Hydrogenated naphthalenes

Abstract

Compounds of the formula ##STR1## wherein ring A is saturated or aromatic and a saturated ring A which may be present is trans-linked with the second ring; R.sup.1 is a straight-chain alkyl or alkoxy group containing 1 to 11 carbon atoms; R.sup.2 is cyano, a straight-chain alkyl group containing 1 to 11 carbon atoms, an ester group of the formula ##STR2## or, when ring A is saturated, additionally a straight-chain alkoxy group containing 1 to 11 carbon atoms; in the ester group of formula II ring B is either aromatic and X is oxygen or sulfur and R.sup.3 is cyano or a straight-chain alkyl or alkoxy group containing 1 to 10 carbon atoms, or ring B is a trans-1,4-disubstituted cyclohexane ring and X is oxygen and R.sup.3 is cyano or a straight-chain alkyl group containing 1 to 10 carbon atoms; and the total number of carbon atoms in the alkyl and/or alkoxy groups amounts to at most 12, are described. The compounds of formula I are useful in liquid crystal mixtures.

Dependencies are inferred from the claim text.