Chiral substituted tartarimides

US4996330A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gunter Scherowsky · Berlin, DE
• Peter Schreiber · Jena, DE

Key dates

• Filing date: Jun 28, 1989
• Grant date: Feb 26, 1991
• Expiry date: Jun 28, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/588
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Chiral substituted tartarimides, a process for their preparation and their use as doping agents in liquid-crystal mixtures. The new chiral N-substituted tartarimides which are esterified on both of the OH groups (pyrrolidinediones) are characterized by the general formula (I) ##STR1## in which the symbols have the following meaning: R.sup.2 denotes linear or branched (C.sub.1 -C.sub.16)-alkyl, it being possible for one or two non-adjacent CH.sub.2 groups to be replaced by O or S, or, if n1=1, also denotes F, Cl, Br or CN, PA1 A.sup.1 and A.sup.2 independently of one another denote 1,4-phenylene, diazine-2,5-diyl, diazine-3,6-diyl, 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 1,3-dithiane-2,5-diyl or 1,4-bicyclo(2,2,2)octylene, it being also possible for these groups to be at least monosubstituted by F, Cl, Br, CN and/or (C.sub.1 -C.sub.12)-alkyl (if appropriate one or two non-adjacent CH.sub.2 groups are replaced by O atoms), PA1 denotes CO--O, O--CO, CH.sub.2 --CH.sub.2, OCH.sub.2, CH.sub.2 O, CH.dbd.N, N.dbd.CH or N.dbd.N, PA1 n1 and n3 independently of one another denote zero, 1 or 2, n1 and n3 not being zero at the same time, PA1 n2 denotes zero or 1, n1+n2+n3 being not more than 4…