US 5,310,499 A · Oxazolidinone derivatives, and the use thereof as dopes in liquid-crystal mixtures

Abstract

Chiral oxazolidinones of the formula (I) or (II) ##STR1## in which R.sup.1 is, for example, a straight-chain or branched alkyl radical having 1 to 16 carbon atoms or R.sup.2 and R.sup.3 are, for example, --H, --CH.sub.3 or phenyl, j, 1 and n are zero, 1 or 2, k and m are zero or 1, A.sup.1, A.sup.2 and A.sup.3 are, for example, phenyl or cyclohexyl, M.sup.1 and M.sup.2 are, for example, COO or CH.sub.2 O, and X is, for example, CH.sub.2 or COO, are suitable as dopes in liquid-crystal mixtures. They result in liquid-crystalline ferroelectric phases having short response times. A further advantage is that the oxazolidinones induce a helix of very low pitch, so that they are also suitable for helix compensation in LC mixtures.

Claims5

Dependent claims

A chiral oxazolidinone of the formula (I) or (II) ##STR30## in which * is a chiral center,

(*) is an optional chiral center,
R.sup.1 is a straight-chain alkyl radical having 1 to 16 carbon atoms, it being possible for one --CH.sub.2 --groups to be replaced by --O--,
--R.sup.2 and --R.sup.3, independently of one another, are --H, alkyl having 1 to 12 carbon atoms, or are -phenyl,
j and l are zero, 1 or 2,
k and m are zero or 1, and
n is zero, 1 or 2,
with the proviso that k is zero if j and/or 1 are zero;
m is zero if n is zero;
the sum of j+l+n is at least 1 and at most 3,
--A.sup.1 and --A.sup.2 are ##STR31## --A.sup.3 is ##STR32## --M.sup.1 and --M.sup.2 are --CO--O or --O--CO, and --X--is --O--CH.sub.2 or --CH.sub.2 --.

7 more elements

Dependencies are inferred from the claim text.

Oxazolidinone derivatives, and the use thereof as dopes in liquid-crystal mixtures

Life of this patent

Oxazolidinone derivatives, and the use thereof as dopes in liquid-crystal mixtures

Life of this patent

Abstract

Claims5