The Synthesis and Transition Temperatures of Some Lateral Cyano-Substituted-1,1′:4′,1″-terphenyls

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Abstract
In recent years we have used palladium-catalysed cross-coupling procedures to prepare a large number of very interesting lateral mono- and di-fluoro-substituted terphenyls. Similar methodology has been applied in the synthesis of lateral cyano-substituted terphenyls to assess the extent to which the me-sophases of such systems can tolerate the larger cyano group; the synthetic routes to these compounds are discussed in detail. The compounds with the lateral cyano-substituent in the centre ring have very low melting points and the liquid crystal phases exhibited (Sc, SA and nematic) are dependent on the terminal substituents. The compounds with the cyano-substituent at the edge of the terphenyl core are still quite low melting and they have very wide SA ranges.

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