Alkylative Preparation of alpha-Silylalkylmagnesium from R(3)SiCHBr(2) Using a Magnesate Reagent This work was supported by a Grant-in-Aid for Scientific Research (Nos. 09450341 and 10208208) from the Ministry of Education, Culture, Sports, Science, and Technology. A.I. acknowledges the JSPS Research Fellowship for Young Scientists for financial support.