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US 5,334,327 AGranted
Laterally fluorinated 4-cyanophenyl and 4'-cyanobiphenyl benzoates
AssigneeThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and North Ireland
InventorsGeorge W. Gray, David Lacey, Kenneth J. Toyne, Michael Hird, Damien G. McDonnell
Life of this patent
Estimating the term…
Abstract
Novel compounds of formula (I), in which R is R.sup.1, R.sup.1 O or R.sup.1 COO, where R.sup.1 is C.sub.1-12 alkyl, n and m are 0 or 1 provided that (n+m) is 0 or 1, each of a, b, c and d are independently 0 or 1, provided (a+b+c+d) is not zero, but excluding the case where a and b are 0 and m is 0 and one of c or d is 0 are described, being useful constituents of nematic liquid crystal materials.
Claims10
A compound having the formula I:
- ##STR41## in which R is R.sup.1 or R.sup.1 0 wherein R.sup.1 is C.sub.1-12 alkyl, m and n are 0 or 1 provided that (n+m) is 1, each of a, b, c and d are independently 0 or 1, provided (a+b+c+d) is not zero and excluding the cases where a and b are 0 and one of c and d is 0, where n, c and d are 0, m is 1 and (a+b)=1, where n is 0, m is 1, (a+b)=1 and (c+d)=1, and where n is 0, m is 1, (a+b)=0 and (c+d)=2.
Dependencies are inferred from the claim text.