The reaction of lithium bromosilylenoid with MesLi at -10
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C followed by addition of MgBr
2 gavelithium mesitylsilylenoid as a complex with magnesium bromide that was transmetalated by MgBr
2 at45
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C in THF to give magnesium silylenoid as a weak MgBr
2 complex of trisylmesitylsilylene. A newmagnesium mesitylsilylenoid species was stable at reflux temperature in THF and
n-hexane and showedamphiphilic properties in the reaction with 2-propanol, water, and
nBuLi, respectively.