83799-89-7

Upstream product

• 83799-92-2 1-(4-n-pentylphenyl)-2-bromoethane 
• 34916-10-4 4-cyanocyclohexanone 
• 7758-99-8 copper(II) sulfate 

Relevant academic research and scientific papers

Liquid crystalline esters and mixtures

Compounds of the formula STR1 wherein X2 is a single covalent bond or --COO--; X1 is a single covalent bond, --COO--, --CH2 CH2 -- or when X2 is --COO--, X1 also can be p--C6 H4 --, p--C6 H4 --CH2 CH2 --, --CH2 CH2 --p--C6 H4, p--C6 H4 --COO-- or --COO--p--C6 H4 ; ring A is a benzene ring or trans-1,4-cyclohexylene; ring B is a benzene ring or when X2 is --COO-- and X1 is a single covalent bond, --COO-- or --CH2 CH2 --, ring B also can be trans-1,4-cyclohexylene; Z1, Z2 and Z3 individually are hydrogen or when positioned on a benzene ring which is not linked directly with a further ring via a single covalent bond, Z1, Z2 and Z3 also can be halogen, cyano or methyl; Y2 is cyano, nitro, 2,2-dicyanovinyl or when Y1 is hydrogen Y2 also can be 2,2-dicyano-1-methylvinyl; Y1 is halogen, cyano, C1 -C3 -alkyl or, when X1 includes a benzene ring or --COO-- or Y2 is nitro or at least one of Z1 and Z2 is other than hydrogen, Y1 also can be hydrogen; and R1 is C1 -C12 -alkyl or when positioned on a benzene ring R1 also can be C1 -C12 -alkoxy, their manufacture and use in liquid crystalline mixtures are described.

Liquid crystal mixture

There is described a liquid crystalline mixture for electro-optical devices which are operated according to the two-frequency matrix addressing procedure. The mixture consists of three components A, B and C, each of which contains one or more compounds. Component A has a viscosity of at most about 40 cp, a clearing point of at least about 40° C. and a dielectric anisotropy between about -2 and about +1. Component B has a dielectric anisotropy below about -2 and component C has a dielectric anisotropy above about +10, a clearing point of at least about 100° C. and there is a cross-over frequency in the total mixture of at most about 15 kHz at 20° C. Novel compounds for such mixtures and their manufacture and use are also described. The novel mixtures make possible especially high multiplex rates and short response times.

Liquid crystalline cyclohexylcarbonitrile derivatives

Cyclohexylcarbonitrile derivatives of the formula I STR1 wherein Y is STR2 X is --COO--, --O--CO, --CH2 O--, --OCH2 -- or --CH2 CH2 --, and R is alkyl or alkoxy each of 1-12 carbon atoms, with the proviso that Y is not STR3 when X is --COO--; and all cyclohexyl rings are trans, are valuable liquid crystalline components.