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Cross-coupling of diethyl phosphonate with aryl iodides was performed using copper(I) iodide complexes with various bidentate ligands as catalysts.Resurgence of Ullmann chemistry led to development of catalytic methods for formation of new carbon-carbon bonds with the use of various copper complexes and especially strongly affected development of reactions involving formation of carbonheteroatom bonds, in particular bonds between aromatic or vinyl carbon atoms and sulfur, selenium, oxygen, nitrogen, and phosphorus. The formation of the latter was studied most poorly.After pioneering study by Gelman and Buchwald [1], where phosphorylation of aryl and vinyl iodides and vinyl bromides with dibutyl phosphonate was catalyzed by CuI with N,N′-dimethylethane-1,2-diamine (I) as ligand, Fu H. and co-workers [2, 3] reported on the synthesis of arylphosphonates, arylphosphinates, and arylphosphine oxides under catalysis by CuI complexes with proline (II), piperidine-2-carboxylic acid (III), and phenyl hydrogen pyrrolidin-2-ylphosphonate (IV) at 110°C. All these reactions required large amounts of CuI (10-20 mol %) and ligand (20-40 mol %) and long time (up to 36 h). The reactions of diphenylphosphine oxide and dibutyl and diisopropyl phosphonates with 2-bromotrifluoroacetanilide in the presence of N-methylpyrrolidine-2-carboxamide (V) as ligand were carried out at lower temperature (50°C), but a high concentration of CuI (30 mol %) and equimolar amount of the ligand (100 mol %) were necessary [4].