The author of 《Ladderization of polystyrene derivatives by palladium-catalyzed polymer direct arylation》 were Takagi, Koji; Tanaka, Hidetoshi; Mikami, Koichiro. And the article was published in Polymer Chemistry in 2019. SDS of cas: 1779-49-3 The author mentioned the following in the article:
Ladderization of polystyrene derivatives successfully proceeded by palladium-catalyzed polymer direct arylation in the presence of a phosphine ligand and pivalic acid using poly(2-bromostyrene) as a prepolymer, in which the polymer tacticity had little influence on the reaction efficiency. The reaction mechanism was supported by theor. calculation in detail. The optical and thermal properties of pseudo-ladderized polystyrene suggested enhanced chain rigidity. The experimental process involved the reaction of Methyltriphenylphosphonium bromide(cas: 1779-49-3SDS of cas: 1779-49-3)
Methyltriphenylphosphonium bromide(cas: 1779-49-3) is an organophosphorus compound, with potential use as a precursor and a solvent in organic synthesis. And it is used widely for methylenation via the Wittig reaction.SDS of cas: 1779-49-3
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary