摘要:
Di-mu(3)-oxo bridging tetranuclear titanium complex (3), obtained by exposing [Ti(OPri)(2)(BINOLato)] (2) to hydrated molecular ;sieves (MS) 4A, is a precursor of active BINOL-Ti catalyst (1). Further treatment of 3 with hydrated MS 4A leads to the mu(3)-oxo titanium cluster (1), which is the efficient asymmetric catalyst for carbonyl-ene reactions. (C) 1999 Elsevier Science S.A. All rights reserved.