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Oligophenyls, Oligophenylenes, and Polyphenyls, a Class of Thermally Very Stable Compounds
Author(s) -
Ried W.,
Freitag D.
Publication year - 1968
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.196808351
Subject(s) - melting point , condensation , solubility , degree (music) , chemistry , materials science , thermodynamics , organic chemistry , physics , acoustics
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.