摘要:
A novel phenylpyrimidinecarboxylate derivative which, when used as a component of liquid crystal compositions, can raise the clearing point of the mesomorphic range of the liquid crystal compositions and/or increase the dielectric anisotropy value of the compositions, and a liquid crystal compositions containing the derivative are provided, which derivative is expressed by the formula ##STR1## wherein X.sup.1 represents an alkyl or alkoxy each of 1-10 C; X.sup.2 represents a 4-substituted phenylk having an alkyl, of 1-10 C, F, Cl, Br or --CN at 4-position or a 3,4-disubstituted phenyl having F, Cl, Br or Cn at 4-position and F, Cl or Br at 3-position; and L represents a N atom and M represents a C atom.
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:
A novel 1,4-dipyrimidinylbenzene derivative which is useful as a component constituting a liquid crystal composition which is superior in properties and also physically and chemically stable, as a material for liquid crystal display elements, and a liquid crystal composition containing the same are provided, which derivative is expressed by the formula ##STR1## wherein X represents an alkyl group or an alkoxy group each of 1 to 10 carbon atoms, methylthio group or cyano group and Y represents an alkyl group or an alkoxy group each of 1 to 10 carbon atoms.
摘要:
The present invention provides a compound selected from sulfated cellulose and salts thereof which can be used as an active ingredient for a cutaneous external preparation produced intending to prevent, soften, improve or cure atopic cutaneous symptoms and the like and which are excellent in a hydrolytic resistance, and dermatitis therapeutic agents and cosmetics using the same.
摘要:
The invention provides a cosmetic ingredient and cosmetic compositions containing the same that exhibit skin protection/recovery properties and which are suitable for use in various cosmetic forms, such as skin care cosmetics, makeup cosmetics and skin cleansing agents. The cosmetic ingredient and cosmetic compositions containing the same include spherical sulfated cellulose or a salt thereof prepared by sulfate esterification of a part of the hydroxy groups of spherical cellulose.
摘要:
The invention provides spherical sulfated cellulose which has a high sulfur content and which is excellent for adsorbing proteins, a production process for the same, a protein adsorbing agent containing the above spherical sulfated cellulose and a chromatography apparatus using the same for a filler. More specifically, the invention provides a process for producing spherical sulfated cellulose comprising a step in which spherical cellulose is subjected to at least one sulfate esterification treatment with a mixture of N,N-dimethylformamide and sulfuric anhydride.
摘要:
Intermediate compounds, including 2-(t-butyldimethylsilyloxymethyl)-3,4-[(dimethylmethylene)dioxy]-5-hydroxy-tricyclo[5.2.1.02,6]dec-8-ene, which are useful for the synthesis of neplanocin A having strong antitumor activity. Improved processes for the preparation of neplanocin A, starting from optically active 2-hydroxymethyl-5-hydroxy-tricyclo[5.2.1.02,6]deca-3,8-diene and via a key step comprising a retro-Diels-Alder reaction of the above intermediate.
摘要:
Compound of the formula (I): wherein Ar is a group of the following formula (Ar-1) or (Ar-2): A is a group of the formula: —Z—N(Q1)(Q2), —CO—R7 or —(CH2)p—CH(R8)—COR9, or a pharmaceutically acceptable acid addition salt thereof, a process for preparing the same, a pharmaceutical composition containing the same, and intermediates therefor. The compounds of the present invention show a potent affinity for 5-HT4 receptors, and they are useful as a gastrointestinal motility enhancer or a gastrointestinal prokinetic agent.
摘要:
A semiconductor stacked type dynamic random access memory device has a node contact hole formed in an inter-level insulating layer and a storage electrode held in contact with a source region of an access transistor through the node contact hole, and the node contact hole and the storage electrode are patterned by using a photo-lithography and an etching, wherein a photo-resist mask for the node contact hole is different in thickness from a photo-resist mask for the storage electrode by value equivalent to a half of the period of the periodicity representative of sensitized characteristics of the photo-resist in the presence of an optical standing wave in the photo-resist masks, thereby keeping the nesting tolerance between the two patterns.