| 摘要 |
(-)-6a, 10a-Trans-1-hydroxy-3-n-pentyl-6,6,9-trimethyl-6a,7,8,10a-tetrahydrodibenzo[b,d]pyran or any of its related pyrans in which the n-pentyl group is replaced by hydrogen or C1-C10 alkyl is isolated from a crude synthetic mixture by a process which comprises esterifying the mixture to form perfluorinated alkanoic acid esters, removing low-boiling and non-volatile components, passing the mixture through a first gas chromatographic column with a packing whose liquid phase consists of a slightly polar phenyl-substituted silicone oil and recovering a fraction rich in the desired component, passing the recovered fraction through a second gas chromatographic column with a packing whose liquid phase consists of a non-phenyl-substituted silicone oil and recovering a fraction rich in the desired component, hydrolyzing the fraction recovered from the second stage, and recovering the desired product from the hydrolysis mixture. |
