摘要
The acyclic precursors, methyl 3-perfluoroalkyl-4-carbethoxy-5-methoxy-6-(triphenylphosphoranylidene)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.
The acyclic precursors, methyl 3-perfluoroalkyl-4-carbethoxy-5-methoxy-6-(triphenylphosphoranylidene)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.
基金
Project supported by the National Natural Science Foundation of China (No. 20172037).
