n-BuMnMgBr in tetrahydrofuran; N,N,N',N',N'',N''-hexamethylphosphoric triamide T=25°C; Rearrangement; 12 h;

1: n-butyl-magnesium bromide With N,N,N',N',N'',N''-hexamethylphosphoric triamide; manganese (II) chloride in tetrahydrofuran T=0°C; 0.333333 h; 2: 3-(Tetrahydropyran-2-yloxy)-1-trimethylsilyl-1-butyne in tetrahydrofuran T=0 - 25°C; 23 h;