123843-57-2Relevant articles and documents
Cyclic hydrocarbon derivative and liquid crystal composition containing the same
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, (2008/06/13)
A cyclic hydrocarbon derivative represented by formula (I): STR1 wherein each of Y1 and Y2 is independently F, Cl, CN, OCN, SCN, OCF3, OCF2 H, OCF2 CF3, CF3, R, --OR, --COOR or --OCOR, wherein R is alkyl, alkenyl or alkoxyalkyl, provided that at least one of Y1 and Y2 is R, --OR, --COOR or --OCOR; each of Z, Z1, Z2, Z3 and Z4 is independently a single bond, --CH2 CH2 --, --CH=CH--, --C C--, --COO--, --OCO--, --CH2 O--, OCH2 --, --(CH2)4 --, --(CH2)3 --O-- or --O--(CH2)3 --; ring A is group of formula (II): STR2 wherein each of X1, X2, X3, X4, X5, X6, X7, X8, X9, and X10 is independently H or D, provided that at least one of them is D; each of rings K, L, J, M and N is independently trans-1,4-cyclohexylene, 1,4-cyclohexenylene, substituted trans-1,4-cyclohexylene, 1,4-phenylene, substituted 1,4-phenylene, 1,3-dioxane-2,6-diyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl, pyarazine-2,5-diyl or a group of formula (III): STR3 wherein each of X11, X12, X13, X14, X15, X16, X17, X18, X19, and X20 is independently H or D, provided that at least one of them is D; in which the ring of formula (III) may be the same as or different from ring A; and k, l, m, and n each independently is 0 or 1, provided that the sum of k, l, m, and n is 0, 1 or 2. The compound is useful as an electro-optic liquid crystal display material.
The Synthesis and Transition Temperatures of Some Fluoro-Substituted 4-Cyanophenyl and 4-Cyanobiphenyl-4'-yl 4-Pentyl- and 4-Butoxy-Benzoates
Gray, G. W.,Hird, M.,Lacey, D.,Toyne, K. J.
, p. 165 - 190 (2007/10/02)
A series of 4-cyanophenyl 4-X-benzoates and a series of 4-cyanobiphenyl-4'-yl 4-X-benzoates (X= pentyl, butoxy) have been prepared without fluoro-substitution and with mono-fluoro to tetra-fluoro-substitution; all possible combinations of substitution patterns at the positions ortho- to the cyano group and ortho- to the carboxylate group have been obtained in an attempt to determine the structural features which are responsible for some members of these series showing very large positive values of dielectric anisotropy.The synthesis of novel precursors required for the preparation of these esters is described and the melting points and transition temperatures of the esters are discussed and an explanation is provided for the variation of Tn-1 values with position and extent of fluoro-substitution. - Keywords: Fluoro-substitution, phenyl and biphenyl benzoates, terminal cyano namatogens.
