(C07C47/546)

ethod for obtaining 4,4'-diformyldiphenylalkane // 2575126
FIELD: chemistry.SUBSTANCE: claimed invention relates to method for obtaining 4,4'-diformyldiphenylalkane, represented by means of the following formula (2), which is suitable as different industrial chemical initial substances and in production of initial substances for medications, agrochemicals, optic and electronic functional materials. Method includes formylation of diphenylalkane, represented by means of the following formula (1), with carbon monoxide in presence of fluorohydrogen and boron trifluoride, in which temperature of formylation reaction constitutes from -50 to 5C, from 5 to 30 mol of fluorohydrogen are used per 1 mol of diphenylalkane and from 1.5 to 5 mol of boron trifluoride are used per 1 mol of diphenylalkane: in which R represents alkanediyl group, containing from 1 to 6 carbon atoms, in which R represents alkanediyl group, containing from 1 to 6 carbon atoms.EFFECT: claimed method makes it possible to obtain target products with high degree of purity and with high output.6 cl, 1 tbl, 8 ex

4-(4-alkylcyclohexyl)benzaldehyde // 2446141
FIELD: chemistry.SUBSTANCE: present invention relates to a method of producing 4-(4-alkylcyclohexyl)benzaldehyde or 4-(cyclohexyl)benzaldehyde, which can be used in chemical products used in materials for electronic equipment, including liquid crystals, and for pharmaceutical and agrochemical application. The invention also relates to versions of a method of producing 4-(trans-4-alkylcyclohexyl)benzaldehyde and a method of producing (trans-4-alkylcyclohexyl)benzene. The method of producing 4-(4-alkylcyclohexyl)benzaldehyde or 4-(cyclohexyl)benzaldehyde involves formylation of a benzene derivative of formula (1a) with carbon monoxide in the presence of hydrogen fluoride and boron trifluoride where R1 denotes an alkyl group containing 1-10 carbon atoms or a hydrogen atom. The hydrogen fluoride is used in amount of not less than 3 moles but not more than 20 moles, and boron trifluoride is used in amount of not less than 1.1 moles but not more than 5 moles per mole of the benzene derivative of formula (1a), and formylation is carried out at temperature from -50C to 30C.EFFECT: invention enables selective synthesis of desired products with high purity.10 cl, 15 ex
ethod of producing 2,6-dimethyl-1-naphthaldehyde // 2440967
FIELD: chemistry.SUBSTANCE: present invention relates to a method of producing 2,6-dimethyl-1-naphthaldehyde which is used in industrial chemical materials and raw materials for pharmaceutical products, pesticides, optical functional materials and electronic functional materials. The method involves formylation of 2,6-dimethylnaphthalene with carbon monoxide in the presence of hydrogen fluoride in terms of moles in amount ranging from 5- to 100-fold and boron trifluoride in terms of moles in amount ranging from 0.5- to 3.5-fold compared to the amount of 2,6-dimethylnaphthalene, and at reaction temperature ranging from 35 to 70C.EFFECT: method enables to obtain and end product with high selectivity.15 ex

The method of obtaining tris-formylrifamycin // 2100344
The invention relates to organic chemistry, namely, the method of production of triptycene derivatives, in particular the production of Tris-formylrifamycin with substituents in positions of three different rings triptycene fragment
 
2551134.
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