FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for preparing diphenic acid imide by a single-step stage from diphenic acid directly. Method is carried out by reaction of diphenic acid with nitrogen-containing reagent. The process is carried out for a single stage in inert organic solvent not mixing with water and forming azeotropic mixture with water at the boiling point of reaction mass followed by distilling out water formed. Urea is used as nitrogen-containing reagent in the mole ratio diphenic acid : urea = 1:(0.5-4.0) or formamide in the mole ratio diphenic acid : formamide = 1:(20-100). Invention provides enhancing yield of the end product.
EFFECT: improved preparing method.
1 tbl, 2 dwg, 7 ex
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