... Tetrahedron. Volume 69, Issue 21, 27 May 2013, Pages 4236–4240. Cover image Cover image. ... Combinations of DMF+NH 3 , 20 DMSO+NH 4 HCO 3 , 21 and DMF+NH 4 HCO 3 , 22 providing 'C' and 'N', respectively, can also be efficiently used for cyanation of Ar–H or Ar–X. ...