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According to the classical mechanism,the reaction for generating dihalocarbene fromhaloform is a two-step process:X—CX_2—H:CX_2The above mechanism has been widely accepted and applied to some similar reactions al-though evidence remained unknown.No exception was claimed as far as we know.When the mixture of bromoform and chloroform was used to react with sodium hydroxidein the presence of olefins under ultrasonic irradiation,we found unexpectedly that theproducts from all the reactions were the following three gem-dihalocyclopropanes.
According to the classical mechanism, the reaction for generating dihalocarbene fromhaloform is a two-step process: X-CX_2-H: CX_2The above mechanism has been widely accepted and applied to some similar reactions al-though evidence was unknown. No exception was claimed as far as we know. Who the mixture of bromoform and chloroform was used to react with sodium hydroxidein the presence of olefins under ultrasonic irradiation, we found unexpectedly that theproducts from all the reactions were the following three gem-dihalocyclopropanes.