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7427370 |
The invention relates to a method for producing Grignard compounds, according to which magnesium is reacted in a suitable fluid reaction medium in a protective atmosphere with hologen-substituted organic compounds by means of microwave r...
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7387751 |
The present invention is directed to a reagent for use in the preparation of organomagnesium compounds as well as to a method of preparing such organomagnesium compounds. The present invention furthermore provides a method of preparing f...
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7384580 |
The present invention is directed to a reagent for use in the preparation of organomagnesium compounds as well as to a method of preparing such organomagnesium compounds. The present invention furthermore provides a method of preparing f...
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7311759 |
A two-stage process is provided for purifying off-gases from a high-pressure melamine plant. In the first stage, the off-gases are contacted with a recirculated urea melt containing melamine precursors and NH 3 . In the second stage, the...
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7208627 |
In the process of synthesizing alkylborazine compound represented by the chemical formula 2, by a reaction of a halogenated borazine compound represented by the chemical formula 1 with a Grignard reagent, thus synthesized alkylborazine c...
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6899830 |
The invention relates to a process for preparing Grignard compounds of the formula I. The invention additionally relates to compounds of the formula I and to polymer-bound compounds of the formula Ia. The invention further relates to the...
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6861011 |
Methyllithium is prepared by reacting chloromethane with a dispersion lithium metal in an aromatic organic solvent with methyltetrahydrofuran.
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6814895 |
The present invention is concerned with a novel process for the preparation of 1-(3,5-bis(trifluoromethyl)phenyl)ethan-1-one (CAS 30071-93-3). This compound is useful as an intermediate in the synthesis of therapeutic agents.
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6749778 |
A process for the preparation of organomagnesium compounds from organic halides and magnesium metal in the presence of transition metal catalysts using an activity-enhancing main group metal component. The latter is a compound of a metal...
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6552237 |
A Grignard-type process for the preparation of unsaturated organic compounds. The process comprises contacting an unsaturated organic halide with magnesium metal in a mixture of ether and a polar halogenated hydrocarbon co-solvent, filte...
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6541651 |
Processes for the preparation of phenyl Grignard reagents in co-solvents of toluene and ether and, the preparation of phenylchlorosilane intermediates using co-solvents of toluene and ether essentially in a one step process. The phenylch...
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6455718 |
Chloropentafluorobenzene or bromopentafluorobenzene is formed by heating perhalobenzene, C 6 F n X 6-n where n is 0 to 4, and each X is, independently, a chlorine or bromine atom, with alkali metal fluoride, and an aminophosphonium cata...
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6432326 |
A process for the stereoselective preparation of Grignard compounds of the formula I and polymer-bonded compounds of the formula Ia is described. The process can be used for producing substance reference libraries and the compounds of th...
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6303057 |
The process of invention reacts an alkynyl halide with a mixture that includes a dialkylaminomagnesium halide or a bis(dialkylamino)magnesium compound to produce a cycloalkylacetylene compound. Preferably, the dialkylaminomagnesium halid...
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6296788 |
Grignard reagents which contain a protected aldehyde function are obtained in a particularly advantageous manner from a halogenated aldehyde by reaction with a secondary monoamine to give an open-chain aminal, and conversion of the latte...
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6274068 |
A method for the preparation of 2-hydroxyarylaldehydes from an aryloxy magnesium compound and formaldehyde, which comprises reacting at a temperature from 40-120° C., an aryloxy magnesium compound having an aryloxy anion and a non-arylo...
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6248265 |
Fluoroaryl Grignard reagents are produced from a hydrocarbyl Grignard reagent and fluoroaromatic compounds via separate additions of different fluoroaromatic compounds, such that the conversion of hydrocarbyl Grignard reagent to the desi...
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6241917 |
Chloropentafluorobenzene or bromopentafluorobenzene is formed by heating perhalobenzene, C 6 F n X 6 -n where n is 0 to 4, and each X is, independently, a chlorine or bromine atom, with alkali metal fluoride, and an aminophosphonium ca...
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6235222 |
In order to provide a method of safely, efficiently, and industrially manufacturing fluoroaryl magnesium halide containing no impurities, such as coloring components, by a relatively gradual reaction compared with the conventional reacti...
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6231790 |
Pentafluorophenyl Grignard reagents are reacted with a boron trihalide in a non-ethereal solvent such as toluene to produce a tetrakis pentafluorophenyl borate magnesium halide.
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6221285 |
The preparation of organomagnesium compounds from organic halides, especially aromatic chloro compounds, and magnesium metal in the presence of a transition metal compound as a catalyst.
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6197089 |
The invention relates to activated magnesium metal, to a method of activating magnesium metal and to its use for the preparation of organomagnesium compounds. The activated magnesium metal is obtainable by reacting molten magnesium metal...
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6175027 |
A method for producing an alkyl cyclopentadiene by reacting cyclopentadienyl Grignard with an alkyl halide and for converting the alkyl cyclopentadiene to a bis(n-alkyl cyclopentadienyl) Group IV metal dihalide is described.
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6129863 |
Perfluoroaryl Grignard reagents are produced from a hydrocarbyl Grignard reagent and polyhaloaromatic compounds via separate additions of different polyhaloaromatic compounds, such that the conversion of hydrocarbyl Grignard reagent to t...
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6117372 |
Grignard compounds from aromatic chlorine compounds and magnesium metal in the presence of a transition metal/magnesium chloride complex as a catalyst.
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6080888 |
Arylolefinic compounds are prepared by reacting aryl halide with an olefinic compound in the presence of a polar liquid reaction medium containing (a) secondary or tertiary amine as a hydrogen halide acceptor (b) a catalyst system formed...
