METHOD OF PURIFYING THIOPHENES, THIOPHENES PURIFIED USING SAID METHOD, THIOPHENES AND USE THEREOF Russian patent published in 2010 - IPC C07D495/04 C07D333/10 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of purifying thiopenes of formula (I) which are liquid at room temperature and can be used in organic synthesis to produce an electroconductive polymer or an organic semiconductor. The proposed method involves precipitation of thiophene of formula (I) , where R¹ and R² represent hydrogen, optionally broken by 1-5 O and/or S atoms C_1-20alkyl, C_1-20alkoxy, or R¹ and R² together represent optionally substituted C_1-20dioxyalkylene or C_6-20dioxyarylene group, where the thiophene is precipitated from a solution in isobutyl-methylketone, chloroform, methylene chloride, toluene, methanol, propanol, ethanol, acetone, isopropanol, n-butanol, fluorobutanol, dimethylformamide, methyl-tertbutyl ether, tetrahydrofuran, diethyl ether, hexane, pentane or mixtures thereof in ratio solvent : thiophene ranging from 0.01:1 to 10:1, cooled to temperature at least 10°C below melting point of the thiophene being purified in pure form, with subsequent separation of thiophene by filtration at low temperature.

EFFECT: design of a new efficient method of purifying low-melting thiophenes.

14 cl, 2 ex