Abstract: Hexachlorodisilane and residues formed therefrom are disposed of without generating pyrophoric compositions by reaction with urea and alcohol in nonpolar solvent.

Abstract: Process for preparing organoalkoxyhydrosilanes with a boron content less than 100 ppb and of the formula R1xHySi(OR2)z where x+y+z=4 and x, y, z are greater than or equal to 1, wherein, in a first step, a boron-contaminated organohalohydrosilane of the formula R1xHySiHalz where x+y+z=4, x, y, z are greater than or equal to 1, and R1 are linear or branched alkyl, cycloalkyl, aryl, alkenyl or arylalkyl radicals having 1 to 12 carbon atoms and Hal is F, Cl, Br or I, is subjected to a treatment with silica or aluminosilicate and the silica or the aluminosilicate is subsequently removed from the organohalohydrosilane in a second step and then the purified organohalohydrosilane is reacted with alcohol R2—OH where R2 is a methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl or tert-pentyl radical.

Abstract: Ultra high purity hexachlorodisilane is prepared from hexachlorodisilane-containing mixtures from numerous sources by distillation wherein water is present at less than 10 ppbw.

Abstract: Hexachlorodisilane and residues formed therefrom are disposed of without generating pyrophoric compositions by reaction with urea and alcohol in nonpolar solvent.

Abstract: Process for preparing organoalkoxyhydrosilanes with a boron content less than 100 ppb and of the formula R1xHySi(OR2)z where x+y+z=4 and x, y, z are greater than or equal to 1, wherein, in a first step, a boron-contaminated organohalohydrosilane of the formula R1xHySiHalz where x+y+z=4, x, y, z are greater than or equal to 1, and R1 are linear or branched alkyl, cycloalkyl, aryl, alkenyl or arylalkyl radicals having 1 to 12 carbon atoms and Hal is F, Cl, Br or I, is subjected to a treatment with silica or aluminosilicate and the silica or the aluminosilicate is subsequently removed from the organohalohydrosilane in a second step and then the purified organohalohydrosilane is reacted with alcohol R2—OH where R2 is a methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl or tert-pentyl radical.

Abstract: Ultra high purity hexachlorodisilane is prepared from hexachlorodisilane-containing mixtures from numerous sources by distillation wherein water is present at less than 10 ppbw.

Abstract: The invention relates to a process for preparing crosslinked or branched organopolysilanes which contain at least one unit of the general formulae 1 and/or 2 RSi?,??(1) ?Si?,??(2) at least one unit of the general formula 3 R2Si?,??(3) and optionally units of the general formula 4 R3Si—??(4) in which silane(s) of the general formulae 1a and 2a RSiX3,??(1a) SiX4,??(2a) and 3a R2SiX2,??(3a) and optionally silane of the general formula 4a R3SiX,??(4a) where R is hydrocarbyl and X is halo, are reacted with elemental metal, the addition of the reactants being such that the silane of the general formula 3a in the reaction with elemental metal contains at most 2 mol % of silane which is selected from silanes of the general formulae 1a and 2a, and to the organopolysilanes obtainable by the process.

Abstract: A process for preparing crosslinked or branched organopolysilanes involves reacting halosilanes with alkali metal and/or alkaline earth metal, the reaction mixture, immediately after reaction has ended, being treated at at least 50° C. for at least 30 seconds with a mineral treating agent which is one or more polysilicic acids, silicates or aluminosilicates.

Abstract: A process for preparing crosslinked or branched organopolysilanes involves reacting halosilanes with alkali metal and/or alkaline earth metal, the reaction mixture, immediately after reaction has ended, being treated at at least 50° C. for at least 30 seconds with a mineral treating agent which is one or more polysilicic acids, silicates or aluminosilicates.

Abstract: The invention relates to a process for preparing crosslinked or branched organopolysilanes which contain at least one unit of the general formulae 1 and/or 2 RSi???(1), ?Si???(2), at least one unit of the general formula 3 R2Si???(3), and optionally units of the general formula 4 R3Si—??(4) in which silane(s) of the general formulae 1a and 2a RSiX3??(1a), SiX4??(2a), and 3a R2SiX2??(3a), and optionally silane of the general formula 4a R3SiX??(4a), where R is hydrocarbyl and X is halo, are reacted with elemental metal, the addition of the reactants being such that the silane of the general formula 3a in the reaction with elemental metal contains at most 2 mol % of silane which is selected from silanes of the general formulae 1a and 2a, and to the organopolysilanes obtainable by the process.