摘要:
There are disclosed a process for producing an .alpha.-acyloxy-.alpha.,.beta.-unsaturated carbonyl compound represented by the general formula (VI): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.4 are independently hydrogen atoms or substituted or unsubstituted hydrocarbon residues, or R.sub.1, R.sub.2 and R.sub.4, when taken together with one another in an optional combination, form a ring, R.sub.3 is a substituted or unsubstituted hydrocarbon residue, and indicates that the configuration may be either E-configuration or Z-configuration, in particular, a 20-acyloxy-17(20)-methylen-21-al-steroid represented by the partial structural formula (II): ##STR2##
摘要:
There are disclosed a process for producing an .alpha.-acyloxy-.alpha.,.beta.-unsaturated carbonyl compound represented by the general formula (VI): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.4 are independently hydrogen atoms or substituted or unsubstituted hydrocarbon residues, or R.sub.1 and R.sub.2, when taken together with one another in an optional combination, form a ring, R.sub.3 is a substituted or unsubstituted hydrocarbon residue, and indicates that the configuration may be either E-configuration or Z-configuration, in particular, a 20-acyloxy-17(20)-methylen-21-al-steroid represented by the partial structural formula (II): ##STR2## wherein R is a hydrocarbon residue, and indicates that the configuration of the acyloxy group and the formyl group bonded to the carbon atom at the 20-position may be either E-configuration or Z-configuration, which comprises oxidizing a propargyl ester represented by the general formula (V): ##STR3## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 have the same meanings as defined above; an al-steroid compound having the above partial structural formula which is an intermediate for producing a 21-acyloxy-20-keto-delta.sup.16 -steroid being extremely useful as an intermediate for important corticoids as drugs and obtained by being subjected said al-steroid to isomerization reaction; and a process for producing a 21-acyloxy-20-keto-delta.sup.16 -steroid which comprises oxidation reaction and isomerization reaction.
摘要:
A process for producing alpha,beta-unsaturated ketones represented by the following general formula ##STR1## wherein R.sub.1 represents a hydrocarbon radical, R.sub.2 represents an organic radical bonded through a carbon-carbon bond, R.sub.3 and R.sub.4 represent a hydrogen atom or a hydrocarbon radical, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be straight-chained or form a ring in arbitrary combinations,which comprises contacting an alpha-disubstituted-beta-keto acid ester represented by the general formula ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as defined, and R.sub.5, R.sub.6, R.sub.7 and R.sub.8 represent a hydrogen atom or a hydrocarbon radical,with a catalyst consisting essentially of (a) a compound of a platinum-group metal and optionally (b) a monodentate ligand (b).
摘要:
An electrically conductive elastomer film comprising (i) a thermoplastic elastomer and (ii) 5 to 100 parts by weight, based on 100 parts by weight of the thermoplastic elastomer, of an electrically conductive filler, and having a volume resistance of 0.1 to 5 &OHgr;cm as measured in the direction perpendicular to the film plane. This film is produced by a casting process wherein a releasable base is coated with a solution prepared by dissolving or dispersing 5 to 30 parts by weight of the sum of a thermoplastic elastomer and an electrically conductive filler in 100 parts by weight of an organic solvent; the thus-formed coating is dried; and then the thus-formed film is released from the releasable base.
摘要:
A quadrature type FM demodulator device used, for example, in a television receiver, includes a band pass filter for filtering a sound intermediate frequency (SIF) signal input to the device. The output of the band pass filter is coupled through a filter circuit to an integrated circuit having a limiter amplifier and an FM detector to output a sound signal from the SIF signal.
摘要:
A phenol derivative of the general formula ##STR1## wherein R is a hydrogen atom or an alkyl group containing 1 to 4 carbon atoms, and X and Y, which may be identical or different, each represent a cyclopentyl or cyclohexyl group.
摘要:
A variable resistance gain control integrated circuit has a resistor inserted between the emitters of two transistors serving as a differential pair, and two transistors which serve as an active load and have their emitters connected to the emitters of the two transistors serving as a differential pair. The resistor and the transistors serving as the active load are formed within a single semiconductor island region.
摘要:
A functional liquid for use as a heat transfer medium, anti-freezing liquid, insulating oil or the like, comprising at least one of dicyclopentylalkylbenzenes as the base.
摘要:
Providing a fluorinated hydrocarbon with excellent cleaning action, incombustibility and high stability in alkali or water and heat; and a polymer-containing solution prepared by dissolving or dispersing a polymer with film-forming potency, preferably a fluoropolymer, in a solvent containing trihydrofluorocarbon. More specifically, a fluorinated hydrocarbon containing trihydrofluorocarbon with 4 to 6 carbon atoms at 95% or more, as represented by the following formula, is provided, together with a polymer-containing solution containing the same: Rf1—R1—Rf2 (I) wherein R1 represents a carbon chain of CHF and CH2, bound to each other; Rf1 and Rf2 independently represent a perfluoroalkyl group; and Rf1 and Rf2 may be bound to each other, to form a ring.
摘要:
There is provided a lubricating polymer-containing liquid which comprises a film-forming lubricating polymer, preferably a fluoropolymer, and a liquid medium predominantly comprised of cyclic hydrofluorocarbon wherein said lubricating polymer is dissolved or dispersed. A lubricative polymer film of good performance is formed by coating, for example, a magnetic recording hard disk, an ink jet recording head or a cleaning blade of an image-forming device with the lubricating polymer containing liquid, and then removing the liquid medium.