US5114613A
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US
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Lactic acid derivative and liquid crystal composition containing same
Assignee: Canon Inc
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Filing: 1989-09-13
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Granted: 1992-05-19
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Expires: 2009-09-13
Abstract
Abstract An optically active lactic acid derivative represented by the following formula (I): ##STR1## wherein R represents a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 1 to 18 carbon atoms; C* represents an asymmetric carbon atom; l is 0 or 1; m is 1 or 2; A represents a group selected from the following groups (a) and (b): (a) hydroxyl group, halogen, benzyloxy group, phenoxy group, toluenesulfonic acid group, acetyloxy group, trifluoroacetyloxy group; ##STR2## (wherein R' is an alkyl group or alkoxy group having 4 to 18 carbon atoms, n is 0 or 1, ##STR3## with proviso that when A is selected from the groups in the above group (a), l is 1 and m is 1 or 2; and when A is selected from the groups in the above group (b), m=n=1 when l is 0, or m and n are 0, 1 or 2 and m+n is 1 or 2 when l is 1, and ##STR4##
Inventors
- 👤 Kazuo Yoshinaga
- 👤 Kazuharu Katagiri
- 👤 Akira Tsuboyama
- 👤 Hiroyuki Kitayama
- 👤 Kenji Shinjo
- 👤 Chieko Hioki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:14
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/26; C07C; C07C43/00; C07C43/02; C07C43/20; C07C43/23; C07C45/00; C07C45/45; C07C45/46; C07C49/00; C07C49/76; C07C49/84; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021; C09K19/34; C09K19/3441; C09K19/345; C09K19/3458; C09K19/3463
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
An optically active lactic acid derivative represented by the following formula (I): ##STR111## wherein R represents a linear saturated hydrocarbon group having 1 to 18 carbon atoms; C* represents an asymmetric carbon atom; 1 is 0 or 1; m is 1 or 2; A represents a group selected from the following groups (a) and (b): (a) hydroxyl group, halogen, benzyloxy group, phenoxy group, toluenesulfonic acid group, acetyloxy group, trifluoroacetyloxy group; ##STR112## (wherein R' is an alkyl group or alkoxy group having 4 to 18 carbon atoms; n is 0 or 1, ##STR113## with proviso that when A is selected from the groups in the above group (a), 1 is 1 and m is 1 or 2; and when A is selected from the groups in the above group (b), m=n=1 and 1 is 0.
Claim 2
Dependent Claim
134 words
An optically active lactic acid derivative represented by the following formula (I): ##STR111## wherein R represents a linear saturated hydrocarbon group having 1 to 18 carbon atoms; C* represents an asymmetric carbon atom; 1 is 0 or 1; m is 1 or 2; A represents a group selected from the following groups (a) and (b): (a) hydroxyl group, halogen, benzyloxy group, phenoxy group, toluenesulfonic acid group, acetyloxy group, trifluoroacetyloxy group; ##STR112## (wherein R' is an alkyl group or alkoxy group having 4 to 18 carbon atoms; n is 0 or 1, ##STR113## with proviso that when A is selected from the groups in the above group (a), 1 is 1 and m is 1 or 2; and when A is selected from the groups in the above group (b), m=n=1 and 1 is 0.
Claim 3
Dependent Claim
65 words
An optically active lactic acid derivative according to claim 1 represented by the following formula (II): ##STR114## wherein R represents a linear saturated hydrocarbon group having 1 to 18 carbon atoms; C* represents an asymmetric carbon atom; m is 1 or 2; and A 1 represents a substituent selected from hydroxyl group, halogen, benzyloxy group, phenoxy group, toluenesulfonic acid group, acetyloxy group, and trifluoroacetyloxy group.
Claim 4
Dependent Claim
52 words
An optically active lactic acid derivative according to claim 1 represented by the following formula (IV): ##STR115## wherein R represents a linear saturated hydrocarbon group having 1 to 18 carbon atoms; C* represents an asymmetric carbon atom; R' represents an alkyl group or alkoxy group having 4 to 18 carbon atoms; ##STR116##
Claim 5
Dependent Claim
29 words
A lactic acid derivative according to claim 2, wherein, in the formula (II), A 1 is hydroxyl group, R is C 2 H 5 --, and m is 1.
Claim 6
Dependent Claim
29 words
A lactic acid derivative according to claim 2, wherein, in the formula (II), A 1 is hydroxyl group, R is n--C 3 H 7 --, and m is 1.
Claim 7
Dependent Claim
29 words
A lactic acid derivative according to claim 2, wherein, in the formula (II), A 1 is hydroxyl group, R is n--C 5 H 11 --, and m is 1.
Claim 8
Dependent Claim
29 words
A lactic acid derivative according to claim 2, wherein, in the formula (II), A 1 is hydroxyl group, R is n--C 8 H 17 --, and m is 1.
Claim 9
Dependent Claim
29 words
A lactic acid derivative according to claim 2, wherein, in the formula (II), A 1 is hydroxyl group, R is n--C 12 H 25 , and m is 1.
Claim 10
Dependent Claim
29 words
A lactic acid derivative according to claim 2, wherein, in the formula (II), A 1 is hydroxyl group, R is n--C 5 H 11 , and m is 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |