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- W2034962321 abstract "Abstract A synthetic strategy based on a combination of a sugar electrophile and a transition metal nucleophile allows a metal acyl functionalization at the C-1 carbon atom of acyclic carbohydrates. Following this methodology the per-O-acetylated acyl iron complexes dicarbonylcyclopentadienyl[2,3,4,5,6-penta-O-acetyl-D-galactonyl]iron(II) (6), dicarbonyl cyclopentadienyl[2,3,4,5,6-penta-O-acetyl-D-gluconyl]iron(II) (7), dicarbonylcyclopentadienyl[2,3,4,5-tetra-O-acetyl-L-arabinonyl]iron(II) (8), and dicarbonylcyclopentadienyl-[2,3,4,5-tetra-O-acetyl-D-ribonyl]iron(II) (9) are accessible in high yields. 1H NMR studies indicate that in solution the galacto and arabino (6, 8) complexes adopt planar zigzag conformations, whereas the gluco and ribo (7, 9) analogs prefer non-extended (“sickle”) conformations. A similar conformational preference is observed for the solid state as established by X-ray studies on the galacto and gluco derivatives 6 and 7, underlining the strong impact of syn-1,3-interactions of the protecting groups on the conformation adopted. cPermanent address: Department of Chemistry, University of Jyväskylä P. O. Box 35, Fin-40351 Jyväskylä, Finland 1. Organotransition Metal Modified Sugars, Part 3. - For Part 2, see: K. H. Dotz, 0. Neuß and M. Nieger, Synlert, 1996, 995. Dedicated to Professor Dr. Peter Welzel on the occasion of his 60th birthday Notes cPermanent address: Department of Chemistry, University of Jyväskylä P. O. Box 35, Fin-40351 Jyväskylä, Finland 1. Organotransition Metal Modified Sugars, Part 3. - For Part 2, see: K. H. Dotz, 0. Neuß and M. Nieger, Synlert, 1996, 995. Dedicated to Professor Dr. Peter Welzel on the occasion of his 60th birthday Further details of the crystal structure investigations may be obtained from the Fachiformationszentrum Karlsruhe, D-76344 Eggenstein-Leopoldshafen (FRG) on quoting the depository numbers CSD-406731 (6) and CSD-406732 (7), the names of the authors and the publication" @default.
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- W2034962321 date "1997-12-01" @default.
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- W2034962321 title "Sugar Acyl Iron Complexes: Synthesis and Conformational Studies in Solution and in the Solid State" @default.
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