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Two synthetic approaches for the preparation of tin(ii) dications.
Chemical Communications : Chem Comm 2017 October 4
Examples of tin dications without closer contacts to the anion are rare, as are straightforward routes to weakly coordinated tin(ii) dication salts. Here we report on the synthesis of [Sn(MeCN)6 ][Al(ORF )4 ]2 (RF = C(CF3 )3 ) via NO+ -oxidation of tin metal. Subsequently, [Sn(MeCN)6 ][Al(ORF )4 ]2 was used to prepare the mixed coordinated [Sn(pyr)2 (MeCN)4 ][Al(ORF )4 ]2 and [Sn(PPh3 )2 -(MeCN)5 ][Al(ORF )4 ]2 ·MeCN. Additionally, [Sn(dmap)4 ][Al(ORF )4 ]2 was prepared via a reaction of dmap with [SnCp][Al(ORF )4 ]. The generality of the formation of tin(ii) dications by reacting [SnCp]+ and L to give [SnLx ]2+ and SnCp2 was investigated using DFT calculations. Extensions to [ECp*]+ cations (E = Si, Ge, Sn, and Pb) are also suggested to be useful for the preparation of E(ii) dications.
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