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A glimpse into the chemical reactivity of the unsaturated hydride [MoWCp2(H)(μ-PCy2)(CO)2]
Journal of Organometallic Chemistry ( IF 2.1 ) Pub Date : 2021-01-16 , DOI: 10.1016/j.jorganchem.2021.121708
M. Angeles Alvarez , M. Esther García , Daniel García-Vivó , Estefanía Huergo , Miguel A. Ruiz

The unsaturated hydride [MoWCp2(H)(μ-PCy2)(CO)2] (1) reacted rapidly with stoichiometric amounts of different isocyanides at room temperature to give two types of formimidoyl derivatives: the symmetrically bridged complexes [MoWCp2(μ-η2:η2-CHNR)(μ-PCy2)(CO)2] [R = tBu (2a), 4-C6H4OMe (2b)], and the asymmetrically bridged complex [MoWCp2(μ-1κC:2κN-HCNR)(μ-PCy2)(CO)2] [R = Xyl (3)], with the latter compound undergoing slow rearrangement above 293 K to give the aminocarbyne isomer [MoWCp2{μ-CNH(Xyl)}(μ-PCy2)(CO)2] (4). The reaction of 1 with excess CNtBu led to the double addition product [MoWCp2(μ-H)(μ-PCy2)(1κ-CNtBu)(2κ-CNtBu)(1κ-CO)(2κ-CO)] (5), whereas the reaction with excess CN(4-C6H4OMe) at room temperature gave a mixture of two complexes having 5-electron donor aminocarbene-iminoacyl ligands: [MoWCp2(μ-1η2:2κC,κ-HCN(4-C6H4OMe)C{N(4-C6H4OMe)})(μ-PCy2)(CO)2] (6) and [MoWCp2(μ-1κC,κ:2η2-HCN(4-C6H4OMe)C{N(4-C6H4OMe)})(μ-PCy2){2κ-CN(4-C6H4OMe)}(1κ-CO)] (7) following from formimidoyl-isocyanide coupling. The title hydride reacted with N2CH(SiMe3) to give the addition product [MoWCp2(1κ-H)(μ-PCy2)(2κ-CO)2{1κ-N2CH(SiMe3)}] (8c), in which the coordinated diazoalkane acts formally as an imido-like four-electron donor group. Reaction with N2CPh2 led instead to a mixture of four products derived from the addition of either one molecule of diazoalkane: [MoWCp2(1κ-H)(μ-PCy2)(2κ-CO)2(1κ-N2CPh2)] (8d-W) and [MoWCp2(2κ-H)(μ-PCy2)(1κ-CO)2(2κ-N2CPh2)] (8d-Mo), or two molecules of the reagent: [MoWCp2(2κ-H)(μ-PCy2)(2κ-CO)2(1κ-N2CPh2)2] (9d-Mo) and [MoWCp2(1κ-H)(μ-PCy2)(1κ-CO)2(2κ-N2CPh2)2] (9d-W). These latter products lack of a metal−metal bond due to a dissimilar electron donation from the diazoalkane ligands, which act as 2- and 4-electron donors, respectively. Reaction of 1 with excess (p-tol)C(O)H (p-tol = 4-C6H4Me) in refluxing toluene gave the oxoacyl complex [MoWCp2{μ-1κC:2η2-C(O)CH2(p-tol)}(1κ-O)(μ-PCy2)(2κ-CO)] (10) as the unique product, following from C–O bond cleavage of the incoming reagent. Finally, compound 1 reacted with HC2(p-tol) at room temperature to give a mixture of the α-substituted alkenyls trans-[MoWCp2{μ-κ:η2-C(p-tol)CH2}(μ-PCy2)(CO)2] (trans-11) and cis-[MoWCp2{μ-1κ:2η2-C(p-tol)CH2}(μ-PCy2)(CO)2] (cis-11) in a ratio ca. 7/1, whereas the reaction in refluxing toluene led to mixtures of the β-substituted alkenyls trans-[MoWCp2{μ-1κ:2η2-CHCH(p-tol)}(μ-PCy2)(CO)2] (trans-12) and cis-[MoWCp2{μ-κ:η2-CHCH(p-tol)}(μ-PCy2)(CO)2] (cis-12) in a ratio ca. 10/1, with the former α-substituted complexes fully rearranging into the β-substituted alkenyls rapidly at 363 K, as shown by independent experiments.



