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Method of producing 1-(2-halogen biphenyl-4-yl)-cyclopropane carboxylic acid derivatives Invention relates to an improved method of producing a compound of formula , comprising the steps: 1) reacting a compound of formula , where X is a fluorine atom, and X1 is selected from a group consisting of chlorine, bromine and iodine atoms and a triflate group (CF3SO3), with a compound of formula , where R denotes two chlorine atoms, in the presence of a palladium catalyst to form a compound of formula ; 2) radical bromination of the compound of formula (IV) with N-bromosuccinimide in the presence of a catalytic amount of benzoyl peroxide to form a compound of formula ; 3) converting the compound of formula (V) to the corresponding nitrile derivative of formula ; 4) reacting the compound of formula (VI) with 1,2-dibromoethane to form a compound of formula ; and 5) hydrolysis of the compound of formula (VII) to obtain a compound of formula (Ia). |
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Method of producing diaryl acetylenes Invention relates to a method of producing diaryl acetylenes of general formula , where R=aryl; R1=aryl, by reacting an organotin compound with aryl iodides in the medium of an organic solvent, in the presence of a catalyst - a palladium (II) complex, characterised by that the organotin compound used is tin tetraalkynylides and the reaction takes place at temperature 60-100°C. |
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4,4'-difluorobenzophenone synthesis method Present invention relates to a method for synthesis of 4,4'-difluorobenzophenone, the main raw product for synthesis of aromatic polyester-ketones. The method involves a first step where fluorobenzene reacts with formaldehyde under conditions for catalysis with organic sulphonic acids to form difluorodiphenylmethane. The product is extracted and oxidised with nitric acid at the second step to 4,4'-difluorobenzophenone. |
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Substituted iron phthalocyanines and method of obtaining chlor-derivatives of aromatic hydrocarbons As catalyst substituted iron phthalocyanines of general formula , |
Another patent 2550927.