Аннотация:Reaction of two molecules of o -diphenylphosphino-tolane with RhCl(PPh3)3 produces the metallacycle complex with C4Rh(P3)Cl core. Further addition of tolane leads to 2+2+2-cycloaddition and gives the cationic complex [Rh(Ph2P-C6H4-C6Ph4-C6H4-PPh2)]Cl, in which the metal is coordinated to C6Ph4 aromatic ring as well to two chelating PPh2 groups. The resulting bulky terphenyl-diphosphine ligand with phosphorous atoms locked in cis-position can be decoordinated from rhodium by a strong and non-hindered ligand tBuNC. Peculiar structures of all the compounds were studied by the X-ray diffraction.