Abstract
Durch einfache Variation der Reaktionsbedingungen kann bei der Addition von Et2Zn an Aldehyde in Gegenwart des Spirotitanats 1 die Konfiguration des Produkts umgekehrt werden: Stöchiometrische Mengen des Spirotitanats bewirken Re‐Addition von Et2Zn an Aldehyde (bis 98% ee). In Gegenwart von äquimolaren Mengen Ti(OCHMe2)4 induzieren katalytische Mengen von 1 dagegen die Si‐Addition von Et2Zn (bis 99% ee). magnified image
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