Trifluormethylisocyanid, ein starker π‐Akzeptor‐Ligand — Pentacarbonyl(trifluormethylisocyanid)chrom und ‐wolfram

Trifluoromethyl Isocyanide, a Strong π‐Accepting Ligand – Pentacarbonyl(trifluoromethyl isocyanide)chromium and ‐tungsten Trifluoromethyl isocyanide (2) reacts with (CO)5M(THF) (1a,b;a: M = Cr, b: M = W) to form the new complexes (CF3NC)M(CO)5 (3a, b). From the vibrational spectra, which resemble those of the hexacarbonyl complexes, it is concluded, that the new ligand is a strong π‐acceptor.