摘要:
A process comprising reacting a 2-methyloxazoline with a 3-methyl-2-buten-1-yl derivative of the formula ##STR1## in which X is halide, sulphonate or phosphate thereby to produce a 2-methyl-3-(3-methyl-2-butenyl)-2-oxazolinium salt of the formula ##STR2## reacting the oxazolinium salt with an alcoholate of the formulaR.sup.5 --O--M (V)in which M is one equivalent of an alkali metal or alkaline earth metal cation, to produce an oxazolidine of the formula ##STR3## pyrolyzing the oxazolidine to produce a 2-methyl-3-(3-methyl-2-butenyl)-oxazolindine of the formula ##STR4## and heating the 2-methylene-3-(3-methyl-2-butenyl)-oxazolidine to produce a 2-(2,2-dimethyl-3-buten-1-yl)-2-oxazoline.
摘要:
Aliphatic, araliphatic or aromatic nitriles of the formula R--CN are obtained by reacting N-substituted formamides of the formula R--NHCHO with at least the stoichiometric quantity of an acylating agent (generally a carboxylic acid anhydride, such as acetic anhydride, or ketene) in the gas phase at temperatures above 250.degree. C., without using a catalyst. The process is especially useful in the preparation of nitriles wherein the connecting carbon of R is a tertiary carbon atom. The nitriles are important intermediate products, for example for the preparation of herbicides, surface-active agents and anti-corrosive agents.
摘要:
Process for making 1,1-dihalo-4-methyl-1,3-pentadiene compounds which process comprises reacting a 2-2-dimethyl-3,5,5,5-tetrahelogenopent-1-yl derivative of the formula ##STR1## in which Hal.sup.1 is defined as above,Hal.sup.2 is halogen, andR is hydrogen or alkanoyl of up to 5 carbon atoms with a substance having a basic reaction in a temperature range from 20.degree. to 160.degree. C. Certain intermediates produced in such process can also be used as the initial starting material.
摘要:
Disubstituted-O-[1-fluoro-2-halogeno-ethyl]-phosphoric (phosphonic) acid esters of the formula ##STR1## in which R.sub.1 is alkyl with 1 to 4 carbon atoms optionally substituted by fluorine, chlorine or bromine,R.sub.2 is alkyl or alkoxy each with 1 to 4 carbon atoms and optionally substituted by fluorine, chlorine or bromine, or phenyl optionally substituted by at least one of nitro and halogen,X is chlorine or bromine, andY is hydrogen or fluorine,Which possess insecticidal, acaricidal and nematicidal properties.
摘要:
Stabilizers according to the invention are used for stabilizing synthetic polymers against discoloration and degradation under the effect of visible and/or UV light, heat and/or atmospheric influences.
摘要:
Storable, autocrosslinkable polymers containing N-alkoxymethyl groups are obtained by reacting 5-alkoxymethyl-1,3,4-dioxazol-2-ones with a polymer having an average molecular weight above 600 and an average of more than one Zerewitinoff-active hydrogen atom in the molecule in the presence of a catalytic quantity of at least an alkali metal salt. The new catalysts allow to carry out the reaction at a temperature in the range from 50.degree. to 110.degree. C and guarantee a complete reaction of the reactants into uncrosslinked but autocrosslinkable light-stable end products.
摘要:
4-AMINO-2,2,6,6-TETRAMETHYL PIPERIDINE IS PREPARED BY REACTING PHORONE WITH AMMONIA AND HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATALYST. The reaction is generally carried out at a temperature in the range of from 80.degree. to 200.degree. C and under a pressure of from 80 to 250 atmospheres.
摘要:
The present invention relates to new heterocyclylmethyl-substituted pyrazole derivatives, processes for their preparation and their use as medicaments, in particular as medicaments for treatment of cardiovascular diseases.
摘要:
The present invention relates to a process for preparing ivermectin by selective hydrogenation of avermectin and subsequent removal of the catalyst.
摘要:
The present invention relates to the use of known substituted 2-cyclohexene derivatives in the control of diseases, in particular bacterial infections and mycoses.