Several 8-oxabicyclo[3.2.1]oct-6-en-3-one
derivatives have been prepared via the [3 + 4]
cycloaddition
between the oxyallyl carbocation generated from polybromoketones and
alkylfurans. The selective
effects of these compounds on the radicle growth of a monocotyledon
[sorghum (Sorghum bicolor
L.)] and a dicotyledon [cucumber (Cucumis sativus
L.)] were evaluated. All of the test compounds,
at the concentration of 100 μg mL-1,
stimulated cucumber root growth (5−30%), but they
inhibited
sorghum root growth (23−56%). None of the compounds had any
effect on the percent of germination
of the species tested.
Keywords: Plant growth regulators; oxyallyl cation; cucumber;
sorghum