公开(公告)号：DE3822121A1

公开(公告)日：1990-03-01

申请号：DE3822121

申请日：1988-06-30

Applicant: HOECHST AG

Inventor： SCHEROWSKY GUENTER PROF DR ,  SCHREIBER PETER DIPL CHEM

IPC: C07D207/40 ,  C07D207/416 ,  C09K19/54 ,  C09K19/58 ,  G02F1/137 ,  G02F1/139

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) (I) in which the symbols have the following meaning: R2 denotes linear or branched (C1-C16)-alkyl, it being possible for one or two non-adjacent CH2 groups to be replaced by O or S, or, if n1=1, also denotes F, Cl, Br or CN, A1 and A2 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 (C1-C12)-alkyl (if appropriate one or two non-adjacent CH2 groups are replaced by O atoms), denotes CO-O, O-CO, CH2-CH2, OCH2, CH2O, CH=N, N=CH or N=N, n1 and n3 independently of one another denote zero, 1 or 2, n1 and n3 not being zero at the same time, n2 denotes zero or 1, n1+n2+n3 being not more than 4, and R1 denotes linear or branched (C1-C16)-alkyl or R3-(A1-)n1(B-)n2(A2-)n3, in which R3 is H or R2. These compounds are preferably used as doping agents in twistable liquid-crystal mixtures, in which they effect temperature compensation and twisting.