The author of 《Palladium-Catalyzed Dialkylation of C-C Triple Bonds: Access to Multi-Functionalized Indenes》 were Liu, Xiao-Wei; Li, Shu-Sen; Dai, Dong-Ting; Zhao, Meng; Shan, Cui-Cui; Xu, Yun-He; Loh, Teck-Peng. And the article was published in Organic Letters in 2019. SDS of cas: 1530-32-1 The author mentioned the following in the article:
A palladium-catalyzed dialkylation of 1,3-dien-5-ynes was developed using alkenyl double bonds as the initiator and terminator for the synthesis of functionalized indene derivatives The reactions were performed under mild reaction conditions, affording the corresponding multi-substituted indene derivatives in high efficiency via unprecedented 5-endo cyclization and alkylation processes. The substituent location at the alkenyl double bond was essential for the chemoselective synthesis of the indene and naphthalene derivatives, resp. In addition to this study using Ethyltriphenylphosphonium bromide, there are many other studies that have used Ethyltriphenylphosphonium bromide(cas: 1530-32-1SDS of cas: 1530-32-1) was used in this study.
Ethyltriphenylphosphonium bromide(cas: 1530-32-1) is a phase transfer catalyst, used to accelerate the cure of phenolic-based epoxy resins, certain fluoroelastomer resins and thermosetting powder coatings. CatOnium ETPB is also used as catalysts in the synthesis of certain organic compounds.SDS of cas: 1530-32-1
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary