Selective rearrangement of epoxysilanes to alpha-silylaldehydes has be
en achieved with high efficiency by using exceptionally bulky oxygenop
hilic methylaluminum bis(4-bromo-2,6-di-tert-butylphenoxide) (MABR) as
a stoichiometric reagent. Ctalytic use of MABR led to silyl enol ethe
rs in good yield.