Optically active benzene derivatives, process for producing the same and liquid-crystalline substances containing said derivatives as active ingredient and optical switching elements

U.S. Patent Number: 5338484

Abstract: Disclosed are novel active benzene derivatives represented by the general formula (I): ##STR1## (wherein X represents --COO--, --OCO--, --CH.sub.2 O-- or --OCH.sub.2 --; A represents a hydrogen atom, a halogen atom or an alkyl or alkoxyl group having 1 to 20 carbon atoms: R represents an alkyl group having 1 to 20 carbon atoms; l and m each represents a number of 1 or 2, n represents a number of 0 or 1, but when n is 0 the sum of l and m is 3 or less; and * indicates asymmetric carbon atom), a process for producing the same, liquid-crystalline substances containing said derivatives as active ingredient, and optical switching elements utilizing the liquid crystal compositions containing said liquid-crystalline substances.

Inventors: Higashii; Takayuki (Kishiwada, JP), Minai; Masayoshi (Moriyama, JP)

Assignee: Sumitomo Chemical Company, Limited (Osaka, JP)

Application Number: 08/136,827

Issued: 1994-08-16

Expired: 2006-08-16

Classes: 252/299.65 ; 252/299.66; 252/299.67; 560/108; 560/109; 560/141; 560/59; 560/66; 560/73; 568/631

Field of search: 252/299.01,299.64,299.65,299.66,299.67 560/59,66,73,108,109,141 568/631

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