0.02 N, better results are obtained by dissolving the weighed amount of the acid in a known volume of potassium methoxide and back titrating the excess with standard oxalic acid solution in the same solvent because the colour change at the end point is sharper from alkaline to the acid medium...
Careful acidic hydrolysis of these ketalised products with a 10% aqueous solution of oxalic acid leads to the expected ketones 4 , 9 and 13 , respectively.doi:10.1002/chin.199734096Abderrazak Bachki +Francisco FoubeloMiguel YusJohn Wiley & Sons, Ltd.Tetrahedron...