Yang, Hongxuan et al. published their research in Synthesis in 2020 | CAS: 28322-40-9

Isopentyltriphenylphosphonium bromide (cas: 28322-40-9) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Formula: C23H26BrP

Stereoselective Rhodium-Catalyzed Isomerization of Stereoisomeric Mixtures of Arylalkenes was written by Yang, Hongxuan;Dong, Wenke;Wang, Wencan;Li, Tao;Zhao, Wanxiang. And the article was included in Synthesis in 2020.Formula: C23H26BrP This article mentions the following:

A new efficient method for the synthesis of a high ratio of E-alkenes (E)-ArCH=CHR (Ar = C6H5, 4-pyridyl, 2-thienyl, etc.; R = i-Pr, Ph, Bn) from E/ Z mixtures of alkenes (E)/(Z)-ArCH=CHR with B2pin2 in the presence of a rhodium catalyst is described. This reaction features mild reaction conditions, broad functional group tolerance, and highly great application potential. In the experiment, the researchers used many compounds, for example, Isopentyltriphenylphosphonium bromide (cas: 28322-40-9Formula: C23H26BrP).

Isopentyltriphenylphosphonium bromide (cas: 28322-40-9) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Formula: C23H26BrP

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary