Cyclohexyl pyrimidines

Details Cyclohexyl pyrimidines Cyclohexyl pyrimidines

C - Chemistry, Metallurgy

07

D

31/105, 260/251

C07D 239/26 (2006.01) C09K 19/34 (2006.01) C09K 19/60 (2006.01)

Patent

CA 1120478

ABSTRACT The invention provides novel pyrimidine derivatives of the formula Image wherein at least one of the rings A and B represents a trans-1,4-disubstituted cyclo- hexane ring and the other is optionally aromtic m d R represents a straight-chain alkyl or alkoxy group containing 1 to 10 carbon atoms or a branched-chain alkyl group of tha formula C2H5CH(CH2)-(CH2)n- which n stands for 1, 2 or 3. The invention also provides a process for the manu- facture of the pyrimdine derivatives of formula I by dehydrating a compound of the formula II Image - 2 - , wherein A, B and R have the significance given earlier, or, for the manufacture of pyrimidine derivatives of formula I in which ring A represents a cyclohexyl ring and ring B represents a benzene ring, by reacting a compound of the formula Image III , wherein R and A have the significance given earlier and X represents a fluorine, chlorine or bromine atom, with copper-(I) cyanide, sodium cyanide or potassium cyanide. Further, the invention provides nematic and cholesteric mixtures which contain pyrimidine derivatives of formula I and, if desired, dichroic colouring substances, electro- -optical apparatuses which contain pyrimidine derivatives of formula I, the use of pyrimidine derivatives of formula I for electro-optical purposes and the manufacture of said mixtures and apparatuses. The pyrimidine derivatives of formula I are par- ticularly valuabe as components of liquid crystalline mixtures. They possess an especially large mesophase range with high clearing points, a large positive anisotropy of - 3 - the dielectric constants and accordingly low threshold potentials, a short relay time and high chemical stability.

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