A Dimetalloxycarbene Bonding Mode and Reductive Coupling Mechanism for Oxalate Formation from CO<sub>2</sub>
作者:Albert Paparo、Jared S. Silvia、Christos E. Kefalidis、Thomas P. Spaniol、Laurent Maron、Jun Okuda、Christopher C. Cummins
DOI:10.1002/anie.201502532
日期:2015.7.27
4[B(C6F5)4], was simply deprotonated with the strong base K(N(SiMe3)2) to give 5. Complex 5 reacts smoothly with CO2 to generate the bridging oxalate complex [(TiX3)2(μ2‐C2O4‐κO:κO′′)], 6, in a CC bond formation reaction commonly anticipated for oxalate formation by reductive coupling of CO2 on low‐valent transition‐metal complexes.
我们描述了稳定的和可分离的dimetalloxycarbene [(TIX 3)2(μ 2 -CO 2 -κ 2 Ç,ø:κ ø ')] 5,其中X = ñ - (叔丁基)-3,5-二甲苯胺,这是由波动μ稳定2 -κ 2 ç,ø:κ 1 ö '卡宾碳的双核的两个中心钛复合物的协调5,如由变温NMR研究。未修饰分子的量子化学计算表明,仅+10.5 kJ mol的较高能量-1用于μ 2 -κ 1 ö:κ 1 Ö '相比μ自由dimetalloxycarbene的键合方式2 -κ 2 Ç,ø:κ 1 ö掩蔽dimetalloxycarbene的键合方式“。母体阳离子桥接甲酸配合物[(TIX 3)2(μ 2 -OCHO-κ ø:κ ø ')] [B(C 6 ˚F 5)4 ],4 [B(C 6 ˚F 5)4],简单地用强碱K(N(SiMe 3)2)去质子化,得到5。复杂5起反应顺利用CO 2以产生桥接草酸盐配合物[(TIX