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• W2023821811 startingPage "2271" @default.
• W2023821811 abstract "In the framework of a project devoted to the chemical transformation of monosaccharides from hemicelluloses into higher added value materials, the zinc-induced reductive elimination from 5-deoxy-5-iodo derivatives of D-xylose and L-arabinose was carried out. This study gave us the opportunity to observe surprising behaviors. In particular, the reaction strongly depends on structural parameters (protecting group pattern, configuration at C-4) and on the presence of Zn2+ ions. Collaterally with the experimental work, water solvent PCM HF-DFT (MPW1K/LANL2DZ) computations were performed to obtain insight into the mechanism for the reductive part of the reaction sequence. Without Zn2+, the zinc insertion reaction was found to proceed through a concerted but non-synchronous process involving a relatively large energy barrier (32 kcal mol-1) that directly leads to the presumed organozinc intermediate. In the presence of Zn2+, a three-step mechanism was identified in which the cation coordinates the anomeric and ring oxygen atoms and also the sugar iodine atom, causing an activating effect on the zinc insertion process by facilitating the homolytic rupture of the C-I bond. Complexes between zinc and Zn2+ bound carbohydrates were characterized with large stabilization energies, suggesting that Zn2+ might enhance the affinity of the organic compound with the zinc metal surface." @default.
• W2023821811 created "2016-06-24" @default.
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• W2023821811 date "2007-03-01" @default.
• W2023821811 modified "2023-10-18" @default.
• W2023821811 title "Compared Behavior of 5-Deoxy-5-iodo-d-xylo- andl-Arabinofuranosides in the Reductive Elimination Reaction: A Strong Dependence on Structural Parameters and on the Presence of Zn2+. A Combined Experimental and Theoretical Investigation" @default.
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• W2023821811 doi "https://doi.org/10.1021/jo0614590" @default.
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