A Frustrated Lewis Pair Based on a Cationic Aluminum Complex and Triphenylphosphine

A Frustrated Lewis Pair Based on a Cationic Aluminum Complex and Triphenylphosphine
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基于阳离子铝配合物和三苯基膦的受阻路易斯对

DOI:
10.1021/acs.organomet.5b00927
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发表时间:
2016
期刊:
影响因子:
2.8
通讯作者:
S. Harder
S. Harder
中科院分区:
化学2区
文献类型:
--
作者:
T. E. Stennett;J. Pahl;H. S. Zijlstra;F. W. Seidel;S. Harder

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高路易斯酸性阳离子铝物质 [DIPP-nacnacAlMe]+[B(C6F5)4]−(1, DIPP-nacnac = [HC{C(Me)N(2,6-iPr2C6H3)}2]−) 已被证明在存在和不存在外部弱膦碱 PPh3 的情况下与各种小分子发生反应。报道了二酮亚胺酸铝骨架上不饱和 C-C 键的环加成反应,并首次对此类环加成产物进行了结构确认。添加 PPh3to1 生成阳离子铝膦络合物 [DIPP-nacnacAl(Me)PPh3]+[B(C6F5)4]−,其在溶液中经历膦的不断解离/配位。这种弱的 Al-P 相互作用可用于受阻路易斯对类型反应,以激活烯烃、炔烃、CO2、环氧丙烷和 CH2Cl2 的 C-Cl 键。 CO2 加合物 [DIPP-nacnacAl(Me)OC(PPh3)O]+[B(C6F5)4]− 经过 Et3SiH 的进一步化学计量还原,产生甲酸铝物质。
The highly Lewis acidic, cationic aluminum species [DIPP-nacnacAlMe]+[B(C6F5)4]−(1, DIPP-nacnac = [HC{C(Me)N(2,6-iPr2C6H3)}2]−) has been shown to undergo reactions with a wide variety of small molecules, in both the presence and absence of an external weak phosphine base, PPh3. Cycloaddition reactions of unsaturated C–C bonds across the aluminum diketiminate framework are reported, and the first structural confirmation of this type of cycloaddition product is presented. Addition of PPh3to1produces the cationic aluminum phosphine complex [DIPP-nacnacAl(Me)PPh3]+[B(C6F5)4]−, which undergoes fluxional dissociation/coordination of the phosphine in solution. This weak Al–P interaction can be utilized in frustrated Lewis pair type reactions to activate alkenes, alkynes, CO2, propylene oxide, and the C–Cl bonds of CH2Cl2. The CO2adduct [DIPP-nacnacAl(Me)OC(PPh3)O]+[B(C6F5)4]−undergoes further stoichiometric reduction with Et3SiH to produce an aluminum formate species.
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