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- W2078279778 startingPage "133" @default.
- W2078279778 abstract "Abstract Chiral salen ligands capable of forming polymetallic complexes have been designed. The ligands possess substituents in the 4,4′-positions, but have no substituent in the 3,3′-positions to allow a second metal ion access to the salen oxygen atoms. Ligands in which a polyether chain links the 4,4′-positions were prepared and complexed to copper. In addition, acyclic ligands with potential metal coordinating substituents in the 4,4′-positions were prepared and complexed to copper and cobalt. The crystal structure of one of the cobalt complexes shows it to be a trimetallic complex in which a Co(II)(OAc)2 group coordinates to the salen oxygen atoms of two Co(III)(salen)(OAc) units. In contrast, the crystal structure of a Co(salen) complex with tert-butyl groups attached to the 3,3′-positions is found to be mononuclear. All of the complexes were tested as asymmetric phase transfer catalysts for the asymmetric alkylation of an alanine methyl ester, forming (R)-α-methyl phenylalanine methyl ester with up to 85% ee." @default.
- W2078279778 created "2016-06-24" @default.
- W2078279778 creator A5027434411 @default.
- W2078279778 creator A5033495838 @default.
- W2078279778 creator A5073142523 @default.
- W2078279778 creator A5091708807 @default.
- W2078279778 date "2012-01-01" @default.
- W2078279778 modified "2023-10-16" @default.
- W2078279778 title "Chiral salen ligands designed to form polymetallic complexes" @default.
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