“…Palladium(II) acetate (Pd(OAc) 2 ), triphenylarsine ( L4 ), and 2,3-benzofuran were purchased from Sigma-Aldrich. Dichloromethane (CH 2 Cl 2 ), ethyl acetate (EtOAc), 2-thiophenecarboxaldehyde, magnesium turnings, and concentrated ammonia solution (28% NH 3aq ) were purchased from Nacalai Tesque, Inc. Tetrahydrofurane (THF, anhydrous), N , N -dimethylacetamide anhydrous (DMA), diethyl ether (ether), hexane, magnesium sulfate anhydrous (MgSO 4 ), ammonium chloride (NH 4 Cl), copper(I) iodide (CuI), pivalic acid (PivOH), and potassium carbonate (K 2 CO 3 ) were purchased from FUJIFILM Wako Pure Chemical Industry, Ltd. 1,3,5-Trimethoxybenzene, mesityl bromide, 2-bromotoluene, 4-bromotoluene, 2-bromoanisole, bromobenzene, 2-bromobenzotrifluoride, 4-bromobenzotrifluoride, 4-chlorobenzotrifluoride, 4-bromofluorobenzene, 2-propylthiophene, 2-methoxythiophene, methyl 2-thiophenecarboxylate, 2-phenylthiophene, 2-chlorothiophene, benzo[ b ]thiophene, 2-acetylthiophene, 2-isobutylthiazole, benzothiazole, 1-methyl-2-pyrrolecarboxaldehyde, furfural, 4-bromoanisole, 4-iodobenzotrifluoride, and tri( o -tolyl)phosphine were purchased from Tokyo Chemical Industry Co., Ltd. Arsenic ligands L1 - L2 , L7 - L9 , L11 , L3 , L5 - L6 , L12 - L13 , L10 , L14 , L16 - L20 , 2-(benzodithiaarsolyl)-2′,6′-dimethoxybiphenyl, L15 , 2-propylthiophene- d , 2-methoxythiophene- d , 2-dodecylthiophene, tris(o-trifluorotolyl)phosphine, and tris( p -trifluorotolyl)phosphine were prepared according to literature procedures.…”