Liquid crystal substances

Details Liquid crystal substances Liquid crystal substances

1981-09-14

1984-03-20

Gron, Teddy S.

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

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

260463, 260465D, 25229961, 25229962, 25229963, 560 59, 560 61, 560 73, 560118, 560119, 544316, 544318, 544334, 544335, 544383, 544392, 544394, 544395, C07C 69753, C07D23926, C07D23928, C09K 334

Patent

active

044382685

ABSTRACT:
This invention relates to new nematic liquid crystal substances for electro-optical components.
The object of this invention is to create substances for electro-optical components combining chemical and thermal stability with low melting and high clear points at low operational voltage, as well as to processes for their production.
It has been found that new liquid-crystal trans-6-n-alkyl-decalin-2-carbonic acid ester of the general formula ##STR1## can be introduced into electro-optical components. These substances are produced by the catalytic high-pressure hydrogenation of 6-n-alkylnaphthalene-2-carbonic acids, separation of the trans-isomers by distillation, and esterification with the corresponding hydroxy compounds of the acyl chlorides obtained through reaction with thionyl chloride.

REFERENCES:
patent: T901017 (1972-08-01), Hamb et al.
patent: 3594436 (1971-07-01), Hedge et al.
patent: 4119558 (1978-10-01), Coates et al.
patent: 4340498 (1982-07-01), Sugimori
Lauk, U., et al., Helvetica Chimica Acta, vol. 64, FASC 6, No. 176, pp. 1847-1848, (1981).
Coates, D., et al., Mol. Cryst. Liq. Cryst., vol. 37, pp. 249-262, (1976).
Coates, D., et al., Mol. Cryst. Liq. Cryst., vol. 41, (Letters), pp. 119-124, (1978).

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