LiOPh; 1,3-dimethyl-1H-benzo[d]imidazol-3-ium iodide in acetonitrile-D3 T=25°C; 28 h; also pyrolysis;

With  LiOPh; 1,3-dimethyl-1H-benzo[d]imidazol-3-ium iodide in  N,N,N',N',N'',N''-hexamethylphosphoric triamide T=25°C; 28 h;