Method for synthesizing fluorine-containing antiform alkyl cyclohexyl biphenyl single liquid crystal
A technology based on biphenyls and liquid crystal monomers, applied in the direction of liquid crystal materials, chemical instruments and methods, preparation of halogenated hydrocarbons, etc., can solve the problems of excessive discharge of three wastes, rising costs, and inability to produce liquid crystals
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[0049] Example, a method for synthesizing fluorine-containing trans-alkylcyclohexylbiphenyl liquid crystal monomers is to select bromobenzene and magnesium for Grignard reaction, then couple with alkylcyclohexanone and hydrolyze, then dehydrate, Synthesis of alkyl cyclohexyl iodobenzene by hydrogenation, transformation and iodination, Grignard reaction between p-fluorobromobenzene and magnesium, then low-temperature coupling to synthesize p-fluorophenylboronic acid, and finally the target compound was synthesized by coupling reaction, which is the synthesis of The route is as follows:
[0050]
[0051]
[0052] Where I is 4-alkyl-1-phenylcyclohexanol, II is 4-alkyl-1-phenylcyclohexene, III is alkylcyclohexylbenzene, IV is trans-alkylcyclohexylbenzene, V is trans-alkylcyclohexyl iodobenzene, VI is p-fluorophenylboronic acid, VII is 4-(4-alkylcyclohexyl)-4',-fluoro-1-1',-biphenyl, R is represented by alkane Base, representing ethyl, propyl, butyl, pentyl respectively; Thi...
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