(Solved): 10. An aryne-ene reaction has been reported and evidence supports it as a pericyclic reaction [59] ...

10. An aryne-ene reaction has been reported and evidence supports it as a pericyclic reaction [59]. Write a mechanism for the reaction below. When the allylic methyl groups are substituted with deuterium, greater than \( 95 \% \) deuterium transfer is observed. How does this support the conclusion that the reaction is concerted? \( \underset{\text { THF, rt }}{\stackrel{\text { LDA }}{\longrightarrow}} \)