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- W2037200064 abstract "Abstract Tricarbonyliron complex 3 is prepared by the reaction of a strongly homo-conjugated nonparallel 1,4-diene, tricyclo[5.3.1.0 4,9 ]undeca-2,5-diene ( 2 ), with Fe(CO) 5 or Fe 2 (CO) 9 . Upon complexation a much larger shielding effect (Δδ = 111.8 ppm) of the inner carbons (C3 and C5) than that (Δδ = 73.5 ppm) of the outer ones (C2 and C6) is observed in 13 C NMR of 3 . The chemical shift value of the carbonyl carbons (216.3 ppm) is intermediate between those of tricarbonyliron complexes of norbornadiene ( 1 ) and 1,3-cyclohexadiene. An X-ray crystallographic analysis of 3 reveals that the iron atom is located at almost equal distances from the four olefinic carbons and that the geometry of the iron atom retains a square pyramidal coordination. It also shows that the bond lengths of C3C4 and C4C5 are relatively short (1.504 and 1.508 A, respectively) and that the bond angle of C3C4C5 is small (95.1°). Furthermore, the olefinic bonds of 3 are markedly distorted. These results suggest a little contribution of the terminal bonding nature 5 to the overall bonding nature of 3 . Reaction of 3 with aluminum trichloride affords the ring expanded dienone 6 by a carbonyl insertion, showing similarity with that of tricarbonyl(1,3-cyclohexadiene)iron." @default.
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- W2037200064 date "1991-11-01" @default.
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- W2037200064 title "Preparation, structure, and reaction of the tricarbonyliron complex of tricyclo[5.3.1.04,9]undeca-2,5-diene, a strongly homo-conjugated nonparallel 1,4-diene" @default.
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- W2037200064 doi "https://doi.org/10.1016/0022-328x(91)86174-o" @default.
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