Abstract: A liquid crystal composition comprising one or more types compounds represented by general formula II: ##STR1## and one or more types of compounds selected from the group consisting of: ##STR2## wherein R, rings A and B, X, Y1, Y2, Y3, Y4 and m are defined herein.

Abstract: Described is a guest host liquid crystal composition comprising as a host liquid crystal a liquid crystal composition containing some of the compounds represented by the formulas (I) to (V) which will be described below; and at least four dichromatic dye compounds.

Abstract: A silacyclohexane compound of the formulas (I) ##STR1## wherein R represents an organic residue, ##STR2## represents an unsubstituted or substituted silicon-containing cyclohexylene group or a 1,4-cyclohexylene group, ##STR3## represents an unsubstituted or substituted phenylene, an unsubstituted or substituted silicon-containing cyclohexylene group or trans-4-sila-1,4-cyclohexylene group, or a 1,4-cyclohexylene group provided that at least one of these residues represents a silicon-containing cyclohexylene group, m, n, i, k and l are, respectively, 0 or 1 provided that j+l=0 or 1 and m+k=1 or 2, L.sub.1 and L.sub.2, respectively, represent H or F, m and n are, respectively, 0 or 1, X.sub.1 and Y independently represent H, F or Cl, and X.sub.2 represents F or Cl. A liquid crystal composition comprising the silacyclohexane compound of the above formula is also described, along with a liquid crystal device comprising the composition.

Abstract: An optically active silacyclohexane compound of the formula (I) ##STR1## wherein R represents an organic residue, X represents --CH.sub.2 -- or --O--; Z represents a chiral group having at least one chiral carbon atom; L.sub.1 and L.sub.2 independently represent H or F, n is 0 or 1; ##STR2## represents a trans-1-sila-1,4-cyclohexylene group or trans-4-sila-1,4-cyclohexylene group whose silicon atom at the 1 or 4 position has H, F, Cl or CH.sub.3, or a 1,4-cyclohexylene group; and ##STR3## represents a trans-1-sila-1,4-cyclohexylene group or trans-4-sila-1,4-cyclohexylene group whose silicon atom at the 1 or 4 position has H, F, Cl or CH.sub.3, a 1,4-cyclohexylene group or a 1,4-phenylene group provided that at least one of ##STR4## represents the trans-1-sila-1,4-cyclohexylene group or trans-4-sila-1,4-cyclohexylene group defined above. A liquid crystal composition comprising the compound defined above and a liquid crystal display device comprising the composition are also described.

Abstract: For the purpose of improving the characteristics of a liquid crystal substance, there is provided a silacyclohexane compound represented by the general formula (I): ##STR1## wherein R represents a specific straight-chain alkyl group, mono or difluoro alkyl group, branched-chain alkyl group, alkoxyalkyl group, and alkenyl group; at least one of rings A and B represent a trans-1-sila-1,4-cyclohexylene group or a trans-4-sila-1,4-cyclohexylene group both having a substituent group H, F, Cl, CH.sub.3 or Ar (Ar stands for a phenyl or tolyl group) on silicon at the 1 or 4 position, and the other group, if any, represents a trans-1,4-cyclohexylene group or ##STR2## Z represents CN, F, Cl, CF.sub.3, CClF.sub.2, CHClF, OCF.sub.3, OCClF.sub.2, OCHF.sub.2, OCHClF, R, or OR; L.sub.1 represents H, F or Cl; L.sub.2 and L.sub.3 stand independently for H or F; i represents an integer of 0 to 2; m is 1 or 2; n is 0 or 1; and if m is 2, the two rings may be the same or different.

Abstract: A cyclohexanone compound of the following general formula (I) is provided ##STR1## wherein Ar represents a phenyl group or a tolyl group, and R represents a phenyl group, a tolyl group, a linear alkyl group having from 1 to 10 carbon atoms, a mono or difluoroalkyl group having from 1 to 10 carbon atoms, a branched alkyl group having from 3 to 8 carbon atoms or an alkoxyalkyl group having from 2 to 7 carbon atoms. The preparation of the cyclohexanone compound is also described along with processes for preparing liquid crystal compounds from the cyclohexanone compound.

