Journal
APPLIED ORGANOMETALLIC CHEMISTRY
Volume 21, Issue 3, Pages 139-145Publisher
WILEY
DOI: 10.1002/aoc.1183
Keywords
chiral titanium complexes; direct aldol addition; carbonyl-ene reaction
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Hexa- and nonanuclear titanium complexes were obtained by self-assembly of titanium(IV)-tertbutoxide and D-mandelic acid. Suitable single crystals of these complexes were characterized by X-ray structure analysis. When used with these complexes, aldol adducts were isolated with a high degree of regioselectivity in direct aldol additions of aromatic and aliphatic aldehydes to functionalized unsymmetrical ketones. High syn-diastereoselectivities were obtained in aldol additions of enolizable aldehydes with hydroxyacetone and methoxyacetone. Copyright (c) 2007 John Wiley & Sons, Ltd.
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