The classical and modern syntheses of oligophenyls and polyphenyls are compared to illustrate the value and the range of applications of rhe preparation methods described. sub-stance in this class is p-septiphenyl, which melts at 545 "C. 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 melfing point and at the same time improves the solubility. o-Oligophenyls melt at lower temperatures than the p-isomers. The highest-melting

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Das Thiopyronondioxid (I) wird unter wechselnden Bedingungen zu den Verbindungen (II), (III) bzw. (IVa) + (IVb) halogeniert.

The carbonitriles (I) are used as starting material for the preparation of title compounds of type (III) and (V)/(VII)/(IX), products which may be of interest as pharmacologically active compounds.

Die Benzothiophen‐ dioxide (I) und (III) werden zu der Titelverbindung (II) umgesetzt.