Bifunctional neutral phosphenium ion complexes: synthesis of phenylethynyl- and styryl-substituted (R)(R')P=Mo(η5-C5Me5)(CO)2 compounds. Crystal structure of tBu2-4-MeC6H2O)(PhCC)>P=Mo(η5-C5Me5)(CO)2

Article abstract of DOI:10.1016/0022-328X(90)85427-Z

The reactions of the phenylethynylchlorophosphine (2,6-^tBu2-4-MeC6H2O)P(Cl)(C<*>CPh) (I) or the styrylchlorophosphine (2,4,6-^tBu3C6H2O)P(Cl)<(Ph)(H)C=C(H)> (IV) with Li5-C5Me5)(CO)3> (II) in THF give bifunctionalized terminal phosphenium ion complexes of the type (R)(R')P=Mo(η⁵-C5Me5)(CO)2 (III: R = 2,6-^tBu2-4-MeC6H2O, R' = C<*>CPh; V: R = 2,4,6-^tBu3C6H2O, R' = (Ph)(H)C=C(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)(PhC<*>C)>P=Mo(η⁵-C5Me5)(CO)2 (III) has been determined by an X-Ray diffraction study.