Fluorinated heterocycles and their use in liquid-crystal...

Details Fluorinated heterocycles and their use in liquid-crystal... Fluorinated heterocycles and their use in liquid-crystal...

2007-08-14

2007-08-14

Wu, Shean C. (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299610, C252S299620, C549S458000, C570S183000, C570S187000

Reexamination Certificate

active

11117280

ABSTRACT:
In the compound of the formula (I),where:R1, R2are each independently, for example, H or a straight-chain or branched alkyl radicalp, q are each independently 0 or 1, i.e. at the value zero, —H is present at the appropriate position instead of —FM1is —CO—O—, —O—CO—, —CH2—O—, —O—CH2—, —CF2—O—, —O—CF2—, —CH═CH—, —CF═CF—, —C≡C—, —CH2—CH2—CO——O—, —O—CO—CH2—CH2—, —CH2—CH2—, —CF2—CF2—, —(CH2)4—, —OC(═O)CF═CF— or a single bondA1is, for example, 1,4-phenyleneR5has the same possible definitions as specified for R1and R2, with the exception of —M1—A1—R5, but independently of the definition of R1and R2X is H, F, OF3, CF3, OCF2Hwith the following provisos:a) at least one of p, q has to be 1b) R1and R2must not at the same time be Hc) R2and X must not at the same time be H.

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English language abstract of EP 1 223 210.
Ichinose et al., “High Optical Anisotropy and Small Rotational Viscosity LC Mixture for Field-Sequential Color TN-LCDs”, IDW, LCT4-3, pp. 77-pp. 80 (2000).
Brown et al., “Aromatic Polyfluoro-Compounds-XXXVIII1,2,3,4-Tetrafluorodibenzofuran and Some Nucleophilic Replacement Reactions”, Tetrahedron, vol. 23, pp. 4041-pp. 4045 (1967).
Machine English Translation of JP 10-236992 from the Japanese Patent Office.

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