European Journal of Inorganic Chemistry
European Journal of Inorganic Chemistry
4 years ago

New Highly Active Salen-based Aluminum Catalyst for the Coupling of Carbon Dioxide with Epoxides at Ambient Temperature

Kyunglim Hyun, Junseong Lee, Won Hee Woo, Youngjo Kim, Yoseph Kim, Min Kim, Myung Hwan Park, Ji Yeon Ryu
A novel aluminum complex, [(naph)salen]AlMe [(naph)salen = N,N'-(2,3-naphthalene)bis(3,5-dimethylsalicylideneiminato)], has been synthesized and fully characterized by NMR spectroscopy, high-resolution mass spectrometry, elemental analysis, and single-crystal X-ray diffraction. The complex exhibits square pyramidal geometry around the aluminum center in the solid-state structure, and it has a trigonality parameter (τ) of 0.13. Comparison of the catalytic activity of [(naph)salen]AlMe with that of four related aluminum complexes containing tetradentate salen ligands with different bridging groups revealed that the naphthyl bridged salen-based aluminum complex, in conjunction with tetra(n-butyl)ammonium iodide as a cocatalyst, showed higher catalytic activity than the other complexes for the coupling of CO2 with epoxides under the mild conditions of room temperature and 5 bar of CO2 in 12 h. In addition, the new salen complex [(naph)salen]AlMe showed favorable features, such as requiring low catalyst loading (0.5 mol%) and broad epoxide substrate scope, including six terminal epoxides and three internal epoxides.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201701169

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