NMR analysis of a series of 1,2-bis­(1-R-5-oxo-2,3-di­hydro-1H-pyrrol-4-yl­idene)ethanes and X-ray crystal structure analysis of the R = mesityl compound

The structures and chemical properties of a new class of conjugated buta-1,3-dienes were studied by NMR, MS, X-ray analysis and quantum chemical calculations. The compounds can be used as dyes and pigments due to their long-range conjugated systems.