Process for preparing aminoalkysilanes

A process for preparing aminoalkylsilanes of the general formula (V) and/or (VI),

• comprising reacting cyclic silazanes of the formula (I), (IV), or both (I) and (IV)
• with alcohols of the formula (III)
• R3—OH (III),
• where
• R is a divalent, optionally cyano- or halogen-substituted C3-C15-hydrocarbon radical in which one or more nonadjacent methylene units are optionally replaced by groups —O—, —CO—, —COO—, —OCO—, or —OCOO—, —S—, or —NRx—, and in which one or more nonadjacent methyne units are optionally replaced by groups —N═, —N═—, or —P═, R being bonded to silicon by an Si—C bond and to nitrogen by a C—N bond, where at least 3 and at most 6 atoms are located between silicon and nitrogen atoms in the ring structure
• of cyclic silazenes(I and IV),
• Rx is hydrogen or a C1-C10-hydrocarbon radical, optionally halogen-substituted, and
• R2 is a hydrogen atom or a monovalent, optionally cyano- or halogen-substituted, Si—C— bonded C1-C20-hydrocarbon radical or C1-C20-oxyhydrocarbon radical, in which, in each case, one or more nonadjacent methylene units are optionally replaced by groups —O—, —CO—, —COO—, —OCO—, or —OCOO—, —S—, or—NRx—, and in which one or more nonadjacent methyne units are optionally replaced by groups —N═, —N═, or —P═, and
• R3 is a monovalent C1-C20-hydrocarbon radical in which in each case one or more nonadjacent methylene units are optionally replaced by groups —O—, —CO—, —COO—, —OCO—, or —OCOO—, —S—, or —NRx—, and in which one or more nonadjacent methyne units are optionally replaced by groups —N═, —N═N—, or —P═.