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Allylidenecyclopropane, readily available from 1-lithio-1-(phenylthio)cyclopropane, reacts with a large variety of electrophilic olefins and produces functionalized spirooctenes. The reactions are, in most cases, highly regioselective but lead mainly to the unexpected regioisomers.
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Zutterman et al. (1983) studied this question.
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