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3-Bromo-3-fluorotricyclo[3.3.0.0 2,4 ]octane (8) was prepared by addition of bromofluorocarbene to bicyclo[3.2.0]hept-6-ene (5). Treatment of a solution of 8 in ether with MeLi in the presence of furan afforded the trapping product 11. The formation of the trapping product is consistent with the first generation of a five-membered ring allene, namely, 2-dehydro-3a,4,5,6,6a-pentahydropentalene...
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