1: C20H20OP(1+)*I(1-) With N,N,N',N',N'',N''-hexamethylphosphoric triamide; sec.-butyllithium in tetrahydrofuran; pentane T=-78°C; Wittig reaction; Inert atmosphere; 2: 4-methoxy-benzaldehyde in tetrahydrofuran; pentane T=-78 - 20°C; Wittig reaction; Inert atmosphere;

1: C20H20OP(1+)*I(1-) With N,N,N',N',N'',N''-hexamethylphosphoric triamide; sec.-butyllithium in tetrahydrofuran; pentane T=-78°C; Wittig reaction; Inert atmosphere; 2: piperonal in tetrahydrofuran; pentane T=-78 - 20°C; Wittig reaction; Inert atmosphere;

1: C20H20OP(1+)*I(1-) With N,N,N',N',N'',N''-hexamethylphosphoric triamide; sec.-butyllithium in tetrahydrofuran; pentane T=-78°C; Wittig reaction; Inert atmosphere; 2: 4-methoxy-benzaldehyde in tetrahydrofuran; pentane T=-78 - 20°C; Wittig reaction; Inert atmosphere;

1: C20H20OP(1+)*I(1-) With N,N,N',N',N'',N''-hexamethylphosphoric triamide; sec.-butyllithium in tetrahydrofuran; pentane T=-78°C; Wittig reaction; Inert atmosphere; 2: piperonal in tetrahydrofuran; pentane T=-78 - 20°C; Wittig reaction; Inert atmosphere;