Nitrogen heterocycles and liquid crystalline mixtures containing them
AssigneeHoffmann-La Roche Inc.
InventorsRichard Buchecker, Stephen Kelly, Martin Schadt
Life of this patent
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Abstract
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.
Claims5
A compound of the formula ##STR7## 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 and 6 inclusive;
- r is either 0 or 1 provided that the sum of q and r is at least 3,
- s is either 0 or 1;
- p is either 1 or 2, provided that n is zero when p is 2.
A liquid crystalline mixture comprising at least two components, wherein at least one component is a compound of the formula ##STR10## 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 of 2 to 6 inclusive;
- r is either 0 or 1 provided that the sum of q and r is 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.
Dependencies are inferred from the claim text.