Abstract:
Novel antihypertensive and coronary dilating asymmetric diesters of 1,4-dihydro-2,6-dimethyl-pyridine-3,5-dicarboxylic acid (or the stereoisomers or pharmaceutically acceptable acid addition salts thereof) have the general formula (I): ##STR1## wherein Ph is phenyl, Ar is 2-nitrophenyl, 3-nitrophenyl, 2,3-dichlorophenyl or benzofurazan-4-yl, A is a straight or branched chain alkylene radical having from 2 to 6 carbon atoms, R is a straight or branched chain alkyl radical having from 1 to 6 carbon atoms, optionally mono-substituted by an alkoxy substituent having from 1 to 6 carbon atoms, R.sub.1 is hydrogen, hydroxy or an alkyl radical having from 1 to 4 carbon atoms, and R.sub.2 is hydrogen or methyl. The subject diesters are facilely prepared from the aldehydes ArCHO and esters of acetoacetic and 3-aminocrotonic acids.
Abstract:
2,4-Dinitrophenyl ethers are prepared by reacting a 2,4-dinitrochlorobenzene or 2,4-dinitrobromobenzene with an alkali metal alcoholate in a non-polar, inert solvent, at a temperature from -25.degree. C. to 50.degree. C.
Abstract:
2,4-Dichloro-3-alkyl-6-nitrophenols are prepared by chlorinating, with chlorine in the presence of a catalyst, 1-alkyl-4-nitrobenzenes having a C.sub.2 -C.sub.8 -alkyl radical until the content of trichloroalkylnitrobenzenes is at least 60% by weight in the chlorination mixture, removing the catalyst from the chlorination mixture, then hydrolyzing the chlorination mixture, removing the precipitated reaction product, and treating it with an aqueous inorganic acid. The 2,4-dichloro-3-alkyl-6-nitrophenols are new.
Abstract:
A heat developable light-sensitive material containing a compound represented by the general formula (I):[Ar.sub.n (R).sub.3-n CCO.sub.2 H].sub.l .multidot.B.sub.m (I)wherein ar represents an aryl group or a heterocyclic group; R represents a substituent other than an aryl group and a heterocyclic group; Ar and R may be bonded in a part thereof to form a ring; B represents a mono- or diacidic base which has a pKa of 7 or more and contains 12 or less carbon atoms; n represents an integer from 1 to 3; l and m each represents an integer of 1 or 2 and maintain a relationship in that a number of positive charge and a number of negative charge are equal; when n represents 1 or 2, two R's or Ar's may be the same or different, when n represents 3, three Ar's may be the same or different; and the substituent represented by Ar or R may be further substituted with a substituent. The compound represented by the general formula (I) is a base precursor which is stable at normal temperature but rapidly decomposes to release a base by heating and therefore the heat developable light-sensitive material containing the base precursor has excellent preservability and provides images having good image quality, i.e., low fog density and high image density upon a short period of developing time.
Abstract:
The invention concerns the manufacture of nitromethane by nitration of mene in a homogeneous gaseous phase, the nitrating agent being nitric acid, nitrogen peroxide or mixtures thereof. According to the disclosed process, the molar ratio methane/nitrating agent is between 0.1 and 5; the reaction contact time between 0.1 and 120 seconds; the reaction pressure between 1 and 35 bars; the temperature between 270.degree. and 600.degree. C. The nitration is carried out in the presence of an active agent of the halogen or derivative type introduced in a molar ratio at the most equal to 3. An installation is disclosed for industrially manufacturing nitromethane.
Abstract:
New benzo-1,4-quinones and salts thereof with organic or inorganic acid and bases have the formula I ##STR1## wherein p is 1 or 2 and q is 0 or 1, provided that p+q is 1 or 2, R is a residue of formula II ##STR2## wherein Q is selected from the residues --CO.sub.2 R.sub.4, --CON(R.sub.4)(R.sub.5), --OR.sub.5, --OCOR.sub.7, --N(R.sub.8)(R.sub.9), --PO(OR.sub.10)([O].sub.x R.sub.11), --SO.sub.2 R.sub.12, --CN, Halogen, --NO.sub.2 or --COR.sub.13, n is an integer from 1 to 20, k is 1 or 2 and x is 0 or 1, and R.sub.1 to R.sub.5 and R.sub.7 to R.sub.13 are as defined in the specification.The compounds of formula I are useful in photographic materials such as bleaching inhibitors in films of photographic silver dye bleach materials.
Abstract translation:新的苯并-1,4-醌及其与有机或无机酸和碱的盐具有式I(I)其中p为1或2,q为0或1,条件是p + q为1或2 R为残基-CO 2 R 4,-CON(R 4)(R 5),-OR 5,-OCOR 7,-N(R 8)(R 9),-PO (OR 10)([O] x R 11),-SO 2 R 12,-CN,卤素,-NO 2或-COR 13,n为1至20的整数,k为1或2,x为0或1,R1至R5和 R7至R13如说明书中所定义。 式I化合物可用于照相材料,如照相银染料漂白材料的薄膜中的漂白抑制剂。
Abstract:
A process for the preparation of a phenylglyocylic acid ester of the formula ##STR1## wherein R.sup.1 represents alkyl,X represents halogen, alkyl, halogenoalkyl, alkoxy or nitro, andn represents 0, 1, 2, or 3by contacting a benzoyl cyanide of the formula ##STR2## wherein X and n have the meanings stated above, in a sulphuric acid/water system in the presence of chloride ions at a temperature between 0.degree. and 70.degree. C. to form phenylglyoxylic acid amide and reacting the phenylglyoxylic acid amide without isolation with an alcohol of the formula R.sup.1 -OH, wherein R.sup.1 has the meaning stated above, optionally in the presence of a diluent, at a temperature between 40.degree. and 100.degree. C.
Abstract:
Substituted phenols of formula ##STR1## in which R.sub.1 is in an ortho or para position relative to the phenol function and denotes ##STR2## R.sub.2 denotes an acyclic radical optionally substituted by alkyl, hydroxy, alkoxycarbonyl, cyano or formyl, or a phenyl or naphthyl radical, and R denotes hydrogen or 1 to 4 substituents chosen from halogen, OH optionally in the form of ether or ester, alkyl, NO.sub.2, CHO optionally in the form of acetal, CH.sub.3 CO--, C.sub.6 H.sub.5 CO--, NH.sub.2, alkylamino, dialkylamino or alkoxycarbonyl, it being understood that 2 symbols R may form with the phenyl nucleus a condensed aromatic ring, which comprises reacting a butadiene of formula ##STR3## with a phenol for formula ##STR4## in water in the presence of a rhodium-based catalyst, a water-soluble phosphine and optionally an inorganic or organic base. The products of formula (I) are intermediates for the synthesis of vitamin E, antioxidants, perfumes or insecticides.
Abstract:
Disclosure herein is novel oxalic acid ester derivatives represented by the general formula: ##STR1## wherein either one of X and Y represents a nitro group, and the other represents ##STR2## in which R represents a lower alkyl group, and n represents a figure of 1-50. The oxalic acid ester derivatives are useful as chemiluminescent reagents for fluororescent substances.
Abstract:
The invention is a process for the preparation of an aromatic hydrocarbon with a cyclobutene ring fused to the aromatic hydrocarbon which comprises, dissolving an ortho alkyl halomethyl aromatic hydrocarbon in an inert solvent and pyrolyzing the solution of ortho alkyl halomethyl aromatic hydrocarbon in the inert solvent under conditions such that the ortho alkyl and halomethyl substituents form a cyclobutene ring thereby forming an aromatic hydrocarbon having a fused cyclobutene ring.