Abstract: A silacyclohexane compound represented by the following general formula (I): ##STR1## wherein R denotes a mono- or di-fluoroalkyl group with 1-10 carbons: ##STR2## denotes a trans-1-silacyclohexylene or a trans-4-silacyclohexylene group whose silicon at position 1 or position 4 has a substitutional group of H, F, Cl or CH.sub.3 ;X denotes a CN, F, Cl, CF.sub.3, CF.sub.2 Cl, CHFCl, OCF.sub.3, OCHF.sub.2, OCF.sub.2 Cl, OCHFCl, (O).sub.3 CY.sub.1 .dbd.CX.sub.1 X.sub.2 (X.sub.1 and Y.sub.1 denote H, F or Cl, and X.sub.2 denotes F or Cl) (O).sub.3 C.sub.p H.sub.q F.sub.r (p denotes 2, 3 or 4, and q and r are integers which satisfy the equation q+r=2p+1, and s denotes 0 or 1), the aforementioned R, or an alkyl or alkoxy group with 1-5 carbons;Y denotes H or F; andZ denotes H or F;and process of manufacturing same.

Abstract: Silacyclohexane compounds of the following formula (I) or (II) along with intermediate compounds therefor are described ##STR1## wherein R is an organic residue, one of ##STR2## represents a trans-1-sila-1,4-cyclohexylene group or trans-4-sila-1,4-cyclohexylene group having a substituent of H, F, Cl or CH.sub.3, and the other represents a trans-1,4-cyclohexylene group, or such a trans-1-sila-1,4-cyclohexylene group or trans-4-sila-1,4-cyclohexylene group as defined above, n is 0 or 1, L.sub.1 represents H or F, L.sub.2 represents H, F or Cl, and Z represents CN, F, Cl or an organic residue, and ##STR3## The processes for preparing the compounds (I) and (II) are also described along with liquid crystal compositions comprising the compounds and the liquid crystal devices comprising the compositions.

Abstract: A silacyclohexane compound represented by the following general formula (I). ##STR1## In this formula, R denotes a linear-chain alkyl group with a carbon number of 1-10, a mono- or di- fluoro-alkyl group with a carbon number of 1-10, a branched-chain alkyl group with a carbon number of 3-8, an alkoxyalkyl group with a carbon number of 2-7, or an alkenyl group with a carbon number of 2-8. ##STR2## denotes trans-1-sila-1,4-cyclohexylene or trans-4-sila-1,4-cyclohexylene group whose silicon at position 1 or position 4 has a substitutional group(s) of H, F, Cl or CH.sub.3. X denotes a CN, F, Cl, CF.sub.3, CF.sub.2 Cl, CHFCl, OCF.sub.3, OCHF.sub.2, OCF.sub.2 Cl, OCHFCl, R or OR group (R is the same as defined in the general formula (I)). Y.sub.2 and Z denote H or F, independently to each other. Y.sub.1 denotes H, F or Cl.

Abstract: A silacyclohexane compound of the following formula (I) ##STR1## wherein R is an unsubstituted or substituted organic residue, W is H, F, Cl or methyl, X is CN, F, Cl or an unsubstituted or substituted organic residue, and Y and Z independently represent H, F or Cl. The silacyclohexane compounds are useful in liquid crystal compositions and also in liquid crystal devices.

Abstract: A silacyclohexane compound of the following formula (I) or (II) ##STR1## wherein R is an organic residue, ##STR2## represents an unsubstituted or substituted trans-1-sila-1,4-cyclohexylene group or trans-4-sila-1,4-cyclohexylene group, L.sub.1 and L.sub.2 independently represent H, F, Cl or CH.sub.3 ; and X represents an organic residue, CN, F or Cl, or ##STR3## wherein R, L.sub.1, L.sub.2 and X are, respectively, as defined above, and at least one of ##STR4## represents an unsubstituted or substituted trans-1-sila-1,4-cyclohexylene group or trans-4-sila-1,4-cyclohexylene group, and the other may be a trans-1,4-cyclohexylene group. The preparation of these compounds is described along with a composition comprising the compound (I) and/or (II) and a display device comprising the composition.

