摘要:
An optically active compound having a high twistability and almost no change in the intrinsic pitch depending on temperature, and a liquid crystal composition comprising the compound are provided, which optically active compound is expressed by the formula ##STR1## wherein R.sup.1 and R.sup.2 each represent 1-20C alkyl or alkoxy, halogen or H; l, m and n each represent 0 or 1; and ##STR2## wherein Y represents H, halogen or cyano.
摘要:
The present invention provides a process for producing optically active compounds by a biochemical method in which specific compounds having pyridine skeletons and hydroxyl groups are reacted with esters in the presence of hydrolases.The compounds have the following general formula: ##STR1## wherein X is selected from substituted pyridyl groups. Y is selected from hydrogen and halogen atoms, a cyano group, and a trifluoromethyl group. R is an alkylene group having 1-20 carbon atoms, and n is 0 or 1. Q is an alkylene group having 1-20 carbon atoms and m is 0 or 1.
摘要:
A novel optically active pyridylethanol derivative having a high twistability and also a superior temperature characteristic is provided, which derivative is expressed by the formula ##STR1## wherein R is an alkyl group of alkoxy group each of 1 to 20 carbon atoms or hydrogen atom, m and n each represent 0 or 1, ##STR2## each independently represent ##STR3## wherein Y is any one of H, halogen atom or CN and ##STR4## is a pyridine ring the N atom of which may be present at an optionally chosen site thereof.
摘要:
The present invention provides a process for producing optically active compounds by a biochemical method in which specific compounds having hydroxyl groups are reacted with esters in the presence of hydrolases. The compounds have the following general formula: ##STR1## wherein X is selected from halogen atoms and a cyano group. Y is selected from the group constituting substituted phenyl groups, halogen atoms, cyano, trifluoromethyl and amino groups and alkylamino and alkyloxycarbonyl groups in which alkyl groups have 1-20 carbon atoms. R is an alkylene group having 1-20 carbon atoms and n is 0 or 1.
摘要:
The present invention provides optically active compounds and a process for producing the optically active compounds by a biochemical method in which specific compounds having hydroxyl or acyloxy groups are reacted with esters in the presence of hydrolase. The compounds have the following general formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are selected from alkyl groups having 1-4 carbon atoms and phenyl groups, X is selected from a hydrogen atom and ##STR2## R is selected from alkyl groups having 1-20 carbon atoms, and C* indicates an asymmetric carbon atom.
摘要:
An electroluminescence element (EL) obtained by using a silacyclopentadiene derivation expressed by the general formula (I) and the derivative are provided. ##STR1## (wherein X and Y are independently hydrocarbon radicals with from 1 to 6 atoms and R.sub.1 to R.sub.4 are hydrogen, halogens, alkyl radicals with from 1 to 6 carbon atoms, or a condensed (un)substituted ring if being adjacent).
摘要:
The present invention provides a silacyclopentadiene derivative represented by the following Formula (1): ##STR1## wherein X.sub.1 and Y.sub.1 represent independently a halogen atom, an amino group, a hydroxyl group, or an amino group or a hydroxyl group each having a substituent; R.sub.1 to R.sub.4 represent independently a hydrogen atom, a halogen atom, an alkyl group, an amino group, a silyl group, an aryl group, a cyano group, or the respective groups describe above each having a substituent; out of the groups represented by R.sub.1 to R.sub.4, those adjacent may be combined with each other to form rings; when R.sub.1 and R.sub.4 are phenyl groups or when combined are R.sub.1 with R.sub.2 and R.sub.3 with R.sub.4 respectively to form benzene rings, X.sub.1 and Y.sub.1 are not a chlorine atom or a hydroxyl group; and when R.sub.1 and R.sub.4 are methyl groups, X.sub.1 and Y.sub.1 are not bromine atoms.
摘要:
A porous cellulose acetate molding containing an odoriferous substance is provided which is prepared by incorporating an odoriferous substance in a porous molding comprising cellulose acetate having a combined acetic acid of 50 to 58%, a pore volume of at least 0.65 cc/g and a collapsing strength of at least 10 kg. Said porous cellulose acetate may be one which is surface-saponified. Examples of the odoriferous substances include volatile substances such as insect repellents, antibacterials and mold inhibitors. Said porous cellulose acetate molding can adsorb the odoriferous substances fully without substantially changing its shape and persistently volatilize the substance for a long time.
摘要:
Secondary cellulose acetate (cellulose diacetate) of improved whiteness is produced by ripening primary cellulose acetate (cellulose triacetate) using a lower aliphatic alcohol instead of an aqueous medium.
摘要:
A compound represented by the following Formula (1) is useful as an electron transport material of an organic EL device, and an organic EL device comprising the compound in the electron transport layer is long in life, and low in drive voltage: wherein G is an n-valent link, n is an integer of 2 to 4; R1 to R4 are each independently hydrogen, a monovalent group, or a free valency bonded with G, and R5 to R8 are each independently hydrogen or a monovalent group, and one of R1 to R4 is a free valency bonded with G; and n groups of 2,3′-bipyridyl may be the same or different with each other.
摘要翻译:由下式(1)表示的化合物可用作有机EL器件的电子传输材料,并且包含电子传输层中的化合物的有机EL器件寿命长,驱动电压低:其中G为 n价连接,n为2〜4的整数, R 1〜R 4各自独立地为氢,一价基团或与G键合的自由价,R 5〜R 8各自独立地为氢或一价基团,R 1〜R 4中的一个为与G键合的自由价; 并且n个2,3'-联吡啶基可以彼此相同或不同。