Liquid crystalline 2-substituted-5-(1-alkyl-piperid-4-yl)-1,3-di

Details Liquid crystalline 2-substituted-5-(1-alkyl-piperid-4-yl)-1,3-di Liquid crystalline 2-substituted-5-(1-alkyl-piperid-4-yl)-1,3-di

1985-06-26

1986-07-01

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

2522995, 350350C, 350350S, 546207, 549370, C09K 334, G02F 113, C07D40700, C07D40504

Patent

active

045978921

ABSTRACT:
2-Substituted-5-(1-alkyl-piperid-yl)-1,3-dioxanes of the formula I ##STR1## wherein R= ##STR2## R.sup.1 =--C.sub.n H.sub.2n+1, --OC.sub.n H.sub.2n+1, --OOCC.sub.n H.sub.2n+1, --COC.sub.n H.sub.2n+1, --OOCOC.sub.n H.sub.2n+1, --F, --Cl, --Br, --I, --NO.sub.2, --CN --(CH.sub.2).sub.2 CN, ##STR3## and n=1 to 10, are novel liquid crystalline compounds, which can be produced in high yields by means of reacting 2-(1-alkyl-piperid-4-yl)-propane-1,3-diols with aldehydes in the presence of acid catalysts, such as p-toluenesulfonic acid, mineral acids and Lewis acids. Because of their high thermal and chemical stability, which is also transferred to mixtures, the compounds of the formula I are very well suited for utilization in optoelectronic displays.

REFERENCES:
patent: 4298528 (1981-11-01), Setrofer
patent: 4344856 (1982-08-01), Demus et al.
patent: 4349452 (1982-09-01), Osman et al.
patent: 4486332 (1984-12-01), Demus et al.
patent: 4537698 (1985-08-01), Sucrow et al.
Karamysheva, L. A., et al., Advances in Liq. Cryst. Res. and Appl., vol. 2, Bata, Lajos, Ed., Pergamon Press, London, pp. 997-1002 (1981).

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