ISSN:
0009-2940
Schlagwort(e):
Sesquifulvalene
;
Heterobimetallic complexes
;
Manganese
;
Chromium
;
Stille coupling
;
Chemistry
;
Inorganic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The synthesis of the heterobimetallic sesquifulvalene complex [(OC)3Mn(μ-η5:η7-C5H4-C7H6)Cr(CO)3]BF4 (2) is reported. [(2,4,6-Cycloheptatrien-1-yl)-η5-cyclopentadienyl]tricarbonylmanganese (3) reacts with (CH3CN)3Cr(CO)3 to give a mixture of endo- and exo-[(OC)3Mn(μ-η5:η6-C5H4C7H7)Cr(CO)3] (4a, b). Hydride abstraction from this mixture resulted in the formation of 2 in low yield. Alternatively, Stille coupling of 2-trimethylstannyl-1,3,5-cycloheptatriene (5) with (iodocyclopentadienyl)tricarbonylmanganese (6) gave [(1,3,5-cycloheptatrien-2-yl)-η5-cyclopentadienyl]tricarbonylmanganese (7). After treatment of 7 with (CH3CN)3Cr(CO)3, a mixture of two heterobimetallic complexes [(OC)3Mn(μ-η5:η6-C5H4-C7H7)Cr(CO)3] (8a, b) was isolated. In 8a, a bridging (1,3,5-cycloheptatrien-2-yl)cyclopentadienyl ligand was found, while 8b contains a (1,3,5-cycloheptatrien-1-yl)cyclopentadienyl ligand. The mixture 8a, b was converted quantitatively into 2 by reaction with triphenylcarbenium tetrafluoroborate. The X-ray crystal structures of 2, 4a, 4b and 8a are reported.
Zusätzliches Material:
5 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/cber.19971300214
