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Title:
LIQUID CRYSTALLINE COMPOUND WITH NEGATIVE DIELECTRIC CONSTANT ANISOTROPY VALUE, LIQUID CRYSTAL COMPOSITION COMPRISING THE COMPOUND, AND LIQUID CRYSTAL DISPLAY ELEMENT USING THE COMPOSITION
Document Type and Number:
Japanese Patent JPH1180049
Kind Code:
A
Abstract:

To obtain a new crystalline compound comprising a specific spiro ring in its molecule, capable of providing a negative dielectric constant anisotropy value large in absolute value, proper refractive index anisotropy, small elastic constant, lower viscosity, good compatibility, and chemical/physical stability, and useful for liquid crystalline elements.

This compound is shown by formula I [R1 and Y1 are each a 1-30C alkyl, etc,; A1 to A5 are each e.g. a group of formula II (W1 to W4 are each H, a halogen, etc., noted that the whole of them are not H simultaneously, and when one of them is other than H, additional other one connected to the same carbon atom is also other than H); and (a1) to (a5) are each 0 or 1], e.g. 1,1-difluoro-2-{2-[trans-4-(2,3- difluoro-4-ethoxy phenyl) cyclohexyl]ethyl}-7-n-propylspiro[3.5] nonane. This example compound is obtained by reacting a compound of formula III with that of formula IV to thereby obtain a compound of formula V, subjecting it to dehydration and hydrogen addition in this order, and turning it into an oxo-compound and followed by difluorination.


Inventors:
KATO TAKASHI
ONISHI TOKUYUKI
Application Number:
JP25137997A
Publication Date:
March 23, 1999
Filing Date:
September 01, 1997
Export Citation:
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Assignee:
CHISSO CORP
International Classes:
C07D239/26; C07C23/22; C07C25/22; C07C43/192; C07C49/163; C07C327/26; C07D213/26; C07D213/30; C07D319/06; C07F7/08; C09K19/32; C09K19/34; (IPC1-7): C07C23/22; C07C25/22; C07C43/192; C07C49/163; C07C327/26; C07D213/26; C07D213/30; C07D239/26; C07D319/06; C07F7/08; C09K19/32; C09K19/34
Domestic Patent References:
JPS559285A1980-01-23
JPS54115038A1979-09-07
Attorney, Agent or Firm:
Katsuhiko Nonaka