Cadmium dimeric cation

A dissolution mechanism for zinc, cadmium and mercury in their molten halides has been proposed on the basis of experimental and literature data.949 Dissolution occurs at the metal-salt phase boundary. Adsorbed M24- cations are reduced to M+ ions which then migrate into the salt phase where Mi4" dimers form. The stability of the M2+ ions was found to increase in the order Zn < Cd Hg (the latter is so stable that Hg+ is undetectable in solution). 

When cadmiiun atoms are sorbed into Cd2+-containing zeolites, redox reaction occurs to give cadmium ions in the 1+ oxidation state. These are found both as discrete Cdl" " cations and dimers. In addition, neutral atoms may be sorbed without oxidation, in one... 

Use of strongly anionic nucleophiles such as alkylmagnesium halides and lithium alkyls leads to reductive dimerization or displacement of the olefin. It is quite possible however that alkylation of olefin-iron cations (IX) would be feasible with alkyl derivatives of zinc, cadmium, or tin reagents. Alkylation of dienyliron cations with dialkylzinc and dialkylcadmium reagents has recently been demonstrated (Section III,A,4). Alkylation of olefin-iron cations can be achieved under mild conditions with cr-bonded allyliron compounds [Eqs. (9) and (10), (Rosan et ai, 1973)]. 

Although alkylmagnesium halides lead to reductive dimerization of the dienyl cations, synthetically useful alkylations and arylations have recently been achieved using zinc and cadmium reagents [Eqs. (41) and (42) (Birch and Pearson, 1975)]. 

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