W. Cao, Zhijian Shi, Chun Fan
Aug 26, 2010
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Journal
Chinese Journal of Chemistry
Abstract
The acyclic precursors. methyl 3-perfluoroallkyl-4-carbethoxy-5-methoxy-6-(trihenylphosphoranylidene)hexa-2.4-dienoates (4) were obtained via the addition reaction of ethyl 3-methoxy-4-(triphenylphosphoranylidene)but-2-enoate (2) with equally molar methyl 2-perfluoroalkynoates (3). Ethyl 2,4-dimethoxy-6-perfluoroalkylbenzoates (5) were synthesized in high yield via an intramolecular elimination of Ph3PO of 4 by heating in anhydrous benzene in a sealed tube. The structure of these compounds was confirmed by IR, 1H, 13C, 2D C-H cosy NMR and mass spectra and elemental analyses. The possible reaction mechanisms were also proposed.