The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 1996
Filed:
Jan. 12, 1995
Hoffmann-La Roche Inc., Nutley, NJ (US);
Abstract
Optically active compounds of the formula ##STR1## wherein n stands for the number 0 or 1; Z.sup.1 is a single covalent bond or --CH.sub.2 CH.sub.2 --; Z.sup.2 is a single covalent bond, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --COO-- or --OOC--; rings A.sup.1 and A.sup.2 each independently represent trans-1,4-cyclohexylene or optionally halogen-, cyano- and/or methyl-substituted 1,4-phenylene in which optionally 1 CH group or 2 CH groups is/are replaced by nitrogen; R.sup.2 is a group R.sup.4 or a group of the formula ##STR2## R.sup.4 is cyano, halogen, --OCY.sup.1 F.sub.2, --CY.sup.1 F.sub.2 or an alkyl group in which optionally one >CH--CH< is replaced by >C.dbd.C< and/or optionally one methylene group or two non-adjacent methylene groups is/are replaced by --O--, --COO-- and/or --OOC-- and/or optionally one methylene group is replaced by --CHY.sup.2 --; Y.sup.1 is hydrogen or fluorine; Y.sup.2 is halogen, cyano or methyl; R.sup.1 and R.sup.3 denote alkyl in which optionally one >CH--CH< is replaced by >C.dbd.C< and/or optionally one methylene group or two non-adjacent methylene groups is/are replaced by --O-- and/or optionally one or more hydrogen atoms is/are replaced by fluorine; and (S*) and (R*) denote the relative configurations of the chiral carbon atoms, as well as liquid crystalline mixtures which contain such compounds and their use for optical and electro-optic purposes.