Hypervalent stannates

Other methods of activating organostannanes have been reported in literature. These methods capitalize on the use of fluoride ions and the formation in situ or not of activated hypervalent stannate intermediates. For instance, Garcia Martinez has used the hypervalent tin reagent tetrabutylammonium difluorotribenzylstannate 24 (prepared in quantitative yield from BnsSnF) in the synthesis of unsymmetrical diarylmethanes... 

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