Asymmetric Diels-Alder reactions using platinum complexes of BINAP, or of conformationally flexible NUPHOS-type diphosphines, have been compared in dichloromethane and selected ionic liquids. Significant enhancements in the enantioselectivity (Deltaee approximate to 20%), as well as reaction rate, were achieved in ionic liquids compared with the organic media.
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Doherty, S., Goodrich, P., Hardacre, C., Luo, H-K., Rooney, D., Seddon, K., & Styring, P. (2004). Marked enantioselectivity enhancements for Diels-Alder reactions in ionic liquids catalysed by platinum diphosphine complexes. Green Chemistry, 6(1), 63-67. https://doi.org/10.1039/b312761c