Patent ID: 7910018

Claim:
A compound of Formula (I) wherein R 1 and R 2 are independently selected from cyano, halo, optionally substituted hydrocarbyl, optionally substituted alkoxy, optionally substituted heterocyclyl, a group R 13 C(O)O— or R 13 OC(O)— where R 13 is optionally substituted hydrocarbyl; R 3 , R 4 and R 5 are independently selected from hydrogen, halogen, CF 3 or SF 5 ; X 1 , X 2 , X 3 and X 4 are independently selected from a direct bond, —CH 2 CH 2 —, —(CH 2 ) 4 —, —CH 2 O—, —CH═CH—, —C≡C—, —COO—, —OCO—, or —OCH 2 —; and A, B, C and D are independently selected from a 1,4-phenylene, 1,4-cyclohexyl or a heterocyclic ring, any of which may be optionally substituted provided that at least one of rings C or D must be present; and n is 0 or 1, m is 0 or 1, p is 0 or 1 and k is 0 or 1, provided that k+m+n+p is greater than 0, further provided that if k is 0 then n is 0, and also provided that if m is 0 then p is 0.