Materials and Methods. All preparative reactions and isolations were performed under an atmosphere of purified nitrogen unlesa otherwise noted. Tetrahydrofuran (THF), toluene, benzene, and hexanes were obtained as reagent grade solvents and redistilled from sodium benzophenone ketyl under nitrogen. Dichloromethane was redistilled from P4O10, and NMR solvents were stored under nitrogen over 4 A molecular sieves. The anisyl-, phenetyl ...
