摘要:
5-Arylidene hydantoins are produced by condensation of an aromatic aldehyde with hydantoin in the presence of at least one ammonium salt of an aliphatic or aromatic carboxylic acid. The desired 5-arylidene hydantoins are obtained in high yields.
摘要:
There are prepared compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 are hydrogen or together represent a second bond between the carbon atom carrying R.sub.1 and R.sub.2, R.sub.1 also can be a hydroxy group, R.sub.3 is hydrogen, a C.sub.3 -C.sub.8 cycloalkyl group or a C.sub.1 -C.sub.20 alkyl group, which optionally can also contain one or two hydroxy groups and the groups R.sub.4, R.sub.5, R.sub.6 and R.sub.7 are the same or different and are hydrogen, C.sub.1 -C.sub.6 -alkyl groups or halogen atoms, their N-oxide, their quaternary salts and their acid addition salts. There are also described processes for their production. The compounds possess especially an antischemic and blood pressure increasing activity.
摘要:
Compounds are prepared of the formula ##STR1## where R' is a t-alkyl group having 4 to 18 carbon atoms, preferably t-butyl, t-amyl or t-octyl and R is a straight or branched chain alkyl group with 1 to 18 carbon atoms, preferably 1 to 10 carbon atoms or an alkyl group substituted with one or more phenyl group or a halogen atom, particularly a chlorine atom, or a cycloalkyl group with 3 to 8 carbon atoms, particularly cyclopropyl, which can be substituted by one or more 1 to 3 carbon atom alkyl groups or one or more halogen atoms, preferably chlorine, or phenyl or naphthyl or a five membered heterocyclic group or such phenyl, naphthyl or heterocyclic group substituted by halogen atoms, nitro groups, alkyl or alkoxy with 1 to 5 carbon atoms by condensing in acid medium an acyl cyanide of the formulaR--CO--CN (II)where R is as defined above with either(a) a tertiary alcohol of the formulaHO--R' (III) in which R' is as defined above, or preferably(b) an alkene of the formula ##STR2## where R.sub.1 and R.sub.2 are the same or different and are hydrogen or an alkyl group and wherein R.sub.3 and R.sub.4 are the same or different and wherein the alkyl groups in each case can be 1 to 15 carbon atoms. Some of the compounds are new. They are useful as intermediates for synthesizing herbicides and can be used directly as fungicides.
摘要:
Very pure carboxylic acid-1-monoglycerides are prepared by reacting a carboxylic acid with glycidol at a temperature of 80.degree. to 200.degree. C. in the presence of a basic alkali metal or alkaline earth metal compound as a catalyst in the presence of an inert solvent which forms a homogeneous solution with the reactants at the reaction temperature.
摘要:
The novel compounds of formula I: (A, B, R1, R2, R3, X and m are defined in the specification) show selective herbicidal activity. The new compounds can be prepared according to known methods and can be used as herbicides in agriculture and related fields.
摘要:
Herbicidal 2-(hetero)aryloxy-6-arylpyridines and 2-Aryl-4-(hetero)aryloxypyrimidinesNew herbicidal pyridine and pyrimidine derivatives of general formula (1), ##STR1## wherein Z represents a nitrogen atom or a C--H group; A represents an optionally substituted aryl group or an optionally substituted 5- or 6-membered nitrogen-containing heteroaromatic group; n represents an integer from 0 to 2 and R.sup.1 or each R.sup.1 independently represents a hydrogen atom or an optionally substituted alkyl, alkoxy, alkylthio or dialkylamino group; m represents an integer from 0 to 5 and R.sup.1 or each R.sup.1 independently represents a hydrogen or a halogen atom or an optionally substituted alkyl, haloalkyl, haloalkoxy, alkoxy, alkylthio group or a nitro, cyano or a halosulphonyl group; and X represents an oxygen or sulphur atom.
摘要:
New herbicidal pyrimidine derivatives of general formula (I), ##STR1## wherein Z represents a nitrogen atom; A represents a substituted aryl group or an optionally substituted pyridyl or pyrazolyl group; n represents an integer from 0 to 2 and R.sup.1 or each R.sup.1 independently represents a hydrogen atom or an optionally substituted alkyl, alkoxy, alkylthio or dialkylamino group; m represents an integer from 0 to 5 and R.sup.2 or each R.sup.2 independently represents a hydrogen or a halogen atom or an optionally substituted alkyl, haloalkyl, haloalkoxy, alkoxy, alkylthio group or a nitro, cyano or a halosulphonyl group; and X represents an oxygen or sulphur atom.
摘要:
An improved method of preparing 1,6-di(N.sup.3 -cyano-N.sup.1 -guanidino) hexane from alkali dicyanamide and a hexamethylene diammonium salt in alcoholic solution or suspension. The reaction is carried out in the presence of a limited amount of water and of a catalytic amount of a base, preferably a tertiary amine. The pH of the reaction mixture at the start of the reaction is 8 to 10. After the reaction is over, the reaction mixture is compounded with water at a temperature above 80.degree. C. and the coarse product which crystallizes out is separated from the liquid phase.Preferably, sodium dicyanamide and hexamethylene diamine dihydrochloride, preferably formed in situ from aqueous 1,6-diaminohexane and aqueous hydrochloric acid, are reacted at pH 9-9.5 in n-butanol in the presence of 0.1 to 20% by wt. water in relation to the solvent including water.1,6-di(N.sup.3 -cyano-N.sup.1 -guanidino) hexane is obtained in a high yield (85-86%) and with great purity (95-97%) and with a considerably improved space-time yield.
摘要:
L-amino acids present in cleavage solutions obtained in the acylase-catalyzed cleavage of N-acetyl-D,L-amino acids are isolated by use of a strongly acidic ion exchanger in H+ form. First, the mother liquor from a previous treatment cycle is fed to the ion exchanger, and then the cleavage solution and finally the wash water and the discharge from the ion exchanger which is pH-controlled is analyzed into an "effluent water fraction", an "N-acetyl-D-amino acid fraction" and an "L-amino acid fraction". The last fraction is adjusted by addition of fresh cleavage solution to a pH of between 4.0 and 6.0, and from the mixture which is thus obtained the L-amino acid is isolated by crystallization. The mother liquor which is obtained is recycled back into a subsequent treatment cycle.
摘要:
3-oxonitriles are produced by reaction of carboxylic acid esters with carboxylic acid nitriles in the presence of 70 to 80% suspension of sodium hydride in white oil. The oxonitrile are intermediate products for the production of 3-oxocarboxylic acid amides or esters and pesticides.