Liquid crystalline esters

Details Liquid crystalline esters Liquid crystalline esters

1987-05-20

1989-05-16

Gron, Teddy S.

Compositions

Radioactive compositions

Nuclear reactor fuel

25229901, 25229963, 2522995, 350350R, 558414, 558416, 558426, 560 73, 560 59, 560 65, 560 66, 560102, 560104, 560107, 560108, 560118, 560125, 560126, 560128, 560 1, G02F 113, C09K 1930, C09K 1952, C07C 6976

Patent

active

048304700

ABSTRACT:
Compounds of the formula ##STR1## wherein m represents is the number 0 or 1; A is a single covalent bond, --CH.sub.2 --CH.sub.2 --, --OCH.sub.2 --, --COO-- or --OOC--; rings B, C and D are 1,4-phenylene optionally substituted with cyano, halogen or lower alkyl; Y.sup.1 and Y.sup.2 are hydrogen or one of them also is cyano; and R.sup.1 and R.sup.2 each represents C.sub.1 -C.sub.18 -alkyl or C.sub.2 -C.sub.18 alkenyl, either of which is optionally halogen-substituted, in which one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are optionally replaced by oxygen; with the provisos that at least one of R.sup.1 and R.sup.2 has a chiral carbon atom or a C--C double bond or both when A is --COO-- and at least one of R.sup.1 and R.sup.2 has a C--C double bond when A is a single covalent bond, their preparation, liquid crystalline mixtures containing these compounds and their use for electro-optical purposes are described.

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16th Freiburger Arbeitstagung Flussigkristalle, Mar. 16-21, 1986.

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