- Process for preparing low-chloride or chloride-free alkoxysilanes
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A process for preparing an alkoxysilane with an acidic chloride content of less than 10 ppm by weight, comprising: reacting a chlorosilane with an alcohol in a water-free and solvent-free phase to form a product mixture containing alkoxysilane and residual acidic chloride, with removal of resultant hydrogen chloride from the product mixture, then adding liquid or gaseous ammonia, in an amount corresponding to a stoichiometric excess, based on the content of acidic chloride, to form an ammonia-containing product mixture, treating the ammonia-containing product mixture at a temperature between 10 and 50 DEG C., wherein the ammonia and acidic chloride undergo neutralization, to form a crude product, and optionally, then separating off a salt formed in the course of neutralization, from the crude product, and recovering the alkoxysilane by distilling the crude product.
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- Process for the preparation of organoalkoxysilanes
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An improvement in a process for the esterification of a organochlorosilane by feeding alcohol into a chlorosilane maintained within a reaction zone without said alcohol contacting said chlorosilane in the gas phase wherein the esterification is performed stepwise with extraction of hydrogen chloride which has developed, the improvement which comprises employing in at least a final esterification step an organochlorosilane of the formula wherein R represents an optionally halogen-substituted alkyl radical which can also contain an oxygen or sulfur atom in the chain, or a halogen or a NO2 group or a protected phenolic group containing aryl radical, a equals 0, 1, or 2, b equals 1 or 2, and a+b amounts to a maximum of 3, said final esterification step being performed with the addition of heat.
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- Process for the production of alkoxy-β-halogenoethylsilanes
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A process for the production of trialkoxy-β-halogenoethylsilanes and dialkoxy-methyl-β-halogenoethylsilanes by reaction of a corresponding β-halogenoethyltrichlorosilane or β-halogenoethyl-methyldichlorosilane with an alcohol in the presence of ammonia is disclosed. The trialkoxy-β-halogenoethylsilanes and dialkoxy-methyl-β-halogenoethylsilanes obtained by this process are active substances for regulating plant growth.
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