Ethyltriphenylphosphonium bromide

Chemical properties

White to off-white crystalline powder

The Uses of Ethyltriphenylphosphonium bromide

Ethyltriphenylphosphonium Bromide (ETPB) is a phase transfer catalyst, used to accelerate the cure of phenolic-based epoxy resins, certain fluoroelastomer resins and thermosetting powder coatings. It is also used as catalysts in the synthesis of certain organic compounds and as a pharmaceutical intermediate.

1. Ethyltriphenylphosphonium bromide acts as a reactant in the synthesis of D-amino acids from L-cysteine-derived thiazolidines, Leiodolide A through aldol reactions and Horner-Wadsworth-Emmons olefination.
2. It is also used in the preparation of cycloalkanoindolines through diastereoselective intramolecular inimo-ene reactions.
3. it is used as a reagent in solid-state metathesis polycondensation to prepare alkyl-dipropenylthiophene monomers.
4. Mizoroki-Heck cyclization and cascading Tsuji-Trost cyclization reactions.

Description

Ethyltriphenyl phosphonium bromide (ETPB) is a white to off-white crystalline powder used as a phase-transfer catalyst in the production of epoxy resins and powder coatings, and as a pharmaceutical intermediate.

Purification Methods

Recrystallise it from H2O and dry it in high vacuum at 100o. IR has bands at 1449, 1431 and 997cm-1 . [Wittig & Wittenberg Justus Liebigs Ann Chem 606 1 1957, Bergmann & Dusza J Org Chem 23 1245 1958, Beilstein 16 IV 982.]