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US 4,434,073 AGranted
Perhydrophenanthrene derivatives, their preparation, and their use in liquid-crystalline dielectrics and electro-optical display elements
AssigneeMerck Patent GmbH
InventorsWolfgang Sucrow, Hans-R/u/ diger Murawski, Hermann Minas, Horst Stegemeyer
Life of this patent
Estimating the term…
Abstract
Perhydrophenanthrene derivatives of formula I ##STR1## wherein R.sub.1 is alkyl of 1-10 C atoms and R.sub.2 is alkyl, alkoxy or alkanoyloxy each of 1-10 C atoms, H, Br, Cl or CN, have an extremely low optical anisotropy and are particularly suitable as components of liquid-crystalline dielectrics.
Claims15
A perhydrophenanthrene of the formula ##STR13## wherein R.sub.1 is alkyl of 1-10 C atoms and R.sub.2 is alkyl, alkoxy or alkanoyloxy each of 1-10 C atoms, H, Br, Cl or CN.
Dependencies are inferred from the claim text.