Journal
TETRAHEDRON
Volume 62, Issue 2-3, Pages 401-409Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2005.09.075
Keywords
hypervalent compounds; Lewis acid; phosphorus; organocatalyst; Diels-Alder reaction
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Phosphonium salts as a novel metal-free Lewis acid catalyst can be considered as organocatalysts. The introduction of a five-membered dioxaphosphacycle to the phosphonium salt is critical to its function as a Lewis acid catalyst for the Diels-Alder reaction. The key to the successful catalysis by the phosphonium salt is the utilization of hypervalent bonding as a strategic interaction for the generation of an active species. (c) 2005 Elsevier Ltd. All rights reserved.
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