Ethylation of methylarsenic(III) compounds by sodium tetraethylborate
1993; Wiley; Volume: 7; Issue: 7 Linguagem: Inglês
10.1002/aoc.590070718
ISSN1099-0739
AutoresVincent Clamagirand, lain L Marr, J.L. Wardell,
Tópico(s)Selenium in Biological Systems
ResumoAbstract The compounds MeAsBr 2 and Me 2 AsBr at concentrations of (1–5) × 10 −3 M in acetone solution are ethylated in high yield by NaBEt 4 to MeEt 2 As and Me 2 EtAs, as shown by 1 H NMR spectroscopy. The extents of ethylation of MeAs 2+ and Me 2 As + (expressed as ions, by convention) in aqueous acid solutions [at concentrations of (5–20) × 10 −6 M ] were investigated using cold trap/AA and GC AA procedures. The species Me 2 As + was ethylated (to give Me 2 EtAs) in good yield (88%); in contrast, MeAs 2+ produced the volatile trialkylarsine, MeEt 2 As, in poor yield (30%). No volatile trialkylarsine could be obtained on treating inorganic arsenic(III) (As 3+ ) solutions with NaBEt 4 .
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