| 摘要 |
<p>A new composition of matter comprising the pure crystalline gamma -lactone of plicatic acid (i.e., crystalline plicatin) is prepared. The new processes for preparing this crystalline plicatin comprise dissolving crystalline plicatic acid tetrahydrate in an excess of an inert, neutral solvent, heating the resulting solution and then rapidly cooling the solution whereupon pure crystalline plicatin is obtained. Acid catalysts in catalytic amounts may be incorporated into the plicatic acid-solvent solution.</p> |
