Backbone modified small bite-angle diphosphines: Synthesis and molecular structures of [M(CO)4{X2PC(R1R2)PX2}] (M=Mo, W; X=Ph, Cy; R1=H, Me, Et, Pr, allyl, R2=Me, allyl)

Syntheses and Structures of [CH2(NCnH2n)2]Mo(CO)4 (n = 4,5) Complexes with Bis(cycloamine) Ligands Easily Prepared from CH2Cl2

“…For example, dicyclohexylphosphinomethane shows 67.397 (17)°and 75.70(2)°for (dcpm)Mo-(CO) 4 and (dcpm)NiCl 2 complexes, respectively. 28,29 ■ CONCLUSIONS…”

Three Isomers in Equilibrium: Phosphine Exchange of Coordinated and Pendant Phosphines in a Unique Complex, (OC)5WL (L = 1,2-Bis(diphenylphosphino)-1-di-p-tolylphosphinoethane), and Implications for Understanding the k2 Term in the Rate Law for Phosphine Substitution in Group 6 Metal Carbonyl Complexes

“…The short pendant phosphine in 3a is directed toward the equatorial carbonyl plane with P(2) only 3.35 Å from C(41). We have seen this close approach of the pendant phosphorus to CO previously in a number of (OC) 5 W­(P–C–P) complexes, but this is the shortest one yet. , Several other features are of interest: (1) The P–C–P bond angle is less than 102°, the smallest angle recorded in 122 MP–C–P complexes containing geminal phosphines . This value is smaller than that found in the free ligand (106.2°) and not much larger than that found in the chelated [(OC) 4 W­(κ 2 -PPh 2 CH 2 PPh 2 )]­(97.4°) .…”

[2,2-Bis(diphenylphosphanyl)propane-κ2P,P′]tetracarbonylchromium(0) dichloromethane monosolvate

“…For an alternative synthesis of the title compound, see: Al-Jibori & Shaw (1983). For the synthesis of Ph 2 PCMe 2 PPh 2 and Mo or W carbonyl complexes of related ligands with different substituents at the central carbon, see: Hogarth & Kilmartin (2007). For complexation of Ph 2 PCMe 2 PPh 2 and structural characterization of monomeric complexes of Pd or Ru, see: Barkley et al (1995Barkley et al ( , 1998; Anandhi et al (2003).…”

“…[Cr(C 27 H 26 P 2 )(CO) 4 ]ÁCH 2 Cl 2 M r = 661.38 Triclinic, P1 a = 8.9998 (5) Å b = 9.4895 (5) Å c = 18.3178 (9) Å = 99.811 (4) = 94.856 4= 93.020 (4) V = 1532.40 (14) Å 3 Z = 2 Mo K radiation = 0.69 mm À1 T = 150 K 0.50 Â 0.50 Â 0.27 mm Data collection: X-AREA (Stoe & Cie, 2005); cell refinement: X-AREA; data reduction: X-AREA; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97. diphosphine complexes, of the type [M(CO) 4 {Ph 2 PC(R1R2)PPh 2 }] (M = Mo, W; R1 = H, Me, Et, Pr, allyl, R2 = Me, allyl), have been prepared via elaboration of the methylene backbones in [M(CO) 4 (Ph 2 PCH 2 PPh 2 )] (Ph 2 PCH 2 PPh 2 = dppm) as a result of successive deprotonation and alkyl halide addition (Hogarth & Kilmartin, 2007). The above mentioned chromium complex [Cr(CO) 4 (Ph 2 PCMe 2 PPh 2 )] was prepared also by this way, but not structurally characterized yet (Al-Jibori & Shaw, 1983).…”