期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 690, 期 9, 页码 2163-2171出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2005.01.055
关键词
Schiff bases; macrocyclic ligands; manganese; asymmetric catalysis; epoxidation
A series of chiral macrocyclic Mn(III)Salen complexes has been prepared with two salicylidene moieties linked in their 3 and 3' positions by aliphatic polyether bridges of variable lengths or by a more rigid aromatic junction arm. X-ray structures of ligand precursors and of complex 8 have been performed. All complexes have been used in the asymmetric epoxidation of 1,2-dihydronaphthalene with NaOCl as oxygen atom donor and exhibited modest enantiomeric excesses. Complex 10 was selected to be tested with two cis-disubstituted olefins and several oxidants, namely NaOCl, PhIO and n-Bu4NHSO5. 2,2'-Dimethylchromene oxide was obtained from 2,2'-dimethylchromene with ee values of 56% and 74% when using 10 and NaOCl and PhIO, respectively. (c) 2005 Elsevier B.V. All rights reserved.
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