Abstract. Metalation of secondary phosphanes HPRRЈ [R = RЈ = C 6 H 4 -4-Me, C 6 H 3 -3,5-Me 2 (3), C 6 H 4 -4-NMe 2 (4); R/RЈ = Ph/cHex] with Mn 2 (CO) 10 in boiling xylene (mixture of isomers), until the evolution of gaseous carbon monoxide ceases, leads to the formation of the dinuclear complexes of the type [(OC) 4 Mn(μ-PRRЈ)] 2 [R = RЈ = C 6 H 4 -4-Me (5), C 6 H 3 -3,5-Me 2 (6), R/RЈ = Ph/cHex (7), R = RЈ = C 6 H 4 -