Method for the dehydrogenation of dichlorosilane

A method for the dehydrogenation of dichlorosilane in which hydrogen is formed, comprising:

• dehydrogenating dichlorosilane in the presence of an ammonium and/or phosphonium salt catalyst at a temperature within a range of 70-300° C., by reacting with either
• (A) at least one halogenated hydrocarbon of the formula (I)
• where
• X is F, Cl, Br or I;
• and
• R1 is a branched or unbranched C2-C20 alkyl radical,
• a branched or unbranched C2-C13 heteroalkyl radical, the carbon skeleton of which contains one or more heteroatoms independently selected from N, P, S or O,
• a branched or unbranched C1-C10 fluoroalkyl radical with partial or complete fluorination,
• a branched or unbranched C2-C20 alkenyl radical, excluding C2H4-nCln radicals where
• n is 2-4,
• a branched or unbranched C2-C20 alkynyl radical,
• a C3-C14 cycloalkyl radical,
• a C2-C13 heterocycloalkyl radical, the ring skeleton of which contains one or more heteroatoms independently selected from N, P, S or O,
• a C6-C14 aryl radical,
• a C5-C13 heteroaryl radical, the ring skeleton of which contains one or more heteroatoms independently selected from N, P, S or O, and/or
• (CH2)n-Ar, where Ar is a C6-C14 aryl radical and n is 1-5,
• where all of the above-mentioned radicals may be unsubstituted or else singly or multiply substituted by halogen, C1-C4 alkoxy, vinyl, phenyl or C1-C4 alkyl,
• radicals,
• (CH2)nX, where n is 1-10 and X is F, Cl, Br or I,
• R2—S—CH2 radicals, where R2 is C1-C6 alkyl or C6-C14 aryl,
• (CH2)nSiMe3-m-Clm, where n is 0-5 and m is 0, 1, 2, 3,
• (CH2)nNH(C═O)OCH3, where n is 1-5,
• (CH2)nOCH2 (oxirane), where n is 1-5,
• (CH2)O(C═O)(C(CH3)═CH2), where n is 1-5,
• (CH2)nNH2, where n is 1-5,
• (CH2)nNH(C═O)NH2, where n is 1-5, and
• (CH2)nNHR, where n=1-5, and R is cyclohexyl or C2H4NH2;
• or with
• (B) a hydrogen halide,
• wherein the molar ratio of dichlorosilane to hydrogen halide or halogenated hydrocarbon is within a range from 1:1 to 1:10.