Double Proton Tautomerism via Intra- or Intermolecular Pathways? The Case of Tetramethyl Reductic Acid Studied by Dynamic NMR: Hydrogen Bond Association, Solvent and Kinetic H/D Is... oleh Hans-Heinrich Limbach, Simone Baumgärtner, Roland Franke, Ferdinand Männle, Gerd Scherer, Gleb S. Denisov