The first carbonyl iron complexes with dihydroacepentalene ligands
1986; Elsevier BV; Volume: 42; Issue: 6 Linguagem: Inglês
10.1016/s0040-4020(01)87589-x
ISSN1464-5416
AutoresHolger Butenschön, Armin de Meijere,
Tópico(s)Magnetism in coordination complexes
Resumo1,4-Dibromo- (8) as well as 1,4,7-trichloro- (11a) and 1,4,7-tribromotriquinacene (11b) react with Fe2(CO)9 in THF to yield (dihydroacepentalene)hexacarbonyldiiron complexes 9 and 10, the first representatives with a 7,10-dihydroacepentalene ligand. By reaction with Fe2(CO)9, the readily accessible 4,7-bis (dialkylamino)tricyclo[5.2.1.04.10]deca-1(10),2,5,8-tetraenes 14, derivatives of the unknown 4,7-dihydroacepentalene, were transfomed into their tricarbonyliron complexes 15. Upon reduction with sodium in THF, the η4-(diene)tricarbonyliron 15 selectively gave the novel 1,10η2-(olefin)tricarbonylferrates(-2)17 as a result of a twofold electron transfer. The intermediate green radical anion 16, which is persistent in the absence of excess sodium, was characterized by its ESR signal. Complexes 17 are the first of their class with complete structural characterization by 1H- and 13C-NMR spectroscopy.
Referência(s)