Of compounds containing doubly bound oxygen atoms, e.g. esters (C07C45/54)

ethod for alcoxyphenol and alcoxyhydroxybenzaldehyde production // 2628525
FIELD: chemistry.SUBSTANCE: method for alkoxyphenol production comprises O-alkylation of at least one hydroxyphenol to form at least one alkoxyphenol, at that, the said reaction is carried out using an O-alkylating agent, an aqueous solvent containing a Bronsted base and an organic solvent with a base/O-alkylating agent ration in the range of 0.5 to 1.5 moles of base per mole of O-alkylating agent, with an O-alkylating agent/hydroxyphenol ratio in the range of 0.5 to 2 moles of O-alkylating agent per mole of hydroxyphenol and with an organic solvent/hydroxyphenol ratio of less than 280 ml, preferably in the range of 10 to 250 ml and more preferably in the range of 50 to 150 ml of an organic solvent per mole of hydroxyphenol. One of the versions of the alkoxyhydroxybenzaldehyde production method comprises preparation of alkoxyphenol from hydroxyphenol by the foregoing method and a reaction of the aldehyde group addition to the resulting alkoxyphenol to obtain the corresponding alkoxyhydroxybenzaldehyde, preferably by condensation reaction between alkoxyphenol and glyoxylic acid, followed by oxidation of the resulting compound.EFFECT: proposed method for alkoxyphenol production allows the desired product to be obtained in good yield and high purity with high conversion of initial hydroxyphenol.11 cl, 3 dwg, 7 ex

ethod for preparation of 3,3-dimethylbutyraldehyde // 2591703
FIELD: chemistry.SUBSTANCE: invention relates to a method of producing 3.3-dimethylbutyraldehyde, which is used as intermediate compound for producing of sweetener. Method consists in fact that with preliminary cooled dichloromethane one sequentially mixes in tank tert-butyl chloride and vinyl acetate to produce mixture which is held for catalytic reaction in presence of catalyst introduced into mixture, adding deionised water and stirring, after which organic phase is separated and washed with sodium carbonate solution, and then separated from dichloromethane organic phase, drying, condensation and recovery of dichloromethane followed by distillation of organic phase in vacuum and collected fraction of 1-chloro-3.3-dimethylbutylacetate acid is added to it, and obtained mixture is heated to 100 C-110 C for hydrolytic disproportionation in presence of catalyst to obtain a mixture containing 3.3-dimethylbutyraldehyde and subsequent purification of mixture by distillation to obtain purified 3.3-dimethylbutyraldehyde.EFFECT: proposed method allows to produce end product with purity higher than 99, 7 %, and output of 95 % by controlled two-stage reaction using readily available material.10 cl, 1 dwg, 3 ex

ethod for production of fluorinated ketone // 2279422
FIELD: organic chemistry.SUBSTANCE: invention relates to method for production of fluorinated ketone of general formula 5 . Claimed method includes reaction of compound of formula 3 , containing at least 30 wt.% of fluorine with fluorine in liquid phase, containing solvent selected from group comprising perfluoroalkane, perfluorinated ester, perfluorinated polyether, chlorofuorohydrocarbon, chlorofluoropolyether, perfluoroalkylamine, inert liquid, compound of formula 2 , compound of formula 6 to produce compound of formula 4 , followed by dissociation of ester bond in formula 4 in presence of KF, NaF or activated carbon without solvent. In formulae: RA represents, optionally containing ether-forming oxygen atom, wherein each of said groups contains C1-C10 carbon atoms; RAF represents C1-C10-perfluorenated RA group; RB represents alkyl optionally containing ether-forming oxygen atom, partially halogenated alkyl, optionally containing ether-forming oxygen atom, wherein each of said groups contains C1-C10 carbon atoms; RBF represents C1-C10-perfluorenated RB group; RC and RCF groups are identical ones and each RC and RCF contains C2-C10 carbon atoms and represents perfluorenated alkyl optionally containing ether-forming oxygen atom, partially halogenated alkyl, optionally containing ether-forming oxygen atom or RA and RB together form alkylene group optionally containing ether-forming oxygen atom, partially halogenated alkylene, optionally containing ether-forming oxygen atom, wherein each abovementioned group contains C3-C6 carbon atoms; each RAF and RBF are perflurenated RA and RB groups containing C3-C6 carbon atoms; groups are identical ones and each RC and RCF contains C2-C10 carbon atoms and represents perfluorenated alkyl optionally containing ether-forming oxygen atom, partially halogenated alkyl, optionally containing ether-forming oxygen atom. Method of present invention provides fluorinated ketone production with 71-96 % yield. Some intermediates of formula 3 also are described.EFFECT: method for fluorinated ketone production with increased yield.10 cl, 5 ex

Way to obtain the aryl-substituted acetylization-1,3 // 2218322
The invention relates to a method for producing aryl-substituted acetylization-1,3 formulawhere R= H, Cl, C2H5CH(CH3)2interacting 1,1-diarylethene with dimethylphthalate using xylene in the presence of sodium alcoholate in methanol, which is gradually metered to the original reactants at a temperature of 100-120oWith simultaneous distillation of the mixture of alcohols and xylene, and the process is carried out at a molar ratio of 1,1-dearylation:sodium alcoholate, which is 1: 1,1-1,5, at a temperature 110-128oWith
 
2551310.
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