164356-70-1Relevant articles and documents
Phosphine-tethered carbene ligands: Template synthesis and reactivity of cyclic and acyclic functionalized carbenes
Yu, Insun,Wallis, Christopher J.,Patrick, Brian O.,Diaconescu, Paula L.,Mehrkhodavandi, Parisa
, p. 6065 - 6076 (2011/02/27)
Reaction of the phosphine-tethered isocyanide iron(II) complex 1, [CpFe(CO)(PCN)]I, with primary and secondary amines forms the corresponding acyclic (diamino)carbene complexes [CpFe(CO)(PCXNH)]I; X = n-butylamine (4), 4-methylaniline (5), dihexylamine (6
Synthesis and coordination chemistry of a novel phosphinimine phosphine
Liu, Chung-Yuan,Chen, Der-Yi,Cheng, Ming-Chu,Peng, Shie-Ming,Liu, Shiuh-Tzung
, p. 1983 - 1991 (2008/10/09)
The incorporation of a phosphinimino moiety into phosphine ligands to form a new bidentate PH3P=N(CH2)3PPh2 (1) is reported. Compound 1 can act as a σ-N and σ-P donor ligand or react with metal carbonyls to form isocyanide complexes. Complexes of (CO)4M-(1-P,N) [M = Mo (2), W (3)] were prepared from the reaction of Et4N[M(CO)5Br] with 1 in refluxing THF solution, whereas the isocyanide complexes of (CO)5MCN(CH2)3PPh2 [M = Cr (4), Mo (5), W (6)] are obtained from the reaction of M(CO)6 with 1 at 25°C. The deoxygenation nature is also shown in the reaction of CpFe(CO)2I, CpRu(CO)2I, Re(CO)5Br, and Re2(CO)10 with 1 to form the corresponding isocyanide complexes [CpFe(CO){CN(CH2)3-PPh2-C,P}]I (7), CpRu(CO)I{CN(CH2)3PPh2-C} (10), BrRe(CO)5-n{CN(CH2)3PPh2-C} n [n = 1 (12), 2 (14)], and Re2(CO)9{CN(CH2)3PPh2-C} (15), respectively. The free phosphine of 10 underwent exchange with one triphenylphosphine ligand in CpRu(PPh3)2Cl to yield the binuclear species [CpRu(PPh3)Cl{P(Ph2)(CH2) 3NC}Ru(CO)CpI] (11), whereas intramolecular ligand substitution occurred in both 12 and 15 to give Br(CO)3Re{CN(CH2)3PPh2-C,P} (13) and {μ-CN(CH2)3PPh2}Re2(CO) 8 (16). Reaction of (COD)PdCl2 with 1 produced the complex (1-P,N)PdCl2 (18), in which 1 acts as a σ-N, σ-P bidentate ligand. X-ray crystal structural analysis of [CpFe(CO){CN(CH2)3PPh2-C,P}]PF6 (7a) and 18 confirmed the formulation of both complexes. The C≡N bond distance [1.20(3) A?] of 7a is greater than those in the related iron-isocyanide complexes; the angle C-N-C [141(2)°] deviates from 180°, indicating that the resonance contribution of Fe=C=N- is more important than that of Fe-C≡N-. These observations are consistent with spectral data, the smaller infrared stretching wavenumber (2089 cm-1), and the greater shift (13C NMR δ 183.7 ppm) of the isocyanide moiety of 7.