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- W2083310823 abstract "High yield syntheses of neutral and cationic aminocarbyne complexes of chromium-bearing isocyanide ligands are reported. Neutral complexes of the type Br(CO)2(RNC)2CrCNiPr2(R = Et(3a); R =tBu (3b)) are obtained from Br(CO)2(pic)2CrCNiPr2 (2) (pic = γ-picoline) by exchange of the γ-picoline ligands with RNC. Complex 3b reacts with tBuNC in toluene at 60°C to give the monocarbonyl derivative Br(CO)(tBuNC)3CrCNiPr2 (4b). Formation of cationic aminocarbyne complexes is favoured in polar solvents as demonstrated by the reaction of 3a or 3b with RNC in refluxing CH2Cl2, which leads exclusively to [(RNC)4(CO)CrCNiPr2]Br (R = Et (5a); R = tBu (5b)). Thermal decarbonylation of 5b with tBuNC in refluxing tetrahydrofuran (THF) affords the cationic aminocarbyne complex [(tBuNC)5CrCNiPr2]Br (7b). Similarly, 3b is converted with TlPF6 and tBuNC to [(tBuNC)3(CO)2CrCNiPr2]PF6 (6b), which reacts with tBuNC in refluxing THF to give [(tBuNC)5CrCNiPr2]PF6 (7bt')." @default.
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- W2083310823 date "1995-04-01" @default.
- W2083310823 modified "2023-09-25" @default.
- W2083310823 title "Chromium-carbon multiple bonds: aminocarbyne complexes of chromium bearing isocyanide ligands" @default.
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- W2083310823 doi "https://doi.org/10.1016/0022-328x(94)05208-s" @default.
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