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:
Nov. 01, 1994
Filed:
Sep. 17, 1992
Richard Buchecker, Zurich, CH;
Stephen Kelly, Mohlin, CH;
Hoffmann-La Roche Inc., Nutley, NJ (US);
Abstract
Optically active compounds of the general formula ##STR1## wherein n stands for the number 0 or 1; R.sup.3 denotes a group R.sup.4 or a group of the general formula ##STR2## A.sup.1, A.sup.2 and A.sup.3 each independently represent 1,4-phenylene, which is unsubstituted or mono- or multiply-substituted with halogen, cyano and/or methyl and in which, where it is unsubstituted, 1 or 2 CH groups is/are optionally replaced by nitrogen, trans-1,4-cyclohexylene, trans-1,3-dioxane-2,5-diyl, bycyclo[2.2.2]octane-1,4-diyl, naphthalene-2,6-diyl, tetralin-2,6-diyl or trans-decalin-2,6-diyl; Z.sup.1 and Z.sup.4 each independently signify a single covalent bond or --CH.sub.2 CH.sub.2 --; Z.sup.2 and Z.sup.3 each independently denote a single covalent bond, --CH.sub.2 CH.sub.2 --, --COO--, --OOC--, --CH.sub.2 O--, --OCH.sub.2 --, --C.tbd.C--, --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 O--, --O(CH.sub.2).sub.3 -- or the trans form of --CH.dbd.CH--CH.sub.2 CH.sub.2 --, --CH.sub.2 CH.sub.2 --CH.dbd.CH--, --CH.dbd.CH--CH.sub.2 O-- or --OCH.sub.2 --CH.dbd.CH--; R.sup.1 and R.sup.5 each independently signify alkyl with 1 to 12 carbon atoms, alkoxymethyl with 2 to 12 carbon atoms, p-alkoxyphenyl or p-alkoxybenzyl; R.sup.2 and R.sup.6 each independently signify hydrogen, alkyl with 1 to 12 carbon atoms or phenyl; R.sup.4 denotes hydrogen, halogen, cyano, trifluoromethyl, trifluoromethoxy or alkyl or alkenyl with 1 to 12 and, respectively, 2 to 12 carbon atoms, which are unsubstituted or mono- or multiply-substituted with halogen, cyano and/or methyl and in which one methylene group or two non-adjacent methylene groups can be replaced by --O--, --COO-- and/or --OOC--; and the oxazoline ring in formula I is present in optically active form, liquid crystalline mixtures which contain such dopants and their use for optical and electro-optical purposes.