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Octacarbonyldicobalt reacts with the ditertiary phosphine and arsine (C 6 H 5 ) 2 -ECH 2 CH 2 E(C 6 H 5 ) 2  (E = P, As) in a direct route to give primarily the non CO-bridged, but ligand-bridged complexes Co 2 (CO) 6 (C 6 H 5 ) 2 ECH 2 CH 2 E(C 6 H 5 ) 2 . From Co 2 (CO) 6 -(C 6 H 5 ) 2 PCH 2 CH 2 P(C 6 H 5 ) 2  secondarily a CO-bridged isomer has been also isolated. The non-CO-bridged form of Co 2 (CO) 6 (C 6 H 5 ) 2 PCH 2 CH 2 P(C 6 H 5 ) 2  gives insertion reactions with Hg, SnCl 2  and CsGeCl 3  yielding the probably oligo- or polymeric compounds Hg[Co(CO) 3 ] 2 (C 6 H 5 ) 2 PCH 2 CH 2 P(C 6 H 5 ) 2  and Cl 2 M[Co(CO) 3 ] 2 (C 6 H 5 ) 2 PCH 2 CH 2 P(C 6 H 5 ) 2  (M = Sn, Ge). The characteristic IR absorptions of all compounds and some Raman spectra are reported.

zeitschrift für naturforschung b

Komplexchemie polyfunktioneller Liganden, XXXIV.: Direkte Synthese und Derivate von Co 2 (CO) 6 (R 2 ECH 2 CH 2 ER 2 ) (E=P, As; R=C 6 H 5 ) / Complex Chemistry of Polyfunctional Ligands, XXXIV Direct Synthesis and Derivatives of Co 2 (CO) 6 (R 2 ECH 2 CH 2 ER 2 ) (E = P, As; R = C 6 H 5 )