# US 4,391,754 A · Anthraquinone compounds

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- Number: US 4,391,754 A
- Document ID: US4391754A
- Status: Granted
- Kind: A
- Application number: 06/363,223
- Filed: 1982-03-29
- Granted: 1983-07-05
- Earliest claimed: 1980-07-29
- Assignees: Imperial Chemical Industries PLC
- Inventors: Andrew H. M. Renfrew
- Web page: https://patentgrep.com/patent/US4391754A

## CPC

- C09K 19/603: {Anthroquinonic}
- C09B 1/02: Hydroxy-anthraquinones; Ethers or esters thereof {(C09B1/007 takes precedence)}
- C09B 1/503: unsubstituted amino-hydroxy anthraquinone
- C09B 1/515: N-alkyl, N-aralkyl or N-cycloalkyl derivatives
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)

## Abstract

Compounds of the formula: ##STR1## wherein R.sup.1 is alkyl or aryl; X is H, NH.sub.2 or NHCH.sub.3 ; one of Y and Z is OH and the other is H, NH.sub.2 or NHCH.sub.3 ; and one of R.sup.2 and R.sup.3 is H and the one that is ortho to the OH group is a --CH.sub.2 R.sup.1 radical. The compounds include pleochroic dyes useful in liquid crystal display systems.

## Claims

### Claim 1

An anthraquinone compound of the formula: ##STR7## wherein R.sup.1 represents an alkyl radical containing from 1 to 20 carbon atoms;
X is H, NH.sub.2 or NHCH.sub.3 ;
one of Y and Z is OH and the other is H, NH.sub.2 or NHCH.sub.3 ; and
one of R.sup.2 and R.sup.3 is H and the one that is ortho to the OH group is a --CH.sub.2 R.sup.1 radical.

### Claim 2 (depends on 1)

An anthraquinone compound as claimed in claim 1 having the formula: ##STR8## wherein R.sup.1 is an alkyl radical containing from 2 to 9 carbon atoms and one of Y.sup.2 and Z.sup.2 is OH and the other is NH.sub.2.

### Claim 3 (depends on 2)

An anthraquinone compound as claimed in claim 2 having the formula: ##STR9##

### Claim 4 (depends on 2)

An anthraquinone compound as claimed in claim 2 having the formula: ##STR10##