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During a recent investigation of the photophysical properties of Ru(II) complexes containing the ligand 4,4′-bipyridine we had occasion to prepare an intermediate, 1,4-bisethoxymethylene-2,3-butadione, abbreviated as EMB. We were surprised to find a strong band at ca. 1590cm −1 (IR spectra) which had all the characteristics of a carbonyl stretch but saw no comparable bands in the region where...