In the first step, acetoacetic ester is deprotonated and might then function a nucleophile and attack the alkyl halide. Immediately after this, the ester is then hydrolyzed to a carboxylic acid which then loses carbon dioxide via a nicely organized 6-membered transaction condition: It's important to do not forget that https://eduardopxdhk.mdkblog.com/38659277/detailed-notes-on-thc