摘要:
A process is provided for preparing N,N′-carbonyldiazoles by reacting azoles with phosgene in halogenated aliphatic hydrocarbon solvents, the entirety of the azole for reaction being introduced in the solvent, followed by the addition of phosgene.
摘要:
A process is provided for preparing N,N′-carbonyldiazoles by reacting azoles with phosgene in halogenated aliphatic hydrocarbon solvents, the entirety of the azole for reaction being introduced in the solvent, followed by the addition of phosgene.
摘要:
What is described is a process for preparing compounds of the general formula (I) in which R1, R2 and R3 independently of one another represent hydrogen, an alkyl group or an aryl group, wherein compounds of the general formula (II) in which R1 and R2 have the meaning given for formula (I), are reacted with an alkylating agent of the general formula (III) R3X (III), in which X represents a halogen atom and R3 has the meaning given for formula (I), if appropriate in a solvent.
摘要:
Carbonyl compounds of the formula (II), wherein R1 and R2 are as defined herein, react in the presence of an amine with carboxylic acid derivatives of the formula (II), wherein R3 and EWG are also as defined herein, to give α,β-unsaturated compounds of the formula (I) according to the following scheme: It is possible under mild reaction conditions to obtain unsaturated esters with high (E) stereoselectivity. The reaction typically proceeds at room temperature or lower without particular requirements such as inert gas, exclusion of moisture, heat, etc., being made. The only by-products obtained are CO2 and water.
摘要:
What are described are insect- and mite-repellent compositions comprising at least 2 enantiomers selected from the group of 1-[(S)-sec-butyloxycarbonyl]-2-(S)-(2-hydroxyethyl)piperidine (referred to hereinafter as S,S), 1-[(R)-sec-butyloxycarbonyl]-2-(R)-(+)-(2-hydroxyethyl)piperidine (referred to hereinafter as R,R), 1-[(S)-sec-butoxycarbonyl]-2-(R)-(+)-(2-hydroxyethyl)piperidine (referred to hereinafter as S,R), 1-[(R)-sec-butyloxycarbonyl]-2-(S)-(+)-(2-hydroxyethyl)piperidine (referred to hereinafter as R,S), excluding the racemate mixture thereof, a process for preparation thereof and the use thereof in insect- and mite-repellent formulations.
摘要:
The invention relates to an insect- and mite-repelling agent, characterized by a content of at least one substituted, enantiomer-enriched α-,ω-amino alcohol derivative of formula (1) wherein X represents hydrogen, COR11 or R13, R13 represents C1-C6 alkyl, R1 represents C1-C7 alkyl, C3-C7alkenyl or C2-C7 alkinyl, R2 R11, R13 are identical or different and represent C1-C6 alkyl or C2-C7 alkenyl, R3-R8 are identical or different and represent hydrogen or C1-C6 alkyl, wherein R2 and R3 or R3 and R7 or R3 and R5 or R5 and R7 can also form, together with the atoms to which they are bonded, a 5- or 6-membered monocycle ring. Also disclosed is a method for producing said agent.
摘要:
What is described is a process for preparing compounds of the general formula (I) in which R1, R2 and R3 independently of one another represent hydrogen, an alkyl group or an aryl group, wherein compounds of the general formula (II) in which R1 and R2 have the meaning given for formula (I), are reacted with an alkylating agent of the general formula (III) R3X (III) in which X represents a halogen atom and R3 has the meaning given for formula (I), if appropriate in a solvent.
摘要:
An improved process for preparing menthylamides is provided by reacting menthyl halides with magnesium or lithium and subsequent reaction with an isocyanate, a heterocycle or a carbamoyl chloride.
摘要:
The invention relates to a method for largely eliminating chlorine compounds from organic isocyanates or isocyanate mixtures by contacting said isocyanates or isocyanate mixtures with a water-containing inert gas flow or an organic material having a cation-exchanging effect. The inventive method allows the isocyanates to be gently freed from chorine-containing compounds and is particularly suitable for temperature-sensitive isocyanates.