PREPARATION AND CHARACTERIZATION OF 1-VAN ADO-11-MOLYBDOPHOSPHORIC ACID AND ITS ALKALINE-SALTS

The 1-vanado-11-molybdophosphoric acid and its related alkaline salts are very efficient in the oxydehydrogenation of isobutyric acid into m ethacrylic acid. However, their stereospecific synthesis and their ide ntification are still in discussion. This prompted us to work out a se lective method of synthesis of the acid parent and its salts as weil a s appropriate methods for their identification. The characterization h ave been carried out by IR spectroscopy and XRD hi the solid state, an d by protometric titrations, polarography, UV spectroscopy and P-31 an d V-51 NMR in solution.