METHOD FOR PREPARING TETRA-(2,3-QUINOXALINO)PORPHYRAZINE Russian patent published in 2006 - IPC C07D487/22 C09B47/67 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to the improved method for preparing tetra-(2,3-quinoxalino)porphyrazine. Method involves heating 2,3-dicyanoquinoxaline with alkaline metal compound and the following acid demetallization of formed product. As compound of alkaline method methods involves using dry sodium hydroxide and heating is carried out up to temperature 200-220°C followed by keeping formed melt at this temperature for 10-15 min. Method provides simultaneous significant simplifying and decreasing cost the method for preparing tetra-(2,3-quinoxalino)porphyrazine, to decrease number of technological stages and to enhance the yield of the end product by 1.4-fold.

EFFECT: improved preparing method.

2 cl, 1 tbl, 1 ex