E 1663 (OTTO) Ethyltriphenylphosphonium bromide, 99% Cas 1530-32-1 - used in the preparation of cycloalkanoindolines through diastereoselective intramolecular inimo-ene reactions. E 1663 (OTTO) Ethyltriphenylphosphonium bromide, 99% Cas 1530-32-1 - used as a reagent in solid-state metathesis polycondensation to prepare alkyl-dipropenylthiophene monomers and Mizoroki-Heck cyclization and cascading Tsuji-Trost cyclization reactions.