Preparation and 13 C NMR spectra of model compounds for poly(4‐bromostyrene)

The preparations of 2,4‐bis(4‐bromophenyl)pentane ( 1b ) and 2,4,6‐tris(4‐bromophenyl)heptane ( 2b ) are described. The study of the different isomers of 1b and 2b by 13 C NMR allows a comparison of the various configurational sequences of these compounds in terms of their chemical shifts. Methyl, methylene, and aromatic C 1 carbons of 1b and 2b could be deduced from the values obtained from corresponding polystyrene model compounds by a mere translation. From the aromatic C 1 chemical shifts it was possible to propose an assignment of the corresponding triads of poly(4‐bromostyrene).