ChemInform Abstract: Preparation and Characterization of New C2‐ and C1‐Symmetric Nitrogen, Oxygen, Phosphorous, and Sulfur Derivatives and Analogues of TADDOL. Part 3. Some New Chiral Broensted Acids for Organocatalysis and pKa Values in MeO—(CH2)2—OH/H2O — A Survey. Issue 5 (13th February 2013)