Analytical chemistry of the platinum metals. VIII. Application of phosphonium and arsonium salts to the gravimetric determination of osmium was written by Neeb, R.. And the article was included in Fresenius’ Zeitschrift fuer Analytische Chemie in 1960.Electric Literature of C23H26BrP This article mentions the following:
Solubility determinations are reported of halo-osmates of substituted phosphonium and arsonium compounds, and several are investigated for determining Os. Those recommended are tetraphenylarsonium chloride and benzyltriphenylphosphonium chloride in HCl solution, and tetraphenylarsonium and tetraphenylphosphonium chlorides in HBr solution In the experiment, the researchers used many compounds, for example, Isopentyltriphenylphosphonium bromide (cas: 28322-40-9Electric Literature of C23H26BrP).
Isopentyltriphenylphosphonium bromide (cas: 28322-40-9) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. Many of the alkyl bromine derivatives are excellent alkylating agents since bromides are good leaving groups. Tribromides, like tetrabutylammonium tribromide, are used as a solid source of bromine. N-bromosuccimide (NBS) is used for the selective bromination of allylic bonds.Electric Literature of C23H26BrP
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary