Abstract: A process for preparing dimethyldichlorosilane by reacting chloromethane with silicon in the presence of a catalyst combination comprising the metals or compounds of the metals copper, zinc and tin and/or antimony, and chlorosilanes or chlorodisilanes as activators. The activators are fed into the reactor as a gas containing at most 15% by volume of hydrogen.

Abstract: A process is described for the electrochemical preparation of organosilicon compounds having at least one SiC-bound organic radical, a solution which contains at least one halosilane being subjected to an electrochemical reaction, an anode which contains a noble metal or an alloy consisting essentially of one or more noble metals having a halogen scavenger flowing around said anode.

Abstract: Methylchlorosilanes are prepared by reaction of methyl chloride with silicon in the presence of a catalyst combination of copper oxide, zinc oxide and metallic antimony.

Abstract: In the process of the present invention, disilanes are reacted with hydrogen chloride in the presence of a catalyst comprising(A) palladium(O) or platinum(O), and(B) an organic compound selected from among tertiary amines, carboxamides, alkylureas, tertiary phosphines, phosphoramides, quaternary ammonium halides, quaternary phosphonium halides or mixtures thereof to give hydrogen-containing methylchlorosilanes.

Abstract: Silanes containing hydrogen atoms bonded directly to silicon produced as by-products during methylchlorosilane synthesis are reacted with chlorohydrocarbons in the presence of palladium or platinum as catalysts to give the corresponding chlorosilanes.

Abstract: The present invention is a process wherein silanes containing hydrogen atoms bonded directly to silicon are removed from silanes of the general formulaR.sub.x Cl.sub.3-x Si--[SiR.sub.y Cl.sub.2-y ].sub.n --A (I)and mixtures thereof, in which R denotes an optionally halogen-substituted hydrocarbon radical having 1 to 18 carbon atoms which is free from ethylenic double bonds, A denotes a chlorine atom or a radical R, x has the value of 0, 1, 2 or 3, y has the value of 0, 1 or 2 and n has the value of 0 or 1. The silanes containing hydrogen atoms bonded directly to silicon are reacted with hydrogen chloride in the presence of silver or gold as catalysts to give the corresponding chlorosilanes.

Abstract: A process for preparing metallopolysilanes, which comprises reacting at least one disilane of the general formulaR.sub.6-n Si.sub.2 (OR.sup.1).sub.n (I)in which R may be the same or different and is a hydrogen atom or a monovalent hydrocarbon radical, R.sup.1 is the same or different monovalent alkyl groups, and n is 2, 3, 4, 5 or 6, and optionally mixed with at least one compound of the general formulaR.sup.2.sub.4-m Si(OR.sup.4)m (II)in which R.sup.2 may be the same or different and is the same as R, R.sup.4 may be the same or different and is the same as R.sup.1, and m is 1, 2, 3 or 4, with at least one compound of the general formula(R.sup.5 O)[A(OR.sup.5).sub.a-2.sup.O].sub.x R.sup.5 (III)in which R.sup.5 may be the same or different and is the same as R.sup.1, A is a metal from group IIa, IIIa, IVa, Va, IIIb, IVb or Vb of the Periodic Table, x is an integer of from 1 to 1,000, and a represents the valency of A, in the presence of at least one compound of the general formulaMOR.sup.3 (IV)in which R.sup.

Abstract: A process for the preparation of methylchlorosilanes which comprises reacting methylchlorodisilanes with hydrogen chloride in the presence of a metal from subgroup VIII of the Periodic Table as a catalyst. Preferably, finely divided palladium present on a support such as charcoal or activated carbon is used as a catalyst.

Abstract: A process for the preparation of organopolysilanes which comprises reacting at least one disilane of the general formulaR.sub.k R.sup.3.sub.m Si.sub.2 (OR.sup.1).sub.6-k-m (I)in which the radicals R may be the same or different and are hydrogen atoms or monovalent, saturated organic radicals, the radicals R.sup.3 may be the same or different and are monovalent, unsaturated organic radicals, the radicals R.sup.1 may be the same or different and are monovalent alkyl groups, k is 0, 1, 2 or 3, and m is 1, 2, 3 or 4, in which the sum of k and m is less than or equal to 4, and optionally mixed with a disilane of the formulaR.sub.n Si.sub.2 (OR.sup.1).sub.6-n (II)in which R and R.sup.1 are the same as above and n is 0, 1, 2 or 3, in the presence of at least one compound of the general formulaMOR.sup.2 (III)in which R.sup.2 is a monovalent hydrocarbon radical and M is an alkali metal atom.

Abstract: The invention related to coating compositions containing (poly)borosiloxanes, which contain at least one other component selected from lead, boron and aluminum compounds and talc, and to a process for preparing vitreous protective coatings, which can be applied to a substrate to be protected and then heat-treated to a temperature of at least 500.degree. C.

Abstract: The invention relates to a process for preparing organopolysilanes which comprises reacting an organosilicon compound containing Si-Si bonds and containing at least one radical of the formula--OR.sup.2where R.sup.2 represents hydrogen or an alkyl radical, with boric acid.