An unusual anionic rearrangement in the (CH)10 series

Abstract
Reaction of an excess of methyl-lithium with the tosylhydrazone of tricyclo[5,3,0,02,10]deca-3,5-dien-9-one affords tetracyclo[4,4,0,02,10,05,9]deca-3,7-diene, whereas reaction with 2 equiv. of methyl-lithium gives tricyclo[5,3,0,04,10]deca-2,5,8-triene.

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