Facile synthesis of a series of liquid crystalline...

Details Facile synthesis of a series of liquid crystalline... Facile synthesis of a series of liquid crystalline...

2006-12-13

2008-12-16

Wu, Shean C (Department: 1795)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C252S299610

Reexamination Certificate

active

07465802

ABSTRACT:
The invention relates to a facile synthesis of a series of 2-(4′-alkylphenyl)-5-cyanopyridine liquid crystal compounds which are represented by the following formula (I):wherein Cnis a linear alkyl having 1-12 carbon atoms. The synthesis of the liquid crystalline 2-(4′-alkylphenyl)-5-cyanopyridine is completed in a two-step reaction. First, a Grignard reagent (such as 4-alkylphenylmagnesium bromide) is added to a 3-cyanopyridinium salt (such as N-phenyloxycarbonyl-3-cyanopyridinium chloride) to get a 1,2-dihydropyridine. Then the 1,2-dihydropyridine is oxidized with o-chloronil to obtain the 2-(4′-alkylphenyl)-5-cyanopyridine.

REFERENCES:
patent: 4684477 (1987-08-01), Sugimori et al.
patent: 374849 (1990-06-01), None
patent: H04-213386 (1992-08-01), None
patent: 05112530 (1993-05-01), None
Win-Long Chia and Ru-Sung Lu, Novel synthesis and mesophase studies on a series of 2-(4-alkylphenyl)-5-cyanopyridine, Dec. 14, 2005, 1-68, Fu Jen Catholic University, Taiwan.

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