Hexahydrodibenzofuran derivatives

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

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C349S184000, C549S461000

Reexamination Certificate

active

07417157

ABSTRACT:
Disclosed are hexahydrodibenzofuran compounds of formula I,the preparation thereof, the use thereof as components in liquid-crystalline media, and to electro-optical display elements which contain the liquid-crystalline media according to the invention.

REFERENCES:
patent: 5231198 (1993-07-01), Powers et al.
patent: 7018685 (2006-03-01), Schmidt et al.
patent: 2005/0258397 (2005-11-01), Schmidt et al.
patent: 2005/0258399 (2005-11-01), Schmidt et al.
patent: 10 2004 020 479 (2005-11-01), None
patent: 10 2004 021 691 (2005-11-01), None
patent: WO 02/055463 (2002-01-01), None
patent: WO 02/055463 (2002-07-01), None
V. Grant et al., “Iridium(III)-catalyzed tandem claisen rearrangement-Intramolecular hydroaryloxylation of aryl allyl ethers to form dihydrobenzofurans”, Tetrahedron Letters, vol. 46 (2005) pp. 1237-1239.

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