Unless otherwise noted, reagents were purchased from Tokyo Chemical Industry Co., Ltd., Sigma-Aldrich Co., LCC, FUJIFILM Wako Pure Chemical Co., and other commercial suppliers and were used as received. Anhydrous tetrahydrofuran, toluene, and dichloromethane were purchased from KANTO Chemical Co., Inc. and purified prior to use by a solvent purification system (GlassContour) equipped with columns of activated alumina and supported copper catalyst. Fe(acac)3 (99.9% trace metal basis) was purchased from Sigma-Aldrich Co., LCC, and used as received. Xylene was purchased from FUJIFILM Wako Pure Chemical Co., degassed by Freeze-5