisenkomplexen des Typs

The disilylphosphido iron complexes (//5-C5R5)(CO)2Fe-P(SiMe3)2 ( lb -d ) result from the reaction o f the corresponding bromo compounds (//5-C5R5)(CO)2FeBr with LiP(SiM e,)2-2T H F. The complexes 2 b -d are cleanly converted into the diphosphenyl com ­ plexes (?75-C5R5)(CO)2Fe-P=P-M es* (2b-d) by treatment with equimolar amounts o f Mes*PCl2. The products l b d and 2 b -d have been characterized by elemental analysis as well as spectroscopic data (IR, 'H, l3C, 31P N M R , MS). The molecular structure o f (?75-C5Me4Et)(CO)2Fe-P(SiM e3)2 ( lb ) has been established by single-crystal X-ray analysis.