PNNL

Abstract

All reactions were performed using standard Schlenk techniques under an atmosphere of pre-purified argon. Dibenzofuran (= 99%) was purchased from Aldrich and sublimed in a cold finger prior to use. Bromine (99.5+%), chlorodiphenylphosphine (PPh2Cl, 98%), n-butyllithium (n-BuLi, 2.5 M sltn. in hexanes) and chloroform-d (CDCl3) were purchased from Aldrich and used without further purification. Methylene chloride, methanol, ethyl acetate, hexanes and anhydrous tetrahydrofuran (THF) were purchased through VWR and used without further purification. Methylene chloride for phosphorescent studies and chloroform for the bromination reaction were purchased from Fisher, distilled over CaH2 under argon, and deoxygenated by 3 freeze-pump-thaw cycles before use.