METHOD FOR PREPARING TETRAPYRAZINOPORPHYRAZINE Russian patent published in 2006 - IPC C07D487/22 C09B47/67 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to the improved method for preparing tetrapyrazinoporphyrazine. Method involves heating up of 2,3-dicyanopyrazine with compound of alkaline metal and the following acid demetallization of formed product. As compound of alkaline metal the method involves using dry sodium hydroxide and heating up is carried out to temperature 200-220°C and formed melt is kept at this temperature for 10-15 min. Method provides simultaneous significant simplifying and decreasing cost of the method for preparing tetrapyrazinoporphyrazine by diminishing number of technological stages by two times and to enhance the yield of the end product by 1.2-fold.

EFFECT: improved preparing method.

2 cl, 1 tbl, 1 ex