Question: A compound known as Hagemann's ester can be prepared by treating a mixture of formaldehyde and ethyl acetoacetate first with base and then with acid

A compound known as Hagemann's ester can be prepared by treating a mixture of formaldehyde and ethyl acetoacetate first with base and then with acid and heat. Write the structure for the product of each of the steps.
a. The first step is an aldol-like condensation.
b. The second step is a Michael addition.
c. The third step is an intramolecular aldol condensation.
d. The fourth step is a hydrolysis followed by a decarboxylation.

COCH CH Hagemann's ester

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