Aktivierung von Kohlenstoff‐Kohlenstoff Bindungen durch Chrom(I): Spaltung von Dialkinen durch einen 11‐Elektronenkomplex

Abstract

A 11‐electron T‐shaped chromium(I)‐complex was obtained by reduction of a PNP‐supported chromium (II) iodide complex. Its d5 high spin electronic structure was characterized employing paramagnetic NMR, EPR, UV‐Vis and magnetic measurements (SQUID). The complex readily reacts with conjugated dialkynes to cleave the internal C‐C‐bond, forming the respective acetylide complexes. Varying the alkyne substituents enabled the isolation and characterization of dinuclear dialkynedichromium intermediates which thermally convert to the products.