The interaction of 2-(5-methyl-2-phenyl-2h-1,2,3-diazaphosphol-4-yl)-4h-benzo[<i>e</i>]-1,3,2-dioxaphosphinin-4-one with activated carbonyl compounds. Synthesis of bis-heterocyclic systems containing di- and tetracoordinated phosphorus

<p>The interaction of 2-(5-methyl-2-phenyl-2<i>H</i>-1,2,3-diazaphosphol-4-yl)-4<i>H</i>-benzo[<i>e</i>]-1,3,2-dioxaphosphinin-4-one with mesoxalic and trifluoropyruvic acids ethyl and diethyl esters, hexafluoroacetone and chloral proceeds with an exclusive participation of P(III) atom and allows to obtain 2-(5-methyl-2-phenyl-2<i>H</i>-1,2,3-diazaphosphol-4-yl)-derivatives of 1,4,2- and 1,3,2-dioxaphosphepines as well as dichlorovinylphosphonate, being the product of Perkow reaction in the case of chloral.</p