摘要:
Halogenobiphenyl derivatives of Formula I ##STR1## wherein R.sup.1 and R.sup.2 are each alkyl or alkoxy in each case of 1-10 C atoms, Cy is 1,4-cyclohexylene, Ph is 1,4-phenylene, Q is --O--Cy-- or --O--Ph--, m and n are each 0 or 1 and X is F, Cl or Br, can be used as components of liquid crystal dielectrics for electrooptical display elements.
摘要:
Halogenobiphenyl derivatives of Formula I ##STR1## wherein R.sup.1 and R.sup.2 are each alkyl or alkoxy in each case of 1-10 C atoms, Cy is 1,4-cyclohexylene, Ph is 1,4-phenylene, Q is --O--Cy-- or --O--Ph--, m and n are each 0 or 1 and X is F, Cl or Br, can be used as components of liquid crystal dielectrics for electrooptical display elements.
摘要:
Thienothiophene derivatives of the formula IR.sup.1 --(A.sup.1).sub.m --Z.sup.1 --A--(Z.sup.2 --A.sup.2).sub.n --R.sup.2 Iin which R.sup.1 and R.sup.2 are each H or an alkyl group having 1-12 C atoms, in which, furthermore, one or two non-adjacent CH.sub.2 groups can be replaced by O atoms, --CO-- or --CH.dbd.CH-- groups, or are each F, Cl, Br, CN, --COOR or --O--COR, A.sup.1 and A.sup.2 are each 1,4-phenylene, 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, 1,3-dithiane-2,5-diyl, tetrahydropyran-2,5-diyl, pyridazine-3,6-diyl or the corresponding N-oxide, piperidine-1,4-diyl, 1,4-bicyclo[2.2.2]octylene or pyrimidine-2,5-diyl groups which are unsubstituted or substituted by one or two F, Cl or Br atoms and/or CN groups and/or CH.sub.3 groups, A is a group of the formula 1 or 2 ##STR1## which is unsubstituted or substituted by one or two Cl and/or Br atoms, Z.sup.1 and Z.sup.2 are each --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O-- or a single bond, R is an alkyl group having 1-10 C atoms, m is 1 or 2 and n is 0 or 1, and where m is 2, the two groups A.sup.1 can be identical or different, can be used as components of liquid crystalline phases.
摘要:
New bicyclohexylethanes of formula IR1--Cy--Cy--CH2CH2--A--(Cy)n--R2 (I)wherein R1 is alkyl; R2 is alkyl, in which one or two non-adjacent CH.sub.2 groups can be replaced by 0 atoms, or is F, Cl, Br, CN, --COOalkyl or --O--CO--alkyl; or one of the radicals R.sup.1 and R.sup.2 can also be H; A is Cy, or 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl atoms and/or CH.sub.3 groups or by a CN group; Cy is 1,4-cyclohexylene and n is 0 or 1; the alkyl groups in each case containing 1-10 C atoms, with the proviso that n is 1 if A is Cy and R2 is CN, can be used as constituents of dielectrics for electrooptical display elements.
摘要:
New bicyclohexylethanes of formula IR.sup.1 --Cy--Cy--CH.sub.2 CH.sub.2 --A--(Cy).sub.n --R.sup.2 (I)wherein R.sup.1 is alkyl; R.sup.2 is alkyl, in which one or two non-adjacent CH.sub.2 groups can be replaced by O atoms, or is F, Cl, Br, CN, --COOalkyl or --O--CO-alkyl; or one of the radicals R.sup.1 and R.sup.2 can also be H; A is Cy, or 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl atoms and/or CH.sub.3 groups or by a CN group; Cy is 1,4-cyclohexylene and n is 0 or 1; the alkyl groups in each case containing 1-10 C atoms, with the proviso that n is 1 if A is Cy and R.sup.2 is CN,can be used as constituents of dielectrics for electrooptical display elements.
摘要:
4-Fluorobiphenyl derivatives of the formula (I) ##STR1## wherein X is --CO--O-- or --O--CO--; Z is 1,4-phenylene or 1,4-cyclohexylene; and R is alkyl, alkoxy or alkanoyloxy, each of 1 to 8 atoms, are valuable components of liquid-crystalline dielectrics for electro-optical applications.
摘要:
The invention concerns a process disclosed for the pre-treatment of synthetic materials (plastics), particularly polyetherimide, polycarbonate and poly(ester-co-carbonate), for the adhesive chemical metallization, involving treating the synthetic material with a quaternary base dissolved in an organic solvent.
摘要:
Pyrimidine derivatives of the formula IR.sup.1 --Pry--A.sup.1 --Z.sup.1 --A.sup.2 -[Z.sup.2 --A.sup.3 ].sub.m --R.sup.2 Iin whichR.sup.1 and R.sup.2 each are an alkyl group having 1 to 12 C atoms, in which one or two non-adjacent CH.sub.2 groups can also be replaced by --O--, --CO--, --O--CO--, --CO--O-- or --CH.dbd.CH--, and one of the radicals R.sup.1 and R.sup.2 are H, F, Cl, Br or CN,Pyr is pyrimidine-2,5-diyl,A.sup.1 and A.sup.3 each are 1,4-cyclohexylene, unsubstituted 1,4-phenylene or 1,4-phenylene which is substituted by one or two F and/or Cl atoms and/or CH.sub.3 and /or CN groups,A.sup.2 is 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl atoms and/or CH.sub.3 and/or CN groups,Z.sup.1 is --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, or --OCH.sub.2 --Z.sup.2 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --O--CH.sub.2 -- or a single bond, andm is 0 or 1,are suitable for preparing liquid crystal phases having steep electro-optical characteristic curves.
摘要:
Liquid-crystalline materials can be outgassed by thermal treatment under reduced pressure in a thin-layer evaporator or with additional ultrasonic treatment.
摘要:
A process for preparing a 2,6-bis-[(4-azidophenyl)methylene]-cyclohexanone of the formula ##STR1## wherein R is hydrogen or alkyl of 1-6 C atoms, comprises condensing a cyclohexanone of the formula ##STR2## wherein R is as defined above, with 4-aminobenzaldehyde, the 4-amino group optionally being protected, in the presence of an alkaline condensing agent; removing the protective group when the 4-amino group is protected; diazotizing the resultant 2,6-bis-[(4-aminophenyl)methylene]-cyclohexanone of the formula ##STR3## wherein R is as defined above, and reacting the diazotization product with an alkali metal azide.