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What is the major product of the reaction between 1,1-dibromo-2-(pent-4-en-1-yl)cyclopropane and methyllithium in diethyl ether?

reaction between 1,1-dibromo-2-(pent-4-en-1-yl)cyclopropane and methyllithium in diethyl ether

I suppose the nucleophilic double bond will react with the electrophilic carbon, but I cannot figure out how the second bromine atom will be substituted. I cannot find anywhere what MeLi is being used for in this reaction.

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    $\begingroup$ The MeLi does a metal-halogen exchange and I think you are going to generate a carbene $\endgroup$
    – Waylander
    Commented Jun 30 at 13:47
  • $\begingroup$ @Waylander Thanks, Wikipedia(en.wikipedia.org/wiki/Carbene) also seems to suggest that. It also gives the correct final product for my reaction. $\endgroup$
    – Eisenstein
    Commented Jun 30 at 16:14

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