METHOD OF PRODUCING 3,4-DITHIENYL-SUBSTITUTED MALEIC ANHYDRIDES OR MALEIMIDES Russian patent published in 2010 - IPC C07D417/14 C07D409/14 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing new 3,4-dithienyl-substituted maleic anhydrides or maleimides of general formula I: , where X=O, or NR₁; R₁ and R₂=alkyl C₁-C₄; R₃=alkyl C₁-C₄, or nitrogen- and/or sulphur-containing heterocyclic substitute. The method involves reacting the corresponding 2,5-disubstituted 3-thienyl-acetic acid with the corresponding 2,5-disubstituted 3-halogen acetythiophenes while heating in the presence of a base in a medium of inert organic solvent in atmospheric oxygen with subsequent separation of the end product of general formula I, where X=O, or, if necessary, the latter is converted to a compound of general formula I, where X=NR₁, where R₁ assumes values given above, by treating it with the corresponding amine. These compounds can be used as photochromes, which are widely used as optical switches in high-capacity data carriers used for recording, processing and storing data.

EFFECT: versatility of the method, ie possibility of obtaining compounds with and without equivalent heterocyclic substitutes using readily available thienyl-acetic acid and halogen ketones of the thiophene family, which considerably widens the assortment of organic photochromic dithienylethenes.

4 cl, 5 ex