| Popis: |
Reactions between ω-hydroxyalk-1-ynes, HC2(CH2)nOH (n = 2 or 3) or HC2CH2CHMeOH, and MX(PR3)2(η-C5H5) (M = Ru, X = Cl, R = Me or Ph; M = Os, X = Br, R = Ph) in the presence of NH4PF6 give cationic cyclic carbene complexes, presumably by rapid intramolecular cyclization of (undetected) intermediate ω-hydroxyvinylidene complexes. Further reactions of {Ru[C(CH2)3O]-(PPh3)2(η-C5H5)}+ include (a) base-catalysed H- D exchange of both H atoms of the β-CH2 group; (b) metallation and subsequent dimethylation of the β-CH2 group; (c) reduction by NaAlH2- (OCH2CH2OMe)2 to Ru[CH(CH2)3O](PPh3)2(η-C5H5). |
