The classical and modern syntheses of oligophenyls and polyphenyls are compared to illustrate the value and the range of applications of the preparation methods described. The investigations showed a relationship between the number, arrangement, and substitution of the aromatic rings and the physical properties of the products. The melting point of the p‐polyphenyls rises with increasing degree of condensation. Methylation, and linkage in the m‐positions lowers the melting point and at the same time improves the solubility. o‐Oligophenyls melt at lower temperatures than the p‐isomers. The highest‐melting substance in this class in p‐septiphenyl, which melts at 545 °C.
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RIED et al. (1968) studied this question.
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