Any effective catalyst known to those skilled in the art may be used.The reaction can be carried out either with or without a solvent, preferably in a solvent and illustrative of the many solvents suitable for use in this synthesis one can name the alcohols, tetrahydrofuran, acyclic ethers, and conventionalacetate esters.The preferred solvents are the alcohols such as isopropyl alcohol or t-butyl