Abstract: A silacyclohexane compound of the following formula (I) ##STR1## wherein R represents an organic residue; ##STR2## represents a trans-1-sila-1,4-cyclohexylene group or trans-4-sila-1,4-cyclohexylene group having a substituent of H, F, Cl or CH.sub.3 ; L.sub.1 represents F, L.sub.2 and L.sub.3 independently represent H, F, Cl or CH.sub.3 ; X represents an organic residue, F or Cl; and n is an integer of 0, 1, or 2 and a and b are, respectively, 0 or 1 provided that a+b=1. Silacyclohexane compounds are useful in liquid crystal compositions and also in liquid crystal devices.

Abstract: A silacyclohexane compound of the following formula (I) ##STR1## wherein R represents an organic residue; at least one of ##STR2## represents a substituted or unsubstituted trans-1-sila-1,4-cyclohexylene group or trans-4-sila-1,4-cyclohexylene group and the other represents a trans-1,4-cyclohexylene group, L.sub.1 and L.sub.2 independently represent H, F, Cl or CH.sub.3 ; X represents an organic residue or CN, F, Cl; and m and n are, respectively, 0 or 1 provided that m+n=1. Silacyclohexane compounds are useful in liquid crystal compositions and also in liquid crystal devices.

Abstract: A triflate compound of the following general formula is provided ##STR1## wherein Ar represents a phenyl group or a tolyl group, R represents a phenyl group, a tolyl group, a linear alkyl group having from 1 to 10 carbon atoms, a mono or difluoroalkyl group having from 1 to 10 carbon atoms, a branched alkyl group having from 3 to 8 carbon atoms, an alkoxyalkyl group having from 2 to 7 carbon atoms and an alkenyl group having from 2 to 8 carbon atoms, Tf represents a trifluoromethanesulfonyl group, and Y represents H or F. A process for preparing silacyclohexane-based liquid crystal compounds from the triflate compound is also described.

Abstract: A silacyclohexane compound represented by the following general formula (I). ##STR1## In this formula, R denotes a linear-chain alkyl group with a carbon number of 1-10, a fluoroalkyl group with a carbon number of 1-10 in which a fluorine atom(s) is substituted for one or two hydrogen atoms, an alkoxy group, a branched-chain alkyl group with a carbon number of 3-8, an alkoxyalkyl group with a carbon number of 2-7, or an alkenyl group with a carbon number of 2-8. a and b denote 0 or 1 and (a+b)=0 or 1; For ##STR2## at least one of the two denotes a trans-1-sila-1,4-cyclohexylene or a trans-4-sila-1,4-cyclohexylene group whose silicon at position 1 or position 4 has a substitutional group(s) of H, F, Cl or CH.sub.3. X denotes H, CN, F, Cl, CF.sub.3, CF.sub.2 Cl, CHFCl, OCF.sub.3, OCF.sub.2 Cl, OCHFCl, OCHF.sub.2, R or OR. Y and Z denote F, Cl or CH.sub.3. i and j denotes 0, 1 or 2.

Abstract: A silacyclohexane compound represented by the following general formula (I) ##STR1## wherein R denotes a linear-chain alkyl group with a carbon number of 1-10, a fluoroalkyl group with a carbon number of 1-10 in which a fluorine atom(s) is substituted for one or two hydrogen atoms, a branched-chain alkyl group with a carbon number of 3-8, an alkoxyalkyl group with a carbon number of 2-7, or an alkenyl group with a carbon number of 2-8. ##STR2## denotes a trans-1-sila-1,4-cyclohexylene or trans-4-sila-1,4-cyclohexylene group whose silicon at position 1 or position 4 has a substitutional group(s) of H, F, Cl or CH.sub.3. L.sub.1 and L.sub.2 independently denote H or F. L.sub.3 and L.sub.4 independently denote H, F or Cl. X denotes a H, CN, F, Cl, CF.sub.3, CF.sub.2 Cl, CHFCl, OCF.sub.3, OCF.sub.2 Cl, OCHFCl, OCHF.sub.2, or a linear-chain alkyl or alkoxy group with a carbon number of 1-10. i, j and k respectively denote 0 or 1, where (i+j+k) is 0 or 1. n denotes 0, 1 or 2.

