Arsenosiloxane: Bildung und Zerfall von Trialkylsilyl‐arsenaten und ‐arseniten

Michael Baier, Peter Bissinger, Hubert Schmidbaur

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Arsenosiloxanes: Formation and Decomposition of Trialkylsilyl Arsenates and Arsenites Tris(trialkylsilyl) arsenates(V) are prepared from silver arsenate(V) and chlorotrialkylsilanes or from arsenic acid and hexaalkyldisilazanes. The triethylsilyl ester 1b is stable, but the trimethylsilyl ester 1a undergoes condensation at ambient temperature to give hexamethyldisiloxane and trimethylsilylpolyarsenates(V), including tetrakis(trimethylsilyl) diarsenate(V) (4a). According to an X‐ray crystal structure determination of 4a (triclinic, space group P1) centrosymmetrical dimers are present containing two edge‐sharing AsO6 octahedra with apex‐bridging by two AsO4 tetrahedra. 1a is converted into the salt [(Me3SiO)4As]+ CF3SO3 the cation of which is believed to be a component of the reaction chain. There is also evidence by mass spectrometry for the existence of (Me3SiO)5As (5). — Tris(trimethylsilyl) arsenite(III) (6) is prepared from AsCl3 and NaOSiMe3. With modified stoichiometry, side reactions give also the byproducts Cl2AsOSiMe3, ClAs(OSiMe3)2, Cl2AsOAsCl2, Cl2AsOAsCl(OSiMe3), O[AsCl(OSiMe3)]2, and cyclic chloroarsenosiloxanes (12, 13).

Original languageGerman
Pages (from-to)373-376
Number of pages4
JournalChemische Berichte
Volume125
Issue number2
DOIs
StatePublished - Feb 1992
Externally publishedYes

Cite this