Complete assignment of the aliphatic chains in dimers, trimers and polymer of 3‐hexylthiophene through 2D‐NMR spectroscopy

Abstract The 1 H and 13 C signals of the hexyl chains of the title compounds were fully assigned. The regiochemical features of the aliphatic region of proton and carbon spectra were analysed in dimers and trimers. Dimers and trimers proved to be reliable model compounds in the regiochemical assignment of poly(3‐hexylthiophene) even when the aliphatic region of proton and carbon spectra was involved. The chemical shifts of the protons of CH 2 (α)s and of the hexyl chain as a whole and those of the first three aliphatic carbons appear to be the most significant.