Synthese von Tricyclohexylphosphoniumbromiden aus einem luftstabilen Phosphinderivat
作者:Hans Jürgen Bestmann、Reinhard Dötzer
DOI:10.1055/s-1989-27198
日期:——
Synthesis of Tricyclohexylphosphonium Bromides from an Air-Stable Phosphine Derivative Reaction of tricyclohexylphosphine-carbon disulfide complex 5 with primary alkyl bromides 4 produces tricyclohexylphosphonium bromides 1 in good yields, making isolation of the phosphine 3 unnecessary. In two cases for 4g, h, rearranged products were obtained.
New bonding mode of tricyclohexylphosphoniodithiocarboxylate (S<sub>2</sub>CPCy<sub>3</sub>) as an eight-electron donor. Synthesis, reactivity, and X-ray crystal structure of [Mn<sub>2</sub>(CO)<sub>6</sub>(S<sub>2</sub>CPCy<sub>3</sub>)]
作者:Daniel Miguel、Victor Riera、Jesús A. Miguel、Xavier Soláns、Manuel Font-Altaba
DOI:10.1039/c39870000472
日期:——
Mn2(CO)10 with the tricyclohexylphosphine–carbon disulphide adduct S2CPCy3 in refluxing toluene affords the dinuclear complex [Mn2(CO)6(S2CPCy3)](1) in good yield, the structure of which, determined by X-ray crystallography, shows a newmode of co-ordination of the S2CPCy3 ligand which is bonded to an Mn atom by two sulphur atoms and to the other Mn atom by two sulphur and one carbon atom donating 8 electrons;
Preparation and reactivity of mono- and binuclear nitrosyl molybdenum complexes containing S2CPCy3 ligands. Crystal structure of [(OC)2(ON) Mo(μ-Br) (μ-S2CPCy3) Mo(CO)2(PEt3)]
complex 4a can be easily substituted by phosphine or phosphite ligands to give complexes [(OC)2(ON)Mo(μ-Br)(μ-S2CPCy3)Mo(CO)2(L)] (5a: L=PEt3; 5b: L = P(OMe)3). The single crystal X-ray diffraction study of 5a shows that the central carbon atom of the S2CPCy3 ligand is bonded to the molybdenum atom of the ‘Mo(CO)2(PEt3)’ fragment, which is expected to be electron-richer. With potentially bidentate phosphine
Nickel(II), palladium(II), platinum(II) and platinum(IV) complexes of cis-1,2-bis(diphenylphosphino) ethene and nitrogen-containing heterocycles or sulfur ligands
anhydrous Na2S give the trinuclearcomplexes [M3(μ3-S)2(cis-dppen)3]X2 (M=Ni, X−=PF6 (6); M=Pd, X−=BF4 (7)). In the case of 1 Na2S · 9H2O is needed to produce the corresponding Pt(II) complex [Pt3(μ3-S)2(cis-dppen)3] Cl2 (8). Interestingly, treatment of [NiCl2(cis-dppen)] with S2CPCy3 leads to the unexpected mononuclear compound [Ni(CS2)4(cis-dppen)] (BF4)2 (9). Oxidation of [Pt(cis-dppen)2]Cl2 by chlorine
ligand acts as an η1(S);η1(S′) bridge donating two electrons to each metal atom of a symmetrical (CO)4ReRe(CO)4 unit. This unit is presumably formed through a concerted process involving carbonyl/sulfur exchange in the nonsymmetrical octacarbonyl (CO)3(S2CPR3)ReRe(CO)5 generated after the coupling of the bromo derivative with the carbonyl anion. Complexes 3ab can be obtained more directly by adding S2CPR3