Liquid crystal compound

• US 5,202,054 A
• Filed: 01/28/1991
• Issued: 04/13/1993
• Est. Priority Date: 01/26/1990
• Status: Expired due to Fees

• Current Assignee: Showa Shell Sekiyu Kabushiki Kaisha (Idemitsu Kosan Company Limited)
• Original Assignee: Showa Shell Sekiyu Kabushiki Kaisha (Idemitsu Kosan Company Limited)
• Inventors: Yamakawa, Noriko, Suzuki, Yoshiichi, Mogamiya, Hiroyuki
• Primary Examiner(s): Stoll, Robert L.
• Assistant Examiner(s): WU, SHEAN CHIU
• Application Number:
  US07/646,898
• Time in Patent Office: 806 Days
• Field of Search: 252/299.01, 252/299.61, 252/299.62, 252/299.65, 252/299.66, 544/242, 544/246, 544/335
• US Class Current: 252/299.61
• CPC Class Codes: C07D 239/26 with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
• CPC Class Codes: C09K 19/3463 Pyrimidine with a carbon chain containing at least one asymmetric carbon atom, i.e. optically active pyrimidines

Abstract

A liquid crystal compound represented by formula (I): ##STR1## wherein R₁ represents an alkyl group having from 1 to 18 carbon atoms; R₂ represents an optically active group represented by formula (II), (III) or (IV): ##STR2## wherein R₃ represents a lower halo-alkyl group having from 1 to 2 carbon atoms; X represents --O--, --COO--, --OCO-- or a single bond; Y represents --CH₂ O-- or --COO--; and Z represents --COO-- or --O--, l represents 0 or 1, provided that when l is 0, Y is a single bond; n represents an integer of from 1 to 18; and * indicates an optically active center. The compound exhibits three stable states of molecular orientation.

Claims

1. A liquid crystal compound represented by formula (I):

##STR19## wherein R₁ represents an alkyl group having from 1 to 18 carbon atoms;

R₂ represents an optically active group represented by formula (II), (III) or (IV);

##STR20## wherein R₃ represents a lower halo-alkyl group having from 1 to 2 carbon atoms;

Y represents --COO-- when l is 1, and Y represents --COO-- when l is 1, and Y represents a single bond when l is 0 or 1;

n represents an integer of from 1 to 18; and

* indicates an optically active center.

2. A liquid crystal compound represented by formula (V):

##STR21## wherein R₁ represents an alkyl group having from 1 to 18 carbon atoms;

R₄ represents CF₃ or C₂ F₅ ;

n represents an integer of from 1 to 18; and

* represents an optically active center.

3. A liquid crystal composition which comprises (A) a liquid crystal compound represented by formula (VI) and (B) a liquid crystal compound represented by formula (I):

##STR22## wherein R₁ represents an alkyl group having from 1 to 18 carbon atoms;

R₂ represents an optically active group represented by formula (II), (III) or (IV);

##STR23## wherein R₃ represents a lower halo-alkyl group having from 1 to 2 carbon atoms;

R₅ and R₆ each represents an alkyl group having from 1 to 18 carbon atoms;

Y represents --COO-- when l is 1, and Y represents a single bond when l is 0;

l represents 0 or 1;

n represents an integer of from 1 to 18; and

* indicates an optically active center.