cas 21369-64-2, N-HEXYLLITHIUM | Articles data

Articles about 21369-64-2Total 6 be found

METHOD FOR PRODUCING ALKYL LITHIUM COMPOUNDS AND ARYL LITHIUM COMPOUNDS BY MONITORING THE REACTION BY MEANS OF IR-SPECTROSCOPY
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.
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(2008/06/13)

Method for producing alkyl-bridged ligand systems and transition metal compounds
The invention relates to a method for producing highly substituted alkyl-bridged ligand systems on the basis of indene derivatives and transition metal compounds. Said alkyl-bridged ligand systems can be obtained in high yields using this method.
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(2008/06/13)

Crystalline 10,10-Bis((2-fluoro-4-pyridinyl)methyl)-9(10H)-Anthracenone and an improved process for preparing the same
The present invention relates to processes for the synthesis of a crystalline polymorph of 10,10-Bis((2-fluoro-4-pyridinyl)methyl)-9(10H)-Anthracenone in high purity. The product is useful in the synthesis of pharmaceutical compounds for the reduction of cholinergic system dysfunction.
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(2008/06/13)

Convergent synthesis of alpha -aryl- beta -ketonitriles
The present invention relates to processes for the production of alpha -aryl- beta -ketonitriles, which serve as synthetic intermediates in the preparation of a series of biologically important molecules such as corticotropin releasing factor (CRF) receptor antagonists.
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(2008/06/13)

Method of producing halogenated and alpha-aminoalchohols
A process for the manufacture of N-protected α-aminoketones and N-protected α-aminoalcohols of the formula STR1 wherein X is halogen, one of Q1 and Q2 is hydrogen and the other is hydroxy or Q1 and Q2 together are oxo, R1 is an amino protecting group and R2 is hydrogen or the characterizing group of an α-aminocarboxylic acid, starting from the corresponding lower alkyl N-protected α-aminocarboxylates via corresponding lower alkyl N-silyl protected α-aminocarboxylates.
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(2008/06/13)

Process for the preparation of higher alkenes
A process for the preparation of a straight-chain or branched alkene which has 20 to 24 carbon atoms and in which the ethylenic bond is located after a carbon atom numbered between 8 and 11, which process comprises reacting, in an anhydrous solvent, preferably in an oxahydrocarbon an organometallic copper compound with an alkyl or alkenylsulfonate.
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(2008/06/13)