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Communication | Special issue | Vol 76, No. 1, 2008, pp.215-219
Published online, 1st May, 2008
DOI: 10.3987/COM-08-S(N)49
One Step Introduction of 4,4-Bis(trifluoroacetyl)-1,3-butadiene System to Aromatic Rings Using Fluorine-Containing 3,4-Dihydro-2H-pyrans. A Facile Synthetic Method for 1,1,1,5,5,5-Hexafluoro-3-[(E)-3-arylallylidene]pentane-2,4-diones

Norio Ota, Etsuji Okada,* Atsushi Sonoda, Nobuyuki Muro, Dai Shibata, and Maurice Médebielle

*Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan

Abstract

New 1,1,1,5,5,5-hexafluoro-3-[(E)-3-arylallylidene]pentane-2,4-diones were synthesized in moderate to high yields by the ring-opening reaction of 1-(2-ethoxy-4-isobutoxy-6-trifluoromethyl-3,4-dihydro-2H-pyran-5-yl)-2,2,2-trifluoroethanone with aromatic compounds in refluxing trifluoroacetic acid.