Abstract
1. Substitution of one and two CO groups by donor phosphine ligands PPh3 and PEt3 leads to an increased stability of the α-cymantrenyl carbenium ions, with diphosphine ligands manifesting a greater stabilizing effect than the monophosphines. 2. Manganese and rhenium stabilize the α-carbonium center to an almost identical degree. 3. The residue (CO) (Ph2PCH2CH2PPh2)MnC5H4 is a strong electron donor, at least as strong as the ferrocene residue.
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