The reactions of [CpMn(CO)2(NO)]BF4 or CpFe(CO)2Cl with PPh2NHR (R = Ph, PPh2) lead to the salts [CpML(CO)PPh2NHR]X with monodentate aminophosphine ligands. In the case of R = PPh2 (= dppa) the complexes [CpML(dppa)]X with bidentate dppa are also formed. The salt [CpFe(CO)(dppa)]Cl can be deprotonated to give the neutral complex CpFe(CO)(PPh2)2N)} with the diphosphinoamide ligand, which can be N-alkylated by Mel to afford [CpFe(CO)(PPh2)2NMe}]I. The complex [CpMn(NO)(dppa)]BF4 undergoes a P-N cleavage reaction by the solvent methanol to form [CpMn(NO)(PPh2NH2)(PPh2OMe)]BF4. The non-chelated complexes [CpFe(CO)2PPh2NHR]Cl are deprotonated by DBU to give the neutral ferrioiminophosphoranes CpFe(CO)2PPh2 = NR. For R = PPh2 photolysis leads to CO-elimination and to CpFe(CO)(PPh2NPPh2). CpFe(CO)2PPh2NPPh2 can be alkylated by Mel or metallated by CpFe(CO)2Cl to form [CpFe(CO)2PPh2NPPh2Me]I or [CpFe(CO)2PPh2NPPh2(CO)2FeCp]Cl, respectively. Oxidation of CpFe(CO)2PPh2NPPh2 is possible by (SiMe3)2O2, sulfur, or selenium to lead to the neutral complexes CpFe(CO)2PPh2=NPPh2 = E (E = O, S, Se) with a heterodiene system. The IR and NMR spectra of all species as well as the X-ray structures of the complexes [CpFe(CO)dppa]Cl, [CpMn(NO)dppa]BF4 and [CpMn(NO)(PPh2NH2)(PPh2OMe)]BF4 are reported and discussed.
The reaction of [Cp′Mn(CO)2NO]X (Cp = C5H5, C5H4Me = Cp′; X =BF4, PF6) with PPh2H leads to the formation of the diphenylmanganiophosphonium salts [CpMn(CO)NO}PPh2H]X, which can be deprotonated by DABCO to give the not isolable manganiophosphane CpMn(CO)NO}PPh2. This reactive intermediate, however, can be methylated by MeI and CF3SO3Me or organometallated by C5H5Fe(CO)2Cl to yield the phosphonium salts [Cp′Mn(CO)NO}PPh2Me]PF6 and [Cp′Mn(CO)NO}PPh2C5H5Fe(CO)2}]PF6, respectively. The methyl derivative is deprotonated by πBuLi to give the unstable methylene phosphorane Cp′Mn(CO)NO}PPh2=CH2, an organometallated phosphorus ylide. The in situ from [Cp′Mn(CO)NO}PPh2H]BF4 generated phosphane Cp′Mn(CO)NO}PPh2 is oxidized by epoxycyclohexane to give the intermediate oxophosphorane Cp′Mn(CO)NO}P(O)Ph2, which reacts with the still available starting material to yield the first dimanganiodiphenylphosphonium salt [Cp′Mn(CO)NO}2PPh2]BF4. The compounds have been characterized by spectroscopic (IR, NMR, MS), analytical (C, H, N) and X-ray diffraction investigations ([C5H5Mn(CO)NO}PPh2H]BF4, [Cp′Mn(CO)NO}PPh2Me]BF6, [Cp′Mn(CO)NO}2PPh2]-BF4).