Addition of Alkynes to a Gallium Bis-Amido Complex: Imitation of Transition-Metal-Based Catalytic Systems
作者:Igor L. Fedushkin、Alexander S. Nikipelov、Alexander G. Morozov、Alexandra A. Skatova、Anton V. Cherkasov、Gleb A. Abakumov
DOI:10.1002/chem.201102243
日期:2012.1.2
Acetylene, phenylacetylene, and alkylbutynoates add reversibly to (dpp‐bian)Ga–Ga(dpp‐bian) (dpp‐bian=1,2‐bis[(2,6‐diisopropylphenyl)‐imino]acenaphthene) to give addition products [dpp‐bian(R1CCR2)]Ga–Ga[(R2CCR1)dpp‐bian]. The alkyne adds across the GaNC section, which results in new carbon–carbon and carbon–gallium bonds. The adducts were characterized by electron absorption, IR, and 1H NMR spectroscopy
乙炔,苯乙炔和烷基丁酸酯可逆地添加到(dpp-bian)Ga-Ga(dpp-bian)(dpp-bian = 1,2-双[(2,6-二异丙基苯基)-亚氨基] ac)中,以生成其他产物[ DPP-扁(R 1 CCR 2)] Ga的嘎[(R 2 CCR 1)DPP-扁]。炔横跨镓添加 Ñ C部件,这导致新的碳-碳和碳-镓键。加合物的特征在于电子吸收,IR和1H NMR光谱及其分子结构已通过单晶X射线分析确定。根据X射线数据,镓的配位数从三个[dpp-bian] Ga–Ga(dpp–bian)变为四个(加合物中)导致金属-金属键的延长约0.13Å。加合物在升高的温度下容易进行炔烃消除。甲苯溶液中[dpp-bian(PhCCH)] Ga-Ga [(HCCPh)dpp-bian]和[(dpp-bian)Ga-Ga(dpp-bian)+ 2PhCCH]之间的平衡通过1 H NMR光谱研究。平衡常数在不同温度下(298≤