Nitrogen heterocycles and liquid crystalline mixtures containing them
申请人:Hoffmann-La Roche Inc.
公开号:US05326497A1
公开(公告)日:1994-07-05
Compounds of the general formula ##STR1## wherein R.sup.1 is C.sub.5-12 -alkyl or C.sub.5-12 -alkenyl; R.sup.2 is C.sub.1-9 -alkyl or C.sub.2-9 -alkenyl; provided that at least one of groups R.sup.1 and R.sup.2 is alkenyl; X is a CH group or nitrogen; n is either 0 or 1; q is a whole number between 2 to 6 inclusive; r is either 0 or 1 provided that the sum of q and r at least 3, s is either 0 or 1; and p is either 1 or 2, provided that n is zero when p is 2; mixtures which contain these compounds as well as the use of these compounds for electro-optical purposes.