Patent EP0126883A1 successfully refreshed from Google Patents.
EP0126883A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid crystalline cyclohexylbenzene derivatives, their preparation and the liquid crystal compositions containing them
Assignee: Military University of Technology in Warsaw
•
Filing: 1984-03-23
•
Granted: —
•
Expires: 2004-03-23
Abstract
Abstract 4-(trans-4'-n-alkylcyclohexyl)-1-isothiocyanatobenzenes with formula (n integer from 1 to 12) may be prepared starting from the corresponding
Inventors
- 👤 Roman Dabrowski
- 👤 Jerzy Dziaduszek
- 👤 Tomasz Szczucinski
- 👤 Zofia Stolarz
- 👤 Jerzy Zielinski
- 👤 Krystyna Kenig
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 11:52
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3003; C07; C07C; C07C331/00; C07C331/16; C07C331/28; C07C2601/00; C07C2601/12; C07C2601/14; C09K2019/0444
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
16 words
4-(trans-4'-n-alkylcyclohexyl)-1-isothiocyanatobenzenes expressed by the general formula where n is an integer number from 1 to 12.
Claim 2
Dependent Claim
16 words
4-(trans-4'-n-alkylcyclohexyl)-1-isothiocyanatobenzenes expressed by the general formula where n is an integer number from 1 to 12.
Claim 3
Dependent Claim
12 words
4-(trans-4'-n-alkylcyclohexyl)-1-isothiocyanatobenzenes as claimed in claim 1 where n is 3 to 7.
Claim 4
Dependent Claim
58 words
Method of preparation of compounds expressed by formula (I) as defined in claim 1, specific in that 4-(trans-4'-n-alkylcyclohexyl)aniline with the alkyl substituent containing 1 to 12 carbon atoms is dissolved in an organic solvent and treated with an acid chloride in presence of a tertiary amine and/or carbon disulfide, upon which the product is isolated by conventional procedures.
Claim 5
Dependent Claim
13 words
Method as claimed in claim 3 and wherein the acid chloride is thiophosgene.
Claim 6
Dependent Claim
72 words
Method as claimed in claim 3 and wherein the acid chloride is alkyl chloroformate, preferably ethyl chloroformate, and 4-(trans-4'-n-alkylcyclohexyl)aniline (wherein the alkyl group has 1 to 12 carbon atoms) is dissolved in an organic solvent and treated with carbon disulfide in the presence of a tertiary amine, and the isolated product is treated with alkyl chloroformate also in the presence of a tertiary amine; the final product being isolated by conventional procedures.
Claim 7
Dependent Claim
17 words
Liquid crystal composition including at least one component expressed by formula (I) as claimed in claim 1.
Claim 8
Dependent Claim
17 words
Liquid crystal composition as claimed in claim 6 wherein are included 4-(trans-4 1- n-propylcyclohexyl)-1-isothiocyanatobenzene and/or 4-(trans-4'-n-hexylcyclo- hexyl)-1-isothiocyanatobenzene.
Claim 9
Dependent Claim
51 words
Liquid crystal composition as claimed in claim 6 wherein known liquid crystal compounds are included, preferably 4-alkyl-4'-cyanobiphenyls and/or 4-alkoxy-4'-cyanobiphenyls and/or esters of 4-alkylbenzoic acids and/or esters of 4-alkoxybenzoic acids and/or esters of 4-alkylcycloalkanecarboxylic acids and/or 4-(alkylcyclo- hexyl)-cyanobenzenes and/or 1,1'-disubstituted 4-phenyl-2,5-pyrimidines and/or Schiff bases and/or 2,5-disubstituted 1,3-dioxane derivatives and/or optically active compounds.
References Cited (Backward Citations)
EP0000365A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.