... and two two-proton doublets (J = 9 Hz) at 6 7.08 (H2,6) and 8.0 (H3,J for the aromatic protons ... a-Keto mesylates are relatively common in synthetic organic chemistry Since their main utility has been as a reactive intermediate in ... 1) British Patent 899995 and 899996, 1962; Chem. ...