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The metallo-arsanes CP(CO)\(_3\)M - AsMc\(_2\) (1 a, b) (M = Mo, W) are convcrted to the double arsenido-bridged dinuclear complexes [(η-AsMe\(_2\))Mo(CO)\(_2\)Cp]\(_2\) (3a, b) in the presence of [CP(CO)\(_3\)Mo]\(_2\). Due to the unusual mild conditions of aggregation the intermediate formation of the double bonded species Cp(CO)\(_2\)M = AsMe\(_2\) (2a, b) is postulated. The crystal structure of 3a is reported, which shows mutual trans arrangement of the cyclopentadienyl and CO ligands.