ISSN:
1573-8353
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The functionalized complexes [(dppe)Cp*Fe(C≡C)]2-(Py) (Py=2,6-C5H3N and 3,5-C5H3N (dppe=1,2-bis(diphenylphosphino)ethane) were isolated in good yields from reaction of the chloro complex (dppe)Cp*FeCl with the protected bis-acetylenic heterocyclic precursor. These electron-rich pyridyl ligands constitute interesting examples of organometallic heterocycles bearing redox-active substituents. Attempts to find an alternative route starting from the alkynyl complex [(dppe)Cp*Fe(C≡CH)] and the corresponding dibromopyridines using a Sonogashira cross-coupling reaction are also described. By this route, the monofunctionalized products [(dppe)Cp*Fe(C≡C)]-2,6-Py-Br and [(dppe)Cp*Fe(C≡C)]-3,5-Py-Br could be cleanly isolated. These compounds open the way to the generation of heteroaromatics featuring nonequivalent alkyne substituents such as [(dppe)Cp*Fe(C≡C)]-2,6-Py-[(C≡C)SiMe3] or [(dppe)Cp*Fe(C≡C)]-3,5-Py-[(C≡C)SiMe3] by further coupling.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02251798
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