Asahi Glass Company, Limited

Seimi Chemical Co., Ltd.

Osamu Yokokouji

Hidemasa Koh

Katsutoshi Machida

Takashi Miyajima

Seiji Shinya

Seisaku Kumai

Takeshi Koike

Tamon Tachibana

Kanetaka Shimizu

Masaki Oiwa

It is to provide a liquid crystal composition containing at least one type of optically active compounds of the following formulae (1) to (4), and a liquid crystal electro-optical element excellent in display quality. In each formula, C* is asymmetric carbon, and the respective symbols are as defined in descriptionR-A-C*HX&#x2014;Y-A-(Z-A)-C&#x2261;C-A-(Z-A)-R&#x2003;&#x2003;(1)R-A-C*HX&#x2014;Y-A-Z-A-Z-A-R&#x2003;&#x2003;(2)R-Pn-C*HX&#x2014;CH-A-Y-A-R&#x2003;&#x2003;(3) 

Liquid crystal composition containing an optically active compound and liquid crystal electro-optical element

A difluoroethylene compound of the following formula (1) having a liquid crystal property is provided:

Difluoroethylene compounds and liquid crystal compositions containing

A difluoroethylene compound of the following formula (1) is provided:

A difluoroethylene compound of the following formula (1):

A process for producing nucleus-fluorinated aromatic carboxylates, which comprise nucleus-fluorinating aromatic carboxylates of the following formula (1) with a fluorinating agent to obtain nucleus-fluorinated aromatic carboxylates of the following formula (2): ##STR1## wherein R.sup.1 is an alkyl group, an aryl group or a fluoroalkyl group, each of A and B is at least one member selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group, an aryl group and a fluoroalkyl group, and n and m are integers satisfying m+n=6, provided that m is 1 or 2, provided that at least one A is an activated chlorine or bromine atom, and B corresponding to such an activated chlorine or bromine atom is a fluorine atom.

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Yokohama, Japan

Osamu Yokokouji