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Arsenic ring systems

Various three-and four-membered phosphorus-arsenic ring systems, e.g., (58), have been isolated from the reactions of aryldichloroarsines with bis(trimethylsilyl)phosphido complexes of... [Pg.9]

Three- and five-membered rings (AS2S and AS2S3) have also been structurally characterised for the arsenic-sulfur system. The diarsathiiran cyclo-(RAs)2S [R = C(SiMe3)3] is prepared by the addition of sulfur to the diarsene RAs=AsR. The non-planar five-membered ring cyclo-(PhAs)2S3 is obtained, in addition to cyclo-(PhAsS)4, from treatment of phenylarsenic acid with aqueous ammonia and hydrogen sulfide. ... [Pg.262]

There is a very extensive heterocyclic chemistry of tricoordinate arsenic wherein arsenic is incorporated in four- to ten-membered ring systems. Although the most prevalent synthetic route involves the reaction of a dihaloarsine with a di-Grignard or dilithium reagent, there are many custom syntheses to specific heterocycles. The synthesis and reactivity of the heterocyclic arsenic chemistry will not be reviewed here. Instead, the reader is referred to the comprehensive treatise by Mann and the primary literature that is cited therein. ... [Pg.251]

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Arsenic rings

Arsenic systems

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