REACTIONS OF PENTACARBONYL(TRIFLUOROMETHYL ISOCYANIDE)CHROMIUM WITH NUCLEOPHILES

Reactions of Pentacarbonyl(trifluoromethyl isocyanide)chromium with Nucleophiles Pentacarbonyl(trifluoromethyl isocyanide)chromium (1) reacts with nucleophilic reagents like secondary amines (2a‐d), 1,2‐dimethylhydrazine (2e), or methanol (2f). The first nucleophilic attack occurs at the isocyanide carbon atom. The formed Fischer‐type carbene complexes readily eliminate HF under the reaction conditions forming a difluoromethanimine moiety, which is further attacked by the nucleophile. The isolated products are carbene complexes of the type (CO)5Cr[C(NR2]N=C(NR2)F] (3a‐c), (CO)5Cr[C(NR2)N=C(NR2)2](3d), (CO)5Cr[CN(CH3)N(CH)3C{N(CH3)H}=N] (3e), and (CO)5Cr(C(OCH3)N=C(OCH3)2] (3f). The structure of 3c has been determined by an X‐ray crystal structure analysis. Copyright © 1990 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim