In the synthesis of the keto acid just given, the dicarboxylic acid decarboxylates to give the product shown below at the left, and not the one shown at the right. Explain. взамини вва OH rather than OH
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- The following reaction is an example of a "thiol/ene" Michael reaction. It's commonly used to modify polymers as shown below. Provide a mechanism. Triethylamine is used as a base.In the below sequence of reactions, A and B are which of the following?(b) How would you carry out the following synthesis to prepare the target molecