Abstract: Hydroxyl-terminal organopolysiloxanes having diorganosiloxy groups and Si—H groups are prepared by reacting the appropriate chlorosilanes with less than 0.5 mol water per mol of hydrolyzable chlorine in a first step and recovering gaseous HCl, and more fully hydrolyzing with additional water in a second step.

Abstract: Hydroxyl-terminal organopolysiloxanes having diorganylsiloxy [diorganosiloxy ??] groups and Si—H groups are prepared by reacting the appropriate chlorosilanes with less than 0.5 mol water per mol of hydrolyzable chlorine in a first step and recovering gaseous HCl, and more fully hydrolyzing with additional water in a second step.

Abstract: The invention provides a process for preparing linear organopolysiloxanes (P) having diorganosiloxy units and Si—H groups, in which, in a first step, diorganodichlorosilanes (A) and monochlorosilanes (B) and optionally dichlorosilanes (C), at least one of the monochlorosilanes (B) or dichlorosilanes (C) containing Si—H groups, are reacted with at most 0.5 mol of water per mole of hydrolyzable chlorine to give a partial hydrolyzate (T) and gaseous hydrogen chloride, and, in a second step, the SiCl groups still present in the partial hydrolyzate (T) are removed by treating with water to form hydrochloric acid, and a hydrolyzate (H) containing the organopolysiloxanes (P) is obtained.

Abstract: The invention provides a process for preparing linear organopolysiloxanes (P) having diorganosiloxy units and Si—H groups, in which, in a first step, diorganodichlorosilanes (A) and monochlorosilanes (B) and optionally dichlorosilanes (C), at least one of the monochlorosilanes (B) or dichlorosilanes (C) containing Si—H groups, are reacted with at most 0.5 mol of water per mole of hydrolyzable chlorine to give a partial hydrolyzate (T) and gaseous hydrogen chloride, and, in a second step, the SiCl groups still present in the partial hydrolyzate (T) are removed by treating with water to form hydrochloric acid, and a hydrolyzate (H) containing the organopolysiloxanes (P) is obtained.

Abstract: A process for the preparation of di- and trialkylsilanes of the general formula (I) RaR1bSiXc  (I), in which mono- or dialkylsilanes of the general formula (II) R1bSiHaXc  (II) are reacted with alkenes A which have at least 3 carbon atoms and are optionally substituted by fluorine, chlorine or bromine atoms or cyano groups, in the presence of a transition metal catalyst and a trihalogenosilane of the general formula (III) R2SiY3  (III) as an activator, wherein, in the above general formulae (I) to (III), R is a branched or cyclic hydrocarbon radical having at least 3 carbon atoms, optionally substituted by fluorine, chlorine, or bromine, or cyano groups, R1 is an alkyl radical optionally substituted by fluorine, chlorine, or bromine, or cyano groups, R2 is a hydrogen atom, or an alkyl radical optionally substituted by fluorine, chlorine, or bromine, or cyano groups, X is fluorine, chlorine, or bromine, or an alkoxy radical having 1 to 18 carbon atoms optionally substi

Abstract: A process for preparing methylhydrogenpolysiloxanes having trimethylsilyl end groups wherein, in a first step, methyldichlorosilane and trimethylchlorosilane are reacted with at most 0.5 mol of water per mole of hydrolyzable chlorine to give a partial hydrolysate and gaseous hydrogen chloride and, in a second step, the partial hydrolysate, to remove the SiCl groups still present, is treated with water, forming hydrochloric acid.

Abstract: The invention relates to a process for preparing organosilanes which contain at least one Si-bonded hydrogen in the presence of a phosphonium catalyst, the phosphonium catalyst itself and also a process for its preparation.

Abstract: Di- and trialkylsilanes of the formulaR.sub.a R.sup.1 R.sup.2.sub.b SiX.sub.c (I),which comprises reacting mono- and dialkylsilanes of the formulaR.sup.1 R.sup.2.sub.b SiH.sub.a X.sub.c (II),with alkenes A having at least 4 carbon atoms, which alkenes are unsubstituted or substituted by fluorine, chlorine or bromine atoms or cyano groups, in the presence of a transition metal catalyst and a hydrocarbon as activator, which hydrocarbon has at least one functional group selected from among aldehyde, keto and epoxy groups or halogen atoms, where in the above formulae (I) and (II),R is a branched or cyclic hydrocarbon radical having at least 4 carbon atoms, which radical is unsubstituted or substituted by fluorine, chlorine or bromine atoms or cyano groups,R.sup.1 is an alkyl radical having at least 2 carbon atoms, which radical is unsubstituted or substituted by fluorine, chlorine or bromine atoms or cyano groups,R.sup.

Abstract: The invention relates to a process for purifyng crude gaseous hydrogen chloride originating from plants producing silane or siloxane and containing as impurities silanes which contain chlorine and/or organic radicals, water, alkanols, hydrocarbons, chlorinated hydrocarbons, organic acids and derivatives thereof, by condensation, compression and fractional distillation. In this process, the crude gas is at least partially freed from condensable products by cooling to -35.degree. C., then compressed in a screw compressor with oil injection to 1.5 MPa, the oil is separated off, freed from gel-containing residues through a filter web and again recycled into the compressor. The compressed hydrogen chloride gas is fractionated in a distillation column under pressure and hydrogen chloride having a purity of 99.999 percent is recovered.

Abstract: This invention relates to a process for preparing tetrafluoroethyloxyalkyl silanes by the addition of silanes containing Si-bonded hydrogen to tetrafluoroethyl-alkenylether in a tubular reactor in which the reaction mixture containing an excess of silanes is recycled at a rate of at least 10 meters per minute.

Abstract: A continuous process for preparing silanes and siloxanes having SiOC groups which comprises (a) introducing in a liquid phase a chlorosilane and a hydroxyl-containing aliphatic compound in parallel flow into a first stage of a first reactor in an amount such that from 0.5 to 0.

Abstract: A process for the addition of Si-bonded hydrogen to an aliphatic multiple bond in the presence of a platinum catalyst which is obtained by dissolving a platinum halide in at least 20 parts by weight of olefin for each part by weight of the platinum halide, and subsequently heating and mixing the solution obtained with from 0.5 to 1 mole of a primary and/or secondary amine for each gram atom of platinum.

Abstract: This invention relates to the preparation of organosilicon compounds by the addition of a silicon compound containing Si-bonded hydrogen to a compound having an aliphatic multiple bond in the presence of a catalyst which promotes the addition of Si-bonded hydrogen to compounds containing an aliphatic multiple bond. In this process the reactants and the catalyst are continuously introduced into a pipe-shaped reactor while the contents of the reactor, which are maintained in a liquid phase by the application of pressure are circulated in the reactor at a rate of at least 1,000 cm per minute and while the reaction mixture is continuously being removed from the reactor.