The least-coordinating anion [(RFO)3Al–F–Al(ORF)3]– and its more Lewis-basic brother [F–Al(ORF)3]– (RF = C(CF3)3).

The formation of simple non-classical silylium ions from [Me3Si]+ sources and alkenes or alkynes was investigated, but mainly oligomerization was observed. Yet, the reaction with MeCCMe led to a room temperature stable cyclobutenyl cation. DFT calculations suggest that a non-classical silylium ion intermediate was formed on the way to this product.