Trimethylhalosilane Preparations¹

Abstract

NotesVol. 70 130 g. (0.85 mole) of trimethylbromosilane,• b. p. 79°( 744 mm.), a yield of 85%, and 130 g. (0.84 mole) of bromobenzene. The bromosilane was analyzed for bromine content.

Silyl‐Substituted Tetrathia[7]helicenes: Synthesis, X‐ray Characterization and Reactivity

“…The treatment of 4a with bromine [18] or ICl [19] (Scheme 10) furnished 2,13-dihalo [7]TH 14 and 15 in high yield and in a facile manner. In fact, the corresponding halogenated products could be recovered by filtration from the reaction mixture and no chromatographic purification was necessary.…”

Chemical modification of poly(methylphenylsiloxane)

“…2). 11 The cleavage can be treated as an aromatic substitution reaction of an electrophilic species, Br ϩ , for the silyl group on the benzene ring.…”

Organosilicon Derivatives of Sulfur

“…Triorganosilyl hydrosulfates or triorganosilyl sulfates are evidently intermediates in syntheses of triorganohalosilanes from hexaorganodisiloxanes, sulfuric acid, and ammonium halides [315,363,436,448,565,657,662,666,667].…”

“…This reaction is carried out in the presence of ammonium sulfate, which prevents the reverse reaction of the organochlorosilane with sulfuric acid: (2.186) Reaction (2.186) is used to prepare trialkylhalosilanes, when the bis(triorganosilyl) sulfate is treated with an ammonium halide instead of a hydrogen halide [9,315,363,436,448,565,657,662,666,667,679]. This eliminates the need to prepare the dry hydrogen halide beforehand, and the need to add ammonium sulfate, since the latter is formed directly in the reaction mixture during the process itself.…”