Galliums transmetallation

Naphthalene-based bifunctional Lewis acids that involve boron and a heavier group 13 element have also been prepared starting from the boron/tin derivative 30 (Scheme 15). Thus, the transmetalation reaction of 30 with gallium trichloride or indium trichloride in tetrahydrofuran (THF) results in high yields of l-(dichlorogallium)-8-(dimesitylboron)naphthalenediyl 35 and l-(dichloroindium)-8-(dimesitylboron)... 

Allylgallium sesquibromides can be prepared from allylic bromides and metallic gallium in the presence of a catalytic amount of indium, where the initially formed allylindium is converted to allylgallium. Fast transmetallation of an allyl group from indium to gallium accelerates the formation of allylgallium sesquibromide (Scheme 122). ... 

Gallium(III) Lewis acids can interact with various organic and inorganic molecules at the n electrons, n electrons, o electrons, and probably the d electrons as well, and activate the molecules towards nucleophilic attack, electrophilic attack, homolysis, deprotonation, hydride abstraction, transmetalation, carbometalation, oxidation, reduction, and other transformation reactions. The diverse reactivities of gallium(III) complexed molecules will be useful in organic synthesis. 

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