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Oxidation of tricyclic sesquiterpenoids of the caryophyllene type with the HBr—DMSO system afforded ,-unsaturated -bromoketones. Since tricyclic derivatives, unlike simple alicyclic ketones, cannot undergo aromatization, all intermediate oxidation products can be isolated, which provide evidence that oxidation proceeds according to the following scheme: ketone-bromoketone,-dibromoketone,-unsaturated -bromoketone. 相似文献
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