Synthesys of complicated salts of chromelium on the base of 7-(2.4-dioxo-2n, 3n chromene-3-il)-6n, 7n-chromeno [4,3-b]chromene-6-ona: quantum-mechanical study
The synthesis of complicated salts of chromelium containing the coumarin fragment has been carried out. The most probable way of their formation under aromatization of tetrahydroxyxanthene ring of 7-(2,4-dioxo-2N,3N-chromene-3-il)-6N,7N-chromeno[4,3-b]chromene-6-one at the action of acid reagents (chloric acid, etherate of three fluoric boron ) has been proposed on the base of quantum-mechanical calculation. The composition and structure of reaction products have been confirmed with the data of elemental analysis and IR and NMR <sup>1</sup>Н spectroscopy.