Abstract
Abstract The reactions of a series of arsinic and arsonic acids with hydrogen sulfide and hydrogen selenide have been investigated. The various arsinic acids were found to produce a variety of products, but the reaction was characterized by the reduction of arsenic(V) to arsenic(III), loss of hydroxyl groups bonded to arsenic and, to a lesser degree, the rupture of arsenic-carbon bond(s). Phenylcarboxymethylarsinic acid yielded, on reaction with H2S or H2Se, 1,4-diphenyl-1,4-diarsa-2,3,5-trichalocogenapentanes, where the chalcogen atom is S or Se. Arsonic acids yielded as final products compounds having a range of stoichiometries ranging from RAsS to R-7As2S3. 1,4-Diphenyl-1,4-diarsa-2,3,5-triselenacyclopentane consists of a non-planar, five-membered ring in which the As–C bond distances are 1.962 A, the As—Se bond distances are 2.388 A and the Se—Se bond distance is 2.334 A. The bond distances are very close to those which are expected for single, covalent bonds.
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