Chemistry of Highly Electrophilic Binuclear Cations. 1. Oxidation Reactions of [M<sub>2</sub>(<i>η</i><sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)<sub>2</sub>(CO)<sub>4</sub>(<i>μ</i>-Ph<sub>2</sub>PCH<sub>2</sub>PPh<sub>2</sub>)] (M = Mo, W) with [FeCp<sub>2</sub>]X (X = BF<sub>4</sub>, PF<sub>6</sub>)
作者:M. Angeles Alvarez、Gema García、M. Esther García、Victor Riera、Miguel A. Ruiz、Maurizio Lanfranchi、Antonio Tiripicchio
DOI:10.1021/om990135h
日期:1999.10.1
Oxidation of the title compounds with 2 equiv of [FeCp2]BF4 in dichloromethane leads to the tetracarbonylic fluoro complexes [M2Cp2(μ-F)(CO)4(μ-dppm)]BF4 in high yields (dppm = Ph2PCH2PPh2). By contrast, the analogous reaction with [FeCp2]PF6 gives the tricarbonylic fluoro derivatives [M2Cp2(μ-F)(μ-CO)(CO)2(μ-dppm)]PF6. Separate experiments revealed that the latter cations cannot be obtained through decarbonylation
Reactivity of the Carbyne Complexes [W<sub>2</sub>(<i>μ</i>-COR)(<i>η</i><sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)<sub>2</sub>(CO)<sub>2</sub>(<i>μ</i>-Ph<sub>2</sub>PCH<sub>2</sub>PPh<sub>2</sub>)]<sup>+</sup> (R = H, Me) toward Diazomethane
作者:M. Angeles Alvarez、M. Esther García、Víctor Riera、Miguel A. Ruiz、Francis Robert
DOI:10.1021/om010725r
日期:2002.3.1
suppresses the formation of the alkyne product, whereas the use of a noncoordinating anion such us [B3,5-C6H3(CF3)2}4]- instead of BF4- as counterion precludes the reaction to occur beyond the methoxycarbyne compound. The solution structures of the new compounds are analyzed in the light of the IR and NMR spectra, and plausible reaction pathways are proposed in order to explain the formation of the reaction
Protonation Reactions on the Binuclear Complexes [W<sub>2</sub>Cp<sub>2</sub>(CO)<i><sub>n</sub></i>(<i>μ</i>-L<sub>2</sub>)] [L<sub>2</sub> = Ph<sub>2</sub>PCH<sub>2</sub>PPh<sub>2</sub>, Me<sub>2</sub>PCH<sub>2</sub>PMe<sub>2</sub>; <i>n</i> = 2, 4]. Chemical Behavior of Their Hydrido and Hydroxycarbyne Derivatives
作者:M. Angeles Alvarez、M. Esther García、Víctor Riera、Miguel A. Ruiz
DOI:10.1021/om9806601
日期:1999.2.1
Reaction of the triply bonded dimers [W2Cp2(CO)2(μ-L2)] (L2 = Ph2PCH2PPh2, Me2PCH2PMe2) with HBF4·OEt2 and other strong acids leads to the unsaturated cationic hydrides [W2Cp2(μ-H)(CO)2(μ-L2)]+. In contrast with this, reaction of HBF4·OEt2 with the singly bonded dimers [W2Cp2(CO)4(μ-L2)] leads, depending on L2 and reaction conditions, to either hydroxycarbyne cations [W2(μ-COH)Cp2(CO)2(μ-L2)]+ or hydridoderivatives
Chemistry of Highly Electrophilic Binuclear Cations. 2. Oxidation Reactions of [W<sub>2</sub>(<i>η</i><sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)<sub>2</sub>(CO)<sub>4</sub>(<i>μ</i>-Ph<sub>2</sub>PCH<sub>2</sub>PPh<sub>2</sub>)] with [FeCp<sub>2</sub>][B{3,5-C<sub>6</sub>H<sub>3</sub>(CF<sub>3</sub>)<sub>2</sub>}<sub>4</sub>]
作者:M. Angeles Alvarez、Yvonne Anaya、M. Esther García、Víctor Riera、Miguel A. Ruiz、Jacqueline Vaissermann
DOI:10.1021/om020669+
日期:2003.2.1
Chemical oxidation of the title compound [W2Cp2(CO)(4)(mu-dppm)] (Cp = eta(5)-C5H5; dppm = Ph2PCH2PPh2) with 1 equiv of [FeCp2](BAr4') (Ar' = 3,5-C6H3(CF3)(2)) leads to the tetracarbonyl radical [W2Cp2(CO)(4)(mu-dppm)](BAr4'), which experiences spontaneous decarbonylation to give the 31-electron radical [W2Cp2(mu-CO)(CO)(2)(mu-dppm)](BAr4'). Oxidation of [W2Cp2(CO)(4)(mu-dppm)] with 2 equiv of [FeCp2](BAr4') gives the tricarbonyl derivative [W2Cp2(mu-CO)(CO)(2)(mu-dppm)](BAr4')(2). The same result is obtained when oxidizing the radical [W2Cp2(mu-CO)(CO)(2)(mu-dppm)]-(BAr4') with [FeCp2](BAr4'). The triply bonded complex [W2Cp2(mu-CO)(CO)(2)(mu-dppm)](BAr4')(2), which displays fluxional behavior in solution, reacts with P(OMe)(3) to give [W2Cp2(mu-CO)(CO)P(OMe)(3)}(mu-dppm)](BAr4')(2), the structure of which has been solved through a single-crystal X-ray diffraction study. Reaction of [W2Cp2(mu-CO)(CO)(2)(mu-dppm)](BAr4')(2) with salts of halide ions X- (X = Cl, Br, I) gives the corresponding halo derivatives [W2Cp2(mu-X)(mu-CO)(CO)(2)(mu-dppm)] (BAr4'). When X = I, a mixture of two isomers differing in the relative positions of the bridging halide and carbonyl is obtained. The same halide compounds were obtained in the reactions of paramagnetic [W2Cp2(mu-CO)(CO2(mu-dppm)]-(BAr4') with halogens X-2. The tricarbonyl radical was found to react slowly with water to give the known hydroxycarbyne derivative [W2Cp2(mu-COH)(CO2(mu-dppm)](BAr4').
Alvarez, M. Angeles; Garcia, M. Esther; Riera, Victor, Angewandte Chemie, 1993, vol. 105, p. 1232 - 1233
作者:Alvarez, M. Angeles、Garcia, M. Esther、Riera, Victor、Ruiz, Miguel A.、Bois, Claudette、Jeannin, Yves