Preparing silane compound, by reacting silicide/silicon alloy in form of powder, in presence of ca

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A process for preparing a compound or a mixture of compounds of formula if H wherein n is an integer greater than or equal to 1 and less than or equal to 3, comprising a step a) of reacting at least one silicide or silicon alloy powder m If formula m wherein m is a reducing metal, M an alkali metal or alkaline earth metal, X, and vary from 0 to 1, 0 and z being different from the sum x+y different from 0, with hydrochloric acid previously dissolved in aqueous solution characterized in that step a) is carried out in the presence of CaCl.