Phosphinates, chromium complexes

Again, making use of a variety of spectroscopic techniques, the structure and stereodynamics of the M(CO)5[P(o-MeC5H4 )3] complexes (M = Cr, Mo, W) have been reported. Szczecinski has released details of an application of scalar C and couplings between carbonyl carbon atoms and aromatic fluorine atoms to investigate the conformation of chelated phosphitodicarbonylchromium and dicarbonyl(phosphine) chromium complexes of fluorobenzenes. 

The reaction is catalyzed by a group VIII metal species, particularly that of rhodium or palladium. The initial metal species may be any variety of complexes (e.g., PdCl2 Pd acetate, etc.). A source of halide is necessary iodide is especially effective. The most convenient source is methyl iodide, since it is likely a reaction intermediate. In addition, an organic promoter must be included for catalytic activity. These promoters are generally tertiary phosphines or amines. Also, chromium complexes were found to have an important promotional effect. 

C H402, Acetic acid palladium complex, 26 208 tungsten complex, 26 224 C2H7PS, Phosphine sulfide, dimethyl-manganese complex, 26 162 C H,N2, 1,2-Ethanediamine chromium complex, resolution of, 26 24, 27... 

C2H,N, Pyridine, 3,5-dimethyl-palladium complex, 26 210 CbHsNO, Benzoyl isocyanide chromium com-C HbO, Ethanone, 1-phenyl-manganese complex, 26 156-158 CBH, 02, Methyl benzoate chromium complex, 26 32 C H i, o-Xylylene magnesium complex, 26 147 ChH P, Phosphine, dimethylphenyl-iron complex, 26 61 ruthenium complex, 26 273 ChH12, 1,5-Cyclooctadiene iridium complex, 26 122 ruthenium complexes, 26 69-72, 253-256 ChH OjPS, 2-Butenedioic acid, 2-(dimethylphosphinothioyl)-dimethyl ester, manganese complex, 26 163... 

Arene(tricarbonyl)chromium complexes, 19 Nickel boride, 197 to trans-alkenes Chromium(II) sulfate, 84 of anhydrides to lactones Tetrachlorotris[bis(l,4-diphenyl-phosphine)butane]diruthenium, 288 of aromatic rings Palladium catalysts, 230 Raney nickel, 265 Sodium borohydride-1,3-Dicyano-benzene, 279 of aryl halides to arenes Palladium on carbon, 230 of benzyl ethers to alcohols Palladium catalysts, 230 of carboxylic acids to aldehydes Vilsmeier reagent, 341 of epoxides to alcohols Samarium(II) iodide, 270 Sodium hydride-Sodium /-amyloxide-Nickel(II) chloride, 281 Sodium hydride-Sodium /-amyloxide-Zinc chloride, 281 of esters to alcohols Sodium borohydride, 278 of imines and related compounds Arene(tricarbonyl)chromium complexes, 19... 

Chromium complexes (continued) organohalide activation, 5, 381 with phosphine-based supporting ligands, 5, 365 porphyrin-ligated derivatives, 5, 364 pyridinebis(imine) ligand derivatives, 5, 361 salen-ligated complexes, 5, 379 surface chemistry on oxides, 12, 525 tetradentate [04] compounds, 5, 352 tetradentate thioether derivatives, 5, 365 thiolate-bridged, Fe- and Rh complexes, 5, 308 with Ti(IV), 4, 627... 

Phosphine-based supporting ligands, in chromium complexes,... 

Very recently, the benzannulation has been applied to chromium(phosphine)carbonyl complex 34, which is suited for subsequent immobilization by sol-gel methodology the tri-... 

Many P(CH3)3 complexes of the first-row transition metals may be conveniently prepared by direct reaction with the appropriate anhydrous chromium (II), (III),3 cobalt(II),4 iron(II)s or hydrated iron(II),s nickel(II)4a>6,7 salt. The compound [(CH3)3P] 2FeCl2 is the starting material for a variety of phosphine iron complexes.4,8,9... 

The photochemistry of transition carbonyl complexes of chromium or iron with phosphirane or l//-phosphirene ligands is studied with time-dependent DFT theory to explore the propensity of the excited metal-phosphine-carbonyl complexes to expel their ligands <2003JA3558>. The complexes of these phosphorus heterocycles show similar behavior as carbonyl complexes with the PH3 ligand and they differ mainly in their enhanced a-donating ability. The calculations point that the excited complexes prefer the expulsion of the phosphorus substituents, which can be an alternative method to demetalate transition metal complexes of organophosphorus compounds. 

CF3H, Methane, trifluoro-cadmium complex, 24 55 mercury complex, 24 52 CF3NOS, Imidosulfurous difluoride, (fluorocarbonyl)-, 24 10 CH2, Methylene ruthenium complex, 25 182 CH2CI4P2, Phosphine, methylenebis-(dichloro)-, 25 121 CH3, Methyl cobalt complexes, 23 170 mercury complexes, 24 143-145 platinum complex, 25 104, lOS CNO, Cyanato silicon complex, 24 99 CN2OS2, l,3k, 2,4-Dithiadiazol-5-one, 25 53 CO, Carbon monoxide chromium complexes, 21 1, 2 23 87 cobalt complex, 25 177 cobalt, iron, osmium, and ruthenium complexes, 21 58-65 cobalt-osmium complexes 25 195-197 cobalt-ruthenium cluster complexes, 25 164... 

POCisHis, Phosphine, triphenyl-, oxide cerium complexes, 23 178 P03C3H, Trimethyl phosphite chromium complexes, 23 38 cobalt and rhodium complexes, 25 162-163... 

ONChHj, Benzoyl isocyanide, chromium complex, 26 32, 34, 35 ONNiPC22H4, Nickel(II), [2-methylpro-panamidato(2 - )-C yV](tricyclo-hexylphosphine)-, 26 205 ONNiPC22H4o, Nickel(II), [butanami-dato(2 -)-C A/](tricyclohexyl-phosphine)-, 26 206... 

More recently, Weber realized the synthesis of an iron complex of diphosphirane by reaction of the phosphine iron complex ([Fe]—PH2) with P-chlorophosphaalkene (Equation (14)). It was converted into the iron chromium complex, whose structure was elucidated by x-ray analysis <92CB1553>. 

Full details have now appeared of the stereoselective synthesis of 1,5,9-triphosphacyclododecane systems by oxidative liberation from molybdenum and chromium complexes of the macrocycle, obtained by coordination-template controlled reactionsMolybdenum complexes have also been used in the coordination-template dependent synthesis of the macrocyclic P,S system 151. A non-template synthesis of the 14-membered P2S2 macrocycle, 152, isolated in two isomeric forms, has been described. Halogenation of the cyclometallated phosphine 153 leads to a rearrangement, with the formation of the di-phosphinobiphenyl system 154, from which the free diphosphine can be liberated... 

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