A new type of unsaturated phosphonates 5 were synthesized by the Wittig-Homer reactions of bisphosphonylmethane 4 with 5-aryl-2(E),4(E)-pentadienal and 5-aryl-3-methyl-2(E), 4(E)-pentadienal. The structures of all new compounds prepared were characterized by 'H NMR, 31P NMR, 13C NMR, IR spectra, MS and elemental analyses, one of them was determined by X-ray diffraction analysis.
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