Study of the synthesis of oligo-arylenes in the presence of a Friedel-crafts catalyst and an oxidant

1,1‘-Binaphthyl Dimers, Oligomers, and Polymers: Molecular Recognition, Asymmetric Catalysis, and New Materials

“…The resulting materials contained a mixture of 1,1‘-, 1,2‘-, or 2,2‘-binaphthyl units. The binaphthyl composition depended on both the catalyst and oxidant. − These naphthyl polymers generally had a dark color (e.g., dark purple) and high spin density, indicative of polynuclear aromatic structure formation during radical cation polymerization.…”

Thermal transformations of oligoarylenes

“…A decrease of thermal stability in air after attaining a certain molecular weight has also been observed for some other oligoarylene fractions [8]. The observed effects of M n on thermal and thermooxidative stabilities have been confirmed for oligomers of various molecular weights prepared by a special change of synthetic conditions [9]. The respective data for pNB are shown in Fig.…”

“…Experiments were carried out with oligoarylenes based on anthracene (pA) and naphthalene (pN), as well as copolycondensation products of naphthalene and benzene (pNB) prepared in the presence of Friedel-Crafts catalyst and an oxidizing agent such as copper chloride [2,3] and nitrobenzene [4]. The fractionated pA samples were characterized by the Mn value (by measuring the condensation heat effects), IR spectra (UR-20 spectrometer), electronic spectra (SF-14 spectrometer), softening point (from thermomechanical curves), and concentration of paramagnetic centers (PMC) (EPR-2 radiospectrometer).…”