摘要:
A process for separating a cis isomer from a mixture of the cis isomer and a trans isomer of an azolylmethylcyclopentanol derivative of the formula (I): ##STR1## wherein, R.sup.1 and R.sup.2 each independently represent a hydrogen atom or an alkyl group; each X represents a halogen atom, an alkyl group, a haloalkyl group, a phenyl group, a cyano group or a nitro group; n is an integer of from 0 to 5; A represents a nitrogen atom or a CH group; and each X may be identical or different when n is an integer of from 2 to 5, comprising the steps of dehydrating selectively the trans isomer in the presence of an acid and isolating the cis isomer.
摘要:
This disclosure describes an inclusion compound of cyclodextrin in which at least one guest compound selected from the group of eicosapentaenoic acid, docosahexaenoic acid and alkali metal salts and alkyl esters thereof is included.
摘要:
Disclosed herein are the novel 6-substituted naphthalene-2-carboxylic acids represented by the formula (I): ##STR1## wherein X represents a hydroperoxy group or a hydroxy group, and a process for producing the 6-substituted naphthalene-2-carboxylic acid represented by the formula (I) by reacting 6-isopropylnaphthalene-2-carboxylic acid with molecular oxygen under heating in the presence of a salt of persulfuric acid as a catalyst in an aqueous alkaline solution.
摘要:
Biphenyl-4,4'-dicarboxylic acid is prepared by isolating a mixture of diisopropylbiphenyls from a reaction mixture obtained by reacting biphenyl with propylene, crystallizing 4,4'-diisopropylbiphenyl from the mixture of diisopropylbiphenyls, and oxidizing 4,4'-diisopropylbiphenyl or an oxidation intermediate thereof with molecular oxygen in the presence of an oxidation catalyst, which comprises a cobalt catalyst and/or manganese catalyst, in a solvent containing at least 50 wt. % of an aliphatic mono- carboxylic acid having up to 3 carbon atoms.
摘要:
Disclosed herein is a process for producing 2,6-naphthalenedicarboxylic acid together with trimellitic acid comprising oxidizing 2,6-diisopropylnaphthalene with molecular oxygen in the presence of a catalyst comprising a heavy metal(s) and bromine.
摘要:
An input/output unit includes: input/output subunits each including an input/output card that has front-side connectors, which are engaged with back-unit connectors on a back unit of a control device, mounted on a front edge of a substrate and has mounted on a rear edge of the substrate, rear-side connectors to be engaged with connectors of field devices and a card holder that has at a front side, guide shafts to be inserted into guide holes of the back unit and holds the input/output card; and a case which is formed with slots into which the input/output subunits are inserted with a gap, which is formed on a front plate with a long hole into which the back-unit connectors are inserted with a gap and with shaft holes through which the guide shafts are penetrated from inside with a gap, and which is attached to the back unit.
摘要:
Disclosed herein is a process for producing a highly pure produce of 2,6-naphthalenedicarboxylic acid in a large quantity at a moderate price by oxidizing 2,6-diisopropylnaphthalene while using a water-soluble salt of cobalt, a water-soluble salt of maganese or a mixture thereof, a water-soluble salt of cerium and a bromine compound as the catalyst of the oxidation.
摘要:
Disclosed herein is a process for producing i-brassicasterol, comprising charging a mixture of i-sterols derived from a mixture of sterols including brassicasterol into a column packed with a filler obtained by chemically binding alkyl group(s) of 15 to 24 carbon atoms to silica, and subjecting said mixture of i-sterols to reversed-phase partition column-chromatography while using (i) an alcohol of one to three carbon atoms or a mixture therof, or (ii) a mixed solvent comprising more than 50% by volume of said alcohol(s) and a solvent other than said alcohol(s) as an eluent, thereby isolating and purifying i-brassicasterol.
摘要:
A substrate for liquid chromatography comprising a spherical particle of highly cross-linked polymer which is produced from (a) 100 parts by weight of a monomer of vinyl ester, acrylate or methacrylate, these esters having a long alkyl chain, if desired, together with a comonomer copolymerizable with the monomer and (b) 10 to 80 parts by weight of a cross-linking agent copolymerizable with the monomer and having at least two functional groups, and a process for isolating and purifying a fat-soluble substance, for instance, a lower alkyl ester of eicosapentaenoic acid or docosahexaenoic acid by means of the liquid chromatography on the substrate.
摘要:
A speaker apparatus comprises a slit structure, wherein the slit structure including a plurality of plate-shaped parts each of which extends so that a plurality of slits are formed, a plurality of fold-back parts each of which is folded back from an end of the plate-shaped part on the side of the speaker toward a side of the front surface of the housing, so that the plurality of slits are formed, and a drain part that is arranged on a side of one of the two side surfaces of the housing, and wherein each of a plurality of grooves formed by the plurality of plate-shaped parts and the plurality of fold-back parts communicates with the drain part and is inclined so that, in a posture of the slit structure when the operation panel is operated, liquid led from the plate-shaped parts flows to the drain part.