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6057480 |
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6054628 |
In a process for carrying out an exothermal reaction, selected from the addition reaction of organomagnesium halide compounds to carbonyl compounds and the ensuing hydrolysis of the addition product, a considerable fraction of the heat l...
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5910605 |
The invention relates to a process for the preparation of 3-hydroxy-2-methylbenzoic acid and 3-acetoxy-2-methylbenzoic acid, which comprises reacting 3-chloro-2-methylphenol (3) with benzyl chloride to give 2-benzyloxy-6-chlorotoluene (4...
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5852216 |
A method of preparing (3-alkoxyphenyl)magnesium chlorides and the use thereof for reaction with certain carbonyl compounds are described.
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5831106 |
A process for preparing metallocene complexes of the general ##STR1## in which the substituents have the following meanings: M is titanium, zirconium, hafnium, vanadium, niobium or tantalum, X is fluorine, chlorine, bromine, iodine...
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5792886 |
In producing (±)-2-(6-methoxy-2-naphthyl)propionic acid or precursor thereof from 2-bromo-6-methoxynaphthalene, use is made of 2-bromo-6-methoxynaphthalene formed by (a) methylating 6-bromo-2-naphthol with methyl chloride in a solvent c...
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5779942 |
This dialkylmagnesium is represented by the formula R--(CH 2 --CH 2 ) n --Mg--(CH 2 --CH 2 ) n ' --R', (E--O--E') x , where R and R' each independently represent a C 1 -C 20 hydrocarbon residue, branched or not, substituted or not, ...
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5744071 |
The present invention provides processes for making alkynyl ketones and precursors thereof, using less expensive reagents and/or hydrocarbon solvents and/or higher temperatures.
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5693261 |
Pentafluorophenylmagnesium halides are prepared by a Grignard exchange reaction of hydrocarbylmagnesium halide with pentafluorochlorobenzene. The pentafluorophenylmagnesium halides are converted to pentafluorophenyl metal or metalloid de...
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5474716 |
Disclosed are processes for the preparation of new bridged cyclopentadienylmagnesium compounds of the general formula Q(CpR a )(Cp'R' a ')Mg, and the use thereof for preparing bridged metallocenes.
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5453221 |
Disclosed are new bridged cyclopentadienylmagnesium compounds of the general formula Q(CpR a ) (Cp'R' a ')Mg, processes for the preparation thereof, and the use thereof for preparing bridged metallocenes.
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5362423 |
Disclosed is a production method, wherein, with pentafluorobenzene represented by C 6 HF 5 , 0.5 to 1.5 equivalents of organometallic compound represented by a general formula R 2 -n MgXn (wherein n denotes a real number of 0 or 1, X ...
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5358670 |
This invention relates to an alkyl Grignard reagents in diethylene glycol dibutyl ether. The invention also relates to a novel method for preparing Grignard reagents comprising reacting an alkyl halide with magnesium metal in the presenc...
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5273686 |
Organic-solvent soluble magnesium hydrides or formulas ##STR1## are prepared by catalytically hydrogenating finely powdered magnesium, optionally in the presence of a magnesium halide, in an organic solvent in the presence of their MgH 2...
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5242625 |
Process for the preparation of compounds of formula (I): Y--Mg--X (I) wherein Y is allyl, or an optionally substituted phenyl or optionally substituted benzyl group, and X is a halogen,...
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5209459 |
Process for the preparation of compounds of formula (I): Y--Mg--X (I) wherein Y is an optionally substituted phenyl or benzyl, and X is a halogen, by reaction of a compound of formula (...
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5171847 |
Novel metallo-organic complexes of the formula (M x X z . nL)y where M is an alkaline earth metal, a transition metal(at. Nos. 21-30, 39-48 and 72-80 inclusive) or a rare earth metal (at. Nos. 57-71 inclusive), X is an anion e.g. Cl - ,...
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5157149 |
A method of making substantially pure L-BPA is disclosed. The method includes the steps of reacting 4-bromobenzaldehyde with ethylene glycol to form 4-bromobenzaldehyde ethylene glycol acetal, sequentially reacting 4-bromobenzaldehyde et...
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5146001 |
In the preparation of benzyl ketones of the formula ##STR1## a benzyl chloride of the formula ##STR2## is reacted with an acid chloride of the formula R 6 --CO--Cl (III) a) in a first stage...
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5141676 |
Organic-solvent soluble magnesium hydrides of the formulas (MgH 2 ) n . MgQ 2 (II) (MgH 2 ) n . RMgX (III) ##STR1## are prepared by catalytically hydrogenating finely ...
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5109043 |
A process for the preparation of organophosphorus derivatives of 2,4-di-tert-butylphenol with a high proportion of organophosphorus derivatives of biphenyl, which comprises reacting, in a first step, a 4,4'-dihalobiphenyl whose halogen h...
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5104997 |
This invention provides a process for deacidifying paper by contacting the paper with hydrocarbon or halocarbon solutions of certain magnesium and/or zinc alkoxyalkoxides which may have been treated with carbon dioxide to yield low visco...
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5099040 |
A new process for the preparation of 1-chloro-2-(1-chloro-cyclopropyl)-3-(2-chloro-phenyl)-propan
-2-ol of the formula ##STR1## and/or 2-(1-chloro-cyclopropyl)-2-(2-chloro-benzyl)-oxirane of the formula ##STR2## comprising a) reacting in...
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5093046 |
Ethereal solutions of arylmethylmagnesium halides Ar--CH 2 --Mg--Hal I (where Ar is unsubstituted or substituted aryl and Hal is Cl or Br) are prepared by the Grignard method from an arylmethyl hali...
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