Facile Synthesis of (Imido)vanadium(V)−Alkyl, Alkylidene Complexes Containing an N-Heterocyclic Carbene Ligand from Their Trialkyl Analogues
Facile Synthesis of (Imido)vanadium(V)−Alkyl, Alkylidene Complexes Containing an N-Heterocyclic Carbene Ligand from Their Trialkyl Analogues
复制标题
DOI：
10.1021/om8007822
复制
发表时间：
2008-11
期刊：
影响因子：
2.8
通讯作者：
Wenjuan Zhang;K. Nomura
中科院分区：
文献类型：
--
作者：
Wenjuan Zhang;K. Nomura
（亚氨基）钒（V）−烷基、亚烷基配合物，含有N-杂环卡宾（NHC）配体，V（CHSiMe 3）（NR）（CH 2SiMe 3）（NHC）[R = 1-金刚烷基（Ad）或2，6-Me 2C 6 H3（Ar），NHC = 1，3-双（2，6-二异丙基苯基）咪唑-2-亚基]的合成（CH 2SiMe 3）3，在NHC存在下，通过C6 D 6中的α-氢消除。V（CHSiMe 3）（NAd）（CH 2SiMe 3）（NHC）中的V-C（NHC）键距[2.172（2）A]比V-C（alkylidene）[1.829 A]和V-C（alkyl）[2.069 A]长得多，表明NHC在高氧化态的钒（V）−alkylidene作为中性卡宾配体的稳定化中起着重要作用。
(Imido)vanadium(V)−alkyl, alkylidene complexes containing an N-heterocyclic carbene (NHC) ligand, V(CHSiMe3)(NR)(CH2SiMe3)(NHC) [R = 1-adamantyl (Ad) or 2,6-Me2C6H3 (Ar), NHC = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene], have been prepared from the trialkyl analogues, V(NR)(CH2SiMe3)3, by α-hydrogen elimination in C6D6 in the presence of NHC. The V−C(NHC) bond distance [2.172(2) A] in V(CHSiMe3)(NAd)(CH2SiMe3)(NHC) is much longer than the V−C(alkylidene) [1.829 A] and the V−C(alkyl) [2.069 A] distances, indicating that NHC plays an important role in the stabilization of the high-oxidation-state vanadium(V)−alkylidene as a neutral carbene ligand.