w . { 14. The 15. man for the She theme de final product of the following the west be The done, the first comportaron por besonders and the edhe electroniche to the other. This meaning the LUMO The east of the versedectron-demandes de reci b) A double (2 steps) rearrangement. (Stopping after the first rearrangement would not be good-it wants to be aromatic again.) 14. Predict the product and show an arrow.pushing mechanism for the following transformation. This transformation is a Diels-Alder reaction, followed by a retro-Diels-Alder reaction. feat 15. Show a mechanism for the following key step in the synthesis of the cytotoxic compound chelidonine. 120c 16. Give the intermediate and the final product of the following sequence. The intermediate is unstable and cannot be isolated. The diene, the first compound, is electron poor because of both the nitrogens and the ester, and the dienophile is electron rich due to the ether. This is backwards, meaning the LUMO of the diene reacts with the HOMO of the dienophile, a reverse-electron-demand Diels-Alder reaction