Chromium-carbon multiple bonds: aminocarbyne complexes of chromium bearing isocyanide ligands
| Autor: | Alexander Constantin Filippou, Christian Mehnert, Matthias Kleine, Klaus M.A. Wanninger |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Stereochemistry
Organic Chemistry Decarbonylation Cationic polymerization chemistry.chemical_element Biochemistry Toluene Medicinal chemistry Inorganic Chemistry chemistry.chemical_compound Chromium chemistry Yield (chemistry) Materials Chemistry Physical and Theoretical Chemistry Carbon Tetrahydrofuran Derivative (chemistry) |
| Zdroj: | Journal of Organometallic Chemistry. 491:47-55 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/0022-328x(94)05208-s |
| Popis: | 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'). |
| Databáze: | OpenAIRE |
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