Ultrasound induced, copper mediated homocoupling using polymer supported aryltrifluoroborates
摘要:
Using Dowex polymer supported aryltrifluoroborates, we are able to achieve homocoupling for a variety of compounds. The reactions were completed in 6 h, while producing high yields of the desired products. The reaction proceeds under mild conditions, using ultrasound as the energy source, copper acetate as the metal co-reactant, and aqueous ethanol as solvent. (C) 2013 Elsevier Ltd. All rights reserved.
Asymmetric epoxidation of unfunctionalized olefins with C2-symmetrical diphenol-derived axially coordinated homogeneous chiral bi-Mn(III) salen complexes
作者:Tianyi Dong、Xiaoju Wu、Jiali Cai、Jing Huang
DOI:10.1016/j.inoche.2019.01.010
日期:2019.3
coordinated homogeneous chiral bi-Mn(III) salen complexes are synthesized and their catalytic effects in asymmetric epoxidation of unfunctionalized olefins are investigated in details. The results show that excellent enantioselectivities and high activities are achieved (enantioselectivities up to >99% in 99.9%) in the absence of expensive NMO. Compared with Jacobsen'scatalyst, the configuration of C2-symmetrical