摘要:
A process is described for preparing aryllithium compounds by reaction of metallic lithium in an ether-containing solvent with an aryl halide, wherein prior to or at the beginning of the reaction a catalyst is added, the catalyst containing a halogen-free, polynuclear aromatic (aryl catalyst) or consisting of such a compound.
摘要:
A method for preparing lithium amide is described in which in a first method step lithium metal is reacted with ammonia to form lithium bronze and in a second method step the lithium bronze is reacted with a 1,3-diene or an arylolefin in the presence of a solvent.
摘要:
A process is described for preparing aryllithium compounds by reaction of metallic lithium in an ether-containing solvent with an aryl halide, wherein prior to or at the beginning of the reaction a catalyst is added, the catalyst containing a halogen-free, polynuclear aromatic (aryl catalyst) or consisting of such a compound.
摘要:
A process is described for preparing aryllithium compounds by reaction of metallic lithium in an ether-containing solvent with an aryl halide, wherein prior to or at the beginning of the reaction a catalyst is added, the catalyst containing a halogen-free, polynuclear aromatic (aryl catalyst) or consisting of such a compound.
摘要:
Concentrated, stable solutions of alkali metal alkoxides ROM, which consist of an alkali metal cation and a secondary or tertiary alcohol residue, in aprotic solvents are described, wherein, relative to alkoxide content, the solutions contain at least 1.0 and at most 15 mol % of alkali metal hydroxide M′OH and at most 1.0 mol % of free alcohol R—OH, wherein R is a secondary or tertiary alkyl residue and wherein M and M′ are mutually independently Li, Na, K, Rb or Cs. A process for the production of the solution and the use thereof are also described.
摘要:
The invention relates to a method for producing alkyl lithium compounds and aryl lithium compounds by reacting lithium metal with alkyl or aryl halogenides in a solvent, the concentration of the alkyl/aryl halogenide and the alkyl/aryl lithium compound being detected according to an in-line measurement in the reactor by means of IR spectroscopy, and an exact recognition of the end point of the dosing of the halogenide constituents being carried out by evaluation of the IR measurement. Said method enables an optimum reactive process and reaction yield. The identification of the respective concentration of the educt and the product is a reliable reactive process. The yield of the reaction is also optimised by determining the end point of the halogenide dosing, as is the purity of the product due to a lower concentration thereof during the reaction.
摘要:
A process is described for the preparation of LiAlH4 solutions, in which lithium hydride reacts with an aluminium halide in diethyl ether to give lithium aluminium hydride, the lithium halide which arises is separated off, and wherein a solvent the complexing energy of which with LiAlH4 is greater than the complexing energy of diethyl ether with LiAlH4 is then added, and the diethyl ether is removed by distillation.
摘要翻译:描述了制备LiAlH 4 O 4溶液的方法,其中氢化锂与二乙醚中的卤化铝反应得到氢化铝锂,产生的卤化锂被分离出,其中溶剂 其中与LiAlH 4 Si的络合能量大于二乙醚与LiAlH 4 S的络合能,然后通过蒸馏除去二乙醚。
摘要:
A process for direct hydroliquefaction of biomass selected from algae, lignocellulosic biomass and/or of one or more constituents of lignocellulosic biomass selected from the group comprising cellulose, hemicellulose and/or lignin for producing fuel bases comprising two successive hydroconversion stages under high hydrogen pressure in ebullating bed reactors. Hydroconversion takes place in the presence of a supported catalyst of the type for hydroconversion of petroleum residue and a suspension composed of the biomass and a solvent, preferably a hydrogen donor solvent and preferably recycled from the process. The biomass can undergo a pretreatment of drying and/or roasting and/or grinding and/or demineralization prior to hydroliquefaction.
摘要:
This patent describes a solution of ethyllithium in dibutyl ether, a non-pyrophoric solution of ethyllithium in dibutyl ether in a concentration of 7 to 8%, a non-pyrophoric solution of ethyllithium in dibutyl ether and in a hydrocarbon in a concentration of 2 to 8%, process for preparing the solutions and the use of the solutions.