The X‐ray Crystal Structure of a Cuprate–Carbonyl π‐Complex

Abstract

π! – aber wie? Die erste Röntgenkristallstruktur eines Cuprat‐Carbonyl‐π‐Komplexes – und überhaupt eines π‐Komplexes aus einem Organocuprat und einer Doppelbindung jedweder Art – wurde für ein Intermediat der Reaktion von Me2CuLi mit Fluorenon erhalten (siehe Schema).

Synthesis of new derivatives of copper complexes of Josiphos family ligands for applications in asymmetric catalysis

“…5 However recently it has been shown that transmetallated Cu-species are capable of π-complex formation with a conjugated carbonyl moiety also. 25 Our present empirical data indicate that the presence of an α-substituent at the enone 7 destabilizes the formation of πand σ-complexes with a conjugated double bond. This most likely drives the Cu-catalyst to form π-complexes with the carbonyl of the enone, followed by formation of the 1,2-addition product (Table 1).…”