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Synthese eines 2 H ‐Inden‐2‐on‐Dianion‐Komplexes durch Reduktion eines metallgebundenen Dicarbens
Author(s) -
Öfele Karl,
Dyckhoff Florian,
Krist Herbert G.
Publication year - 1993
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19931261203
Subject(s) - chemistry , cyclic voltammetry , acetonitrile , chromium , ligand (biochemistry) , medicinal chemistry , metal , chelation , electron transfer , stereochemistry , nuclear magnetic resonance spectroscopy , polymer chemistry , crystallography , inorganic chemistry , photochemistry , organic chemistry , electrochemistry , biochemistry , receptor , electrode
Synthesis of a 2 H ‐Inden‐2‐one Complex by Reduction of a Metal‐Bound Dicarbene Herrn Professor Dr. Dr. h. c. mult. E. O. Fischer zum 75. Geburtstag gewidmet. Tetracarbonylchromium complexes with chelating o ‐phenylene‐biscarbene ligands are reduced in two steps as shown by cyclic voltammetry. The first step corresponds to a reversible one‐electron transfer, the second to an irreversible one‐electron reduction followed by a rapid rearrangement of the biscarbene ligand into an η 5 ‐bound 2 H ‐inden‐2‐one system by a twofold C–C coupling with one CO ligand. By reaction of tetracarbonyl[ o ‐phenylenebis(methoxymethylene)]chromium ( 4 ) with sodium amalgam in acetonitrile the diamagnetic tricarbonyl(η 5 ‐1,3‐dimethoxy‐2‐indenone)chromium dianion [ 6 ] 2– is formed as the final reduction product. Its structure was determined by NMR and IR spectroscopy.