BIFUNCTIONAL NEUTRAL PHOSPHENIUM ION COMPLEXES - SYNTHESIS OF PHENYLETHYNYL-SUBSTITUTED AND STYRYL-SUBSTITUTED (R)(R')P=MO-(ETA-5-C5ME5)(CO)2 COMPOUNDS - CRYSTAL-STRUCTURE OF [2,6-TBU2-4-MEC6H2O)(PHC=C)]P=MO(ETA-5-C5ME5)(CO)2

The reactions of the phenylethynylchlorophosphine (2,6-tBu2-4-MeC6H2O)P(Cl)(CCPh) (I) or the styrylchlorophosphine (2,4,6-tBu3C6H2O)P(Cl)[(Ph)(H)CC(H)] (IV) with Li[Mo(η5-C5Me5)(CO)3] (II) in THF give bifunctionalized terminal phosphenium ion complexes of the type (R)(R′)PMo(η5-C5Me5)(CO)2 (III: R = 2,6- tBu2-4-MeC6H2O, R′ = CCPh; V: R = 2,4,6-tBu3C6H2O, R′ = (Ph)(H)CC(H)), which contain a trigonally planar coordinated phosphorus atom. Compounds III and V have been identified from analytical and spectroscopic (IR, 1H, 13C, 31P NMR) data. The molecular structure of [(2,6-tBu2-4-MeC6H2O)(PhCC)]- PMo(η5-C5Me5)(CO)2 (III) has been determined by an X-Ray diffraction study. © 1990.