中文翻译:

窥探到不饱和氢化物的化学反应性[MoWCp 2(H)(μ -PCy 2)(CO)2 ]

不饱和氢化物[MoWCp 2(H)(μ- PCy 2)(CO)2 ](1)在室温下与化学计量的不同异氰酸酯快速反应,生成两种类型的甲亚胺基衍生物:对称桥连的配合物[MoWCp 2μ - η 2η 2 -CHNR)(μ -PCy 2)(CO)2 ] [R = BU(图2a),4-C 6 H ^ 4 OME(图2b)],以及非对称桥联配合物[MoWCp 2μ-1 κ Ç:2 κ Ñ -HCNR)(μ -PCy 2)(CO)2 ] [R =的Xyl(3)],其中后者化合物经受上述293度缓慢重排,得到异构体aminocarbyne [MoWCp 2 { μ- CNH(Xyl)}(μ- PCy 2)(CO)2 ](4)。的反应1与过量的CN卜导致双加成产物[MoWCp 2μ -H)(μ -PCy 2)(1 κ -CN卜)(2 κ-CN t Bu)( -CO)( -CO)](5),而在室温下与过量CN(4-C 6 H 4 OMe)的反应则得到两种具有5个电子的配合物的混合物施主aminocarbene-亚氨基配体:[MoWCp 2μ -1 η 2:2 κ çκ C' -HCN(4-C 6 H ^ 4 OME)C {N(4-C 6 H ^ 4 OME)})(μ -PCy 2)(CO)2 ](6)和[MoWCp 2μ-1 κ Çκ C':2 η 2 -HCN(4-C 6 H ^ 4 OME)C {N(4-C 6 H ^ 4 OME)})(μ -PCy 2){2 κ -CN(4- -C 6 H 4 OMe)}( -CO)](7)之后是甲酰亚胺基-异氰化物偶联。标题氢化物与N 2 CH(森达3),得到的加成产物[MoWCp 2(1 κ -H)(μ -PCy 2)(2 κ -CO)2 {1κ- N 2 CH(SiMe 3)}](8c),其中配位重氮烷烃形式上像亚氨基样四电子供体基团。用N反应2器CPh 2代替导致从加法重氮烷中的任一种分子的衍生的四种产品的混合物:[MoWCp 2(1 κ -H)(μ -PCy 2)(2 κ -CO)2(1 κ -N 2器CPh 2)](8D-W )和[MoWCp 2(2 κ -H)(μ -PCy 2)(1 κ-CO)2(2 κ -N 2器CPh 2)](8D-Mo系),或者所述试剂的两个分子:[MoWCp 2(2 κ -H)(μ -PCy 2)(2 κ -CO)2( 1 κ -N 2器CPh 22 ](9D-沫)和[MoWCp 2(1 κ -H)(μ -PCy 2)(1 κ -CO)2(2 κ -N 2器CPh 22 ](9d-W)。后面的这些产品缺乏金属-金属键,这是由于重氮烷配体提供的电子不同,它们分别充当2和4电子给体。的反应1与过量的(p -tol)C(O)H(p -Tol = 4-C 6 H ^ 4 Me)中在回流的甲苯,得到氧代酰基配合物[MoWCp 2 { μ -1 κ Ç:2 η 2 -C (O)CH 2p -tol)}(1 κ = O)(μ -PCy 2)(2 κ -CO)](10)作为独特的产品,是通过进料试剂的C–O键裂解而实现的。最后,化合物1与HC反应2p在室温下-tol),得到的混合物α取代的链烯基的反式- [MoWCp 2 { μ - κ:η 2 -C(p -tol)CH 2 }(μ -PCy 2)(CO)2 ](反式-11)和顺式- [MoWCp 2 { μ -1 κ:2 η 2 -C(p-tol)CH 2 }(μ- PCy 2)(CO)2 ](顺式-11)的比率为ca。7/1,而在回流甲苯导致的混合物的反应β取代的链烯基的反式- [MoWCp 2 { μ -1 κ:2 η 2 -CHCH(p -tol)}(μ -PCy 2)(CO)2 ](反式-12)和顺式- [MoWCp 2 { μ - κ:η 2 -CHCH(p-tol)}(μ- PCy 2)(CO)2 ](-12)的比率为ca。如独立实验所示,前者α-取代的配合物以10/1的速率完全在363K下迅速重排成β-取代的烯基。

更新日期:2021-01-29
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