Abstract
Ten derivatives (II-VI and VIII-XII) from 2, 5-dihydroxy-1, 4-dithiane (I) and 2, 5-dihydroxy-2, 5-dimethyl-1, 4-dithiane (VII) showed inhibitory activity against the growth of root of Brassica rapa L. The inhibitory activity of all ten derivatives was higher than that of the original compounds I and VII. In particular, VIII-XII inhibited the germination of this plant at the concentration of 1.0×10-3M. Among the derivatives VIII-XII, IX exhibited the strongest inhibition. Compound III had the most potent inhibitory activity among the derivatives II-VI. The results indicate that acylation of hydroxyl group with propionic acid enhances the activity. The inhibitory effect of VIII-XII was much stronger than that of II-VI. The findings suggest that methyl groups at 2, 5 dipositions play an important role in the inhibitory activity of 2, 5-dihydrosy-1, 4-dithiane-related compounds. In both derivatives II-VI and VIII-XII, the inhibitory effect of the substituent was in the order of propionyl > acetyl > butyryl > valeryl > isobutyryl. All radicles of this plant treated with the compounds I-XII showed negative geotropism.
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