Abstract: A liquid crystal composition comprising a silacyclohexane compound represented by the following formula (I): ##STR1## wherein R and R' denote an alkyl group, a mono- or di-fluoroalkyl group, an alkoxyalkyl group or an alkenyl group; at least one of ##STR2## denotes a silacyclohexylene group whose silicon at positions 1 or 4 has a substitutional group of H, F, Cl of CH.sub.3, and the other denotes a silacyclohexylene group whose silicon at positions 1 or 4 has a substitutional group of H, F, Cl or CH.sub.3 or a cyclohexylene group; and 0-2 of the substitutional groups X on the aromatic rings denote F and the remaining X's denote H.

Abstract: A silacyclohexane compound of formula (I): ##STR1## wherein R denotes a linear-chain alkyl group, a mono- or di-fluoroalkyl group, a branched-chain alkyl group, an alkoxyalkyl group, or an alkenyl group: at least one of ##STR2## denotes a 1-sila-1,4-cyclohexylene or a 4-sila-1,4-cyclohexylene group whose silicon at position 1 or 4 is H, F, Cl or CH.sub.3, and the other denotes a 1,4-cyclohexylene group, a 1-sila-1,4-cyclohexylene or a 4-sila-1,4-cyclohexylene group whose silicon at position 1 or 4 is H F, Cl or CH.sub.3 ; X denotes a substitutional group at an equatorial position, specifically CN, an alkyl group with its end group replaced by a trifluoromethyl group, an alkoxy group, an alkanoyloxy group, an alkoxycarbonyl group, a linear-chain alkyl group, or an alkoxyalkyl group; Y denotes a group at an axial position, specifically H or CN when Y is connected to a carbon atom in said (B) group or H, F, Cl or CH.sub.3 when Y is connected to a silicon atom in said (B) group.

Abstract: A process for preparing a silacyclohexane compound of the general formula ##STR1## wherein R and Q are, respectively, defined substituents, which process comprising the steps of converting a compound of the following formula ##STR2## to a halosilacyclohexane of the following formula ##STR3## wherein X is a halogen, reacting the halosilacyclohexane with an alcohol to obtain an alkoxysilacyclohexane of the formula which is equilibrated in steric configuration, and ##STR4## reducing the equilibrated alkoxysilacyclohexane whereby a trans form silacyclohexane compound is predominantly produced.

Abstract: A silacyclohexane compound represented by the following general formula (I). ##STR1## In this formula, R denotes hydrogen, a linear-chain alkyl group with a carbon number of 1-10, a branched-chain alkyl group with a carbon number of 3-8, an alkoxyalkyl group with a carbon number of 2-7, a fluoroalkyl group with a carbon number of 1-10 in which one or two hydrogen atoms are substituted by florine atom(s), or an alkenyl group with a carbon number of 2-8. For the groups ##STR2## at least one of these is a trans-1-sila-1,4-cyclohexylene or trans-4-sila-1,4-cyclohexylene group whose silicon at position 1 or position 4 has a substitutional group(s) of H, F, Cl or CH.sub.3, and the other denotes a trans-1,4-cyclohexylene group. X denotes a CN, F, Cl, CF.sub.3, CF.sub.2 Cl, CHFCl, OCF.sub.3, OCHF.sub.2, OCF.sub.2 Cl, OCHFCl, R or OR group (R is the same as defined earlier). Y denotes H or F. Z denotes H or F.