Chromium(VI) Bisimido Dichloro, Bisimido Alkylidene, and Chromium(V) Bisimido Iodo N‐Heterocyclic Carbene Complexes
Year: 2020
Type: article
Abstract: Reaction of CrCl2(N‐tBu)2 with 1,3‐dimethylimidazol‐2‐ylidene (IMe), 1,3‐dimethyl‐4,5‐dichloroimidazol‐2‐ylidene (IMeCl2), 1,3‐di(2‐propyl)imidazol‐2‐ylidene (IPr), 1,3‐dimesitylimidazol‐2‐ylidene (IMes) and 1,3‐bis(2,6‐(2‐Pr)2C6H3)imidazol‐2‐ylidene (IDipp) yields the corresponding N‐heterocyclic carbene (NHC) adducts CrCl2(IMe)(N‐tBu)2 (1), CrCl2(IMeCl2)(N‐tBu)2 (2), CrCl2(IPr)(N‐tBu)2 (3), CrCl2(IMes)(N‐tBu)2 (4) and CrCl2(IDipp)(N‐tBu)2 (5). Likewise, reaction of CrCl2(N‐2,6‐(2‐Pr)2C6H3)2 and CrCl2(N‐adamantyl)2 with IMes yields CrCl2(N‐2,6‐(2‐Pr)2C6H3)2(IMes) (6) and CrCl2(N‐adamantyl)2(IMes) (7), respectively. Reaction of CrCl2(N‐tBu)2 with the bidentate NHCs 1‐R‐3‐(1‐(2‐LiO‐C6H4))imidazol‐2‐ylidene yields the corresponding pentacoordinated Cr(VI) complexes CrCl2(1‐R‐3‐(1‐(2‐O‐C6H4))imidazol‐2‐ylidene)2C6H3)2(IMes) (R = 2,4,6‐(CH3)3C6H2, 8), (R = tBu, 9), (R = 2‐phenyl‐C6H4, 10). Reaction of the chromium(VI) complex Cr(N‐2,6‐(2‐Pr)2‐C6H3)2(CH2C(CH3)3)2 with 1,3‐dimethylimidazol‐2‐ylidene·AgI yields the bimetallic silver adduct of the chromium alkylidene complex (11) along with the tetrahedral chromium(V) complex CrI(N‐2,6‐(2‐Pr)2‐C6H3)2(1,3‐dimethylimidazol‐2‐ylidene) (12). Compounds 1–4, 7, 9–12 were characterized by single‐crystal X‐ray analysis. Finally, the chromium(VI) bisimido‐amido complexes 13–14 bearing the N‐6‐(2‐(diethylboryl)phenyl)pyridyl‐2‐yl‐motif are reported.
Language: English
Subfield: Organic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,500
Funder: Deutsche Forschungsgemeinschaft
OpenAlex ID: W3040673560