| 摘要 |
PROBLEM TO BE SOLVED: To obtain a new tricyclic phenylpyridine derivative which is useful as a component for practically excellent liquid crystals responding at high speeds in wide temperature ranges, has alkyl side chains not having oxygen functional groups, and contains a pyridine ring. SOLUTION: A tricyclic phenylpyridine derivative of formula I (R1 is a 1-12C alkyl; R2 is a 1-12C alkyl or H; ring A and ring B are each 1,4-phenylene, pyridin-2,5-diyl, provided that the ring B is 1,4-phenylene, when the ring A is pyridin-2,5-diyl). For example, 2-(4decylphenyl)-5-(4-octylphenyl)pyridine. The compound of formula I is obtained, for example, by reacting an alkylbromobenzene of formula II with buthyllithium or the like to form the lithio compound, reacting the lithio compound with trimethyl borate, reacting the obtained borate derivative with 2,5-dibromopyridine in the presence of a palladium catalyst, and then reacting the obtained bromophenylpyridine derivative with a Grignard reagent in the presence of a nickel catalyst.
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