METHOD OF PRODUCING 3-ALKYL(ARYL)-2,2'-BITHIOPHENE-5-CARBOXYLIC ACIDS AND ESTERS THEREOF Russian patent published in 2012 - IPC C07D409/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing 3-alkyl(aryl)-2,2'-bithiophene-5-carboxylic acids and esters thereof of general formula I where R = C₁-C₁₀-alkyl or aryl; R₁ = hydrogen atom or C₁-C₄ alkyl, involving reaction of 2-acyl thiophenes of general formula II with dimethyl formamide and phosphoryl chloride, and the formed 2-alkyl(aryl)-3-chloro-3-(2-thienyl)acrylaldehyde of general formula III reacts with thioglycolic ester in the presence of a base, and by hydrolysis of the obtained esters of general formula I, where R assumes values given above and R₁=C₁-C₄ alkyl, 3-alkyl-2,2'-bithiophene-5-carboxylic acids are obtained, where R₁ = hydrogen atom.

EFFECT: simpler method of producing compounds of formula I, which can be used in synthesis of solvatochromic and thermochromic dendrimers, oligothiophenes with adjustable electrical and optical properties.

1 cl, 4 ex