Abstract
A new conjugated oligomer was synthesized by reacting diphenyldiacetylene under high pressure of 0.03-0.13 GPa at 250°C for 5 h. The oligomer was obtained from reacted diphenyldiacetylene in liquid state and of a molecular weight M n of 1200-1270 in polystyrene calibration. The fraction of the oligomer increased with increasing pressure. Visible absorption and IR spectra, field desorption mass (FDMS) spectrum, thin-layer chromatography, and 13 C NMR results indicate that the oligomer had a cyclic structure by the FDMS spectrum. The 13 C NMR spectrum for the oligomer corresponded to the polyacene-based structure. It was proposed that high-pressure oligomerization of diacetylene is a powerful method to produce a cyclic oligomer
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