The reaction of [Rh(coe)
2Cl]
2 (coe = cis-cyclooctene), bis(oxazolinyl)pyridine (pybox), and diynes(O(CH
2C
CCO
2Me)
2 and PhC
CCH
2OCH
2C
CCO
2Me) gave new types of metallacycle complexes, whichwere analyzed by X-ray crystallography and showedcatalytic activity for cycloaddition of diynes and severalalkynes.