Organic thermotropic nematic compounds

Details Organic thermotropic nematic compounds Organic thermotropic nematic compounds

1975-09-02

1977-08-09

Schwartz, Gerald A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252299, 350160LC, C07D11900

Patent

active

RE0293490

ABSTRACT:
A new family of organic thermotropic nematic compounds comprising N-(para-substituted alkoxy-benzylidene)-anilines having also a para-n-butyl substituent on the aniline ring. These compounds have the following structural formula: ##STR1## wherein R is a straight chain alkyl group containing 1 to 4 carbon atoms and R' is n-butyl. Synthesis involves combining the desired p-substituted benzaldehyde and p-n-butyl aniline in equimolar proportions in anhydrous ethyl alcohol with glacial acetic acid as catalyst. The resulting homologous series of compounds are useful as materials which undergo a change in optical properties under the influence of externally applied energy, preferred members of which, either individually or in binary mixtures, have melting points near room temperature, a broad nematic mesomorphic temperature range within an overall range of about 0.degree. to about 70.degree. C., low viscosity in the nematic phase, good stability, and substantially no color.

REFERENCES:
patent: 3829491 (1974-08-01), Strebel
Chemical Abstracts, vol. 69, col. 43,200(g), 1968.
Gabler: Inaugral - Dissertation, Leipzig Germany (1939).
Weygond, Z. Phys. Chem., vol. 53, pp. 75-77 (1942).
Dove et al., J. Chem. Soc., pp. 4616-4617 (1954).

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