CF 2 O-bridged, axially substituted cyclohexane derivatives

Details CF 2 O-bridged, axially substituted cyclohexane derivatives CF 2 O-bridged, axially substituted cyclohexane derivatives

2006-04-18

2006-04-18

Wu, Shean C. (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299610, C252S299630, C549S369000, C570S127000, C570S129000, C570S130000, C570S131000

Reexamination Certificate

active

07029730

ABSTRACT:
The invention relates to CF2O-bridged cyclohexane derivatives, in particular compounds of formula (I), R1-(-A1-Z1-)k1-Q-CF2O-A2-(-Z3-A3-)K3-R2, wherein Q represents group (a); W1, W2represent —CH2— and/or —O— independendy from each other, X1, X2, X3, X4represent H, F, —CH3—CH2F—CH2F and/or —CF3independently from each other, provided that at least one substituent X1, X2, X3and/or X4does not represent H, Z2represents a simple bond, —CH2—CH2— or —CF2—CF2—, m represents 0 or 1 and R1, R2, A1, A2, A3, Z1, Z3, k1 and k3 have the meaning cited in the description. The invention further relates to liquid crystal substances such as optical and electro-optical display elements.

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Kirsch, Peer, et al Difluorooxymethylene-bridged liquid crystals. A novel synthesis based on the oxidative alkoxydifluorodesulfuration of dithianylium salts: Angewandte Chemie, International Edition 2001, 40(8), 1480-1484, Apr. 17, 2001.

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