On the synthesis and 31P{1H} NMR spectrum of (CO) 5W(μ-PPh2CH2PPh2) W(CO)5
摘要:
The dimetallic complex, (CO)(5)W(mu-PPh(2)CH(2)PPh(2))W(CO)(5), is synthesized from either a 2:1 mixture of (CO)(5)W(NCMe) and (CO)(5)W(eta(1)-PPh(2)CH(2)PPh(2)) or a 3:1 mixture of (CO)(5)W(NCMe) and PPh(2)CH(2)PPh(2) in toluene at 60 degrees C. The coupling constants, (2)J(PP') = 22.9 Hz, (1)J(WP) = 246.9 Hz and (3)J(WP') = 4.5 Hz are consistent with those reported in the literature for similar complexes. The complex (CO)(5)W(eta(1)-PPh(2)CH(2)PPh(2)) is stable with respect to chelation at room temperature.
Catalysed and uncatalysed substitution reactions of [W(CO)5(NCR)] (R = Me, Et)
作者:Cheryl-Ann Dickson、Anne W. McFarlane、Neil J. Coville
DOI:10.1016/s0020-1693(00)80834-8
日期:1989.4
Abstract The reaction between [W(CO)5(NCR)] (R = Me, Et) and tBuNC in the presence of PdO yielded both [W(CO)4(CNBut)2] and [W(CO)4(NCR)(CNBut)] and revealed that both RCN and CO are catalytically replaced by tBuNC. Reaction of a 2:1 mixture of [W(CO)5(NCMe)] and PPh2(CH2)nPPh2 (P-P; n = 2, 5) in toluene at 55 °C gave a product mixture consisting of the bridged complex [W(CO)5(P-P)W(CO)5] (dominant product)
摘要[W(CO)5(NCR)](R = Me,Et)与tBuNC在PdO存在下的反应产生了[W(CO)4(CNBut)2]和[W(CO)4(NCR) )(CNBut)],并发现RCN和CO均被tBuNC催化取代。[W(CO)5(NCMe)]与PPh2(CH2)nPPh2(PP; n = 2,5)的2:1混合物在甲苯中于55°C反应,得到由桥联配合物[W]组成的产物混合物(CO)5(PP)W(CO)5](主要产物)和螯合物[W(CO)4(PP)]。出乎意料的是,当与PPh2(CH2)nPPh2(n = 4,5)的反应在CHCl3中进行时,螯合物[W(CO)4(PP)]是主要产物。
Thiosemicarbazone platinacycles with tertiary phosphines. Preparation of novel heterodinuclear platinum–tungsten complexes
作者:Darío Lata、M. Teresa Pereira、Juan M. Ortigueira、Javier Martínez、Brais Bermúdez、Jesús J. Fernández、José M. Vila
DOI:10.1016/j.poly.2012.04.015
日期:2012.6
afforded the tetranuclear platinum(II) compounds [Pt(R1C6H3)C(H) NN C(S)NHR2}]4 (1a–1f) with the ligand as terdentate [C,N,S] after C–H activation and NH deprotonation. The reaction of 1a–1f with PPh3 in 1:4 M ratio gave the mononuclear compounds [Pt(R1C6H3)C(H) NN C(S)NHR2}(PPh3)] (2a–2f). Treatment of 1a–1f with large-bite diphosphines Ph2P(CH2)nPPh2 (n = 2, dppe; n = 3, dppp; n = 4, dppb) afforded the
Cycloplatination of Thiosemicarbazones Derived from Furane. Crystal and Molecular Structure of [{Pt[(OC4H2)C(Me)=NN=C(S)NHEt]}2{μ-Ph2P(CH2)2PPh2}]
作者:Luis Adrio、José M. Antelo、Juan M. Ortigueira、Darío Lata、Teresa Pereira、Margarita López-Torres、José M. Vila
DOI:10.1002/zaac.200700244
日期:2007.9
Treatment of thiosemicarbazones (OC4H3)C(Me)=NN(H)C(=S)NHR (R: Me, a; Et, b) with [cis-PtMe2(cod)] afforded the tetranuclear compounds [Pt(OC4H2)C(Me)=NN=C(S)NHR}]4 (R: Me, 1a; Et, 1b). The reaction of 1a and 1b with triphenylphosphine in 1:4 molar ratio gave rise to the mononuclear compounds [Pt(OC4H2)C(Me)=NN=C(S)NHR}(PPh3)] (2a, 2b). Treatment of 1a and 1b with large-bite diphosphines Ph2P(CH2)nPPh2
Synthesis and reactivity of dinuclear iron–platinum, chromium–platinum, molybdenum–platinum and tungsten–platinum complexes with bridging carbonyl, isocyanide and aminocarbyne ligands. An empirical study on the parameters decisive for the bonding mode of the isocyanide ligand
isocyanide ligand in a bridging bonding mode. Upon protonation of 2 and 3b with HBF4, the stable μ-aminocarbyne complexes [(OC)4M(μ-CN(H)R′)(μ-dppm)Pt(PPh3)][BF4] (10–11) are formed by electrophilic addition of H+ on the basic isonitrile nitrogen atom. The molecular structures of 1a,c, 2 and 3c have been determined by X-ray diffraction methods. The μ-CO and the μ-CNR ligands bridge the metalcentres in an
dppm桥接的异双金属μ-羰基配合物[(OC)4 M(μ-CO)(μ-dppm)Pt(PPh 3)](1a,M = Cr; 1b,M = Mo; 1c,M = W)已经制备由[M(CO)的反应5(η 1 -dppm)](M =铬,钼,W)与[PT(CH 2 CH 2)(PPH 3)2 ]。化学计量的异氰酸酯加到1的结果是由CNR的π接受电子控制的。带有强吸电子取代基R的异氰酸酯配体的加成提供了异腈桥联的配合物[(OC)4 M(μ-CN–R)(μ-dppm)Pt(PPh 3)] 2(M = W; R = CF 3),3(3a,M = Cr; 3b M = Mo,3c M = W; R = CH 2 SO 2 p-甲苯基)和4(M = W; R = [CH 2 PPh 3 ] [PF 6 ]。较少的π-接受异氰酸酯(R = CH 2 Ph,C 6 H 11,CH 2 PO(OEt)2),不稳
Studies of a Reluctant Ligand. An X-ray Crystallographic and NMR Spectroscopic Analysis of (OC)<sub>5</sub>W(η<sup>1</sup>-PPh<sub>2</sub>CH<sub>2</sub>PPh<sub>2</sub>) and Its (OC)<sub>5</sub>W(μ-PPh<sub>2</sub>CH<sub>2</sub>PPh<sub>2</sub>)W(CO)<sub>5</sub> Derivative
作者:John William Benson、Richard L. Keiter、Ellen A. Keiter、Arnold L. Rheingold、Glenn P. A. Yap、Vera V. Mainz
DOI:10.1021/om980288p
日期:1998.9.1
Tungsten pentacarbonyl complexes, (OC)5W(η1-PPh2CH2PPh2) (1) and (OC)5W(μ-PPh2CH2PPh2)W(CO)5 (2), have been synthesized from (OC)5WNH2Ph and Ph2PCH2PPh2 in toluene, and their solid-state structures have been determined by single-crystal X-ray diffraction. The lone pair of electrons on the dangling phosphine in 1 is oriented toward the W(CO)5 unit in the solid state, and 13C1H} and 31P1H} NMR data