Destroyer OChem question 103

[nk137s]

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I didn't understand # 103. It says that it is a Claisen reaction with an alpha hydrogen in base but H3O+ is clearly an acid. Can someone please clarify this question for me.
Thanks!

 

[Mstoothlady2012]

I didn't understand # 103. It says that it is a Claisen reaction with an alpha hydrogen in base but H3O+ is clearly an acid. Can someone please clarify this question for me.
Thanks!

I think he is talking about ethoxide...