Acetonitrile, molybdenum and tungsten complexes

Acetonitrile, molybdenum and tungsten complexes, 26 122, 133 osmium complex, 26 290 palladium complex, 26 128 ruthenium complex, 26 356 ruthenium(II) complex, 26 69... 

Compound 79 reacts with 0(CH2)4 and NCMe in the presence of CFsSOsMe, like the iron complex 11 and the molybdenum and tungsten complexes 45 and 46, to give zwitterionic compounds [2-NO-2-PEt3-7-L-c/ow-2,l-CoCBioHio] [L = 0(CH2)4 (83), NCMe (84)]. Interestingly, the acetonitrile reaction gave in addition to 84 small amounts of the imine complex [7- N(Me) = C(H)Me -2-NO-2-PEt3-c/oio-2,l-CoCBioHio] (85), a product related to the iron and nickel compounds 34 and 78, respectively. The latter pair were the only products when 11 and 75, respectively, were... 

Bis[dw-butyLphosphano] tellurium replaces norbornadiene, cycloheptatriene, acetonitrile, and dimethyl(methylene)oxosulfurane in chromium, molybdenum, and tungsten complexes. The P —Te compound acts as a bidentate ligand with the two phosphorus atoms coordinated to the metal atom1. The tetracarbonylchromium complex [R = CH(CH3)J can be recrystallized without loss of tellurium2. 

Tricarbonyl(6,6-diphenylfulvene)chromium(0) (52) was obtained by reaction of 6,6-diphenylfulvene with hexacarbonylchromium in 64% yield [56]. Later it was shown that almost quantitative yields can be obtained under photochemical reaction conditions starting from (benzene)Cr(CO)3 or from (mesitylene)Cr(CO)3 as the complexation reagent [63]. The corresponding molybdenum and tungsten complexes were prepared by treatment of the ligands with tris(acetonitrile)M(CO)3 (M = Mo, W) [64]. Olefin complex 53 was obtained by Wilkinson and Altman in 51% yield from 6,6-diphenylfulvene and bis(dicarbonylchlororhodium). Similar complexes were prepared with other rhodium reagents [58]. Hiibel and Weiss [59] prepared the diene tri-carbonyliron complex 54 (11-30%) in addition to the dinuclear complex, in which either one of the endocyclic double bonds is coordinated at Fe(CO)4 (49-66%). 

Treatment of bis(pyridine) complexes of molybdenum and tungsten, M(f/ -allyl)Cl(CO)2(py)2 (M = Mo, W) with equimolar amounts of lithium amidinates Li[RC(NPh)2] (R = H, Me) afforded amidinato complexes of the type M(r -allyl)[RC(NPh)2](CO)2(py) (M = Mo, W). Reactions of the latter with acetonitrile, PEts, and P(OMe)3 have been investigated Free amidines react with M(r -allyl)Cl(CO)2(NCMe)2 according to Scheme 124 to give the corresponding bis(amidine) complexes. ... 

C2H,N, Acetonitrile, cobalt, copper, and ruthenium complexes, 26 356, 359 molybdenum, palladium, and tungsten complexes, 26 128-133 osmium complex, 26 290, 292 ruthenium(II) complexes, 26 69-72 C2H4, Ethene, molybdenum complex, 26 102-105... 

Tricarbonylchromium,221 -molybdenum,221 -tungsten,221 and-ruthenium222 complexes of 1H-azepine-l-carboxylatcs have been prepared by treating the azepines with tris(acetonitrile)tricar-bonylchromium(O), tricarbonyldiglymemolybdenum(O), tris(acetonitrile)tricarbonyltung-sten(O), and dodecacarbonylruthcnium(O), respectively. 

The dicarbonylbis( 4-l,3-cyclohexadiene)molybdenum(0) (9g) and tungsten (1 lg) complexes are formed only in moderate yields, photochemically. They are readily accessible, however, by thermal reactions of the respective tricarbonyltris(acetonitrile)metal(0) complexes (19) and lg (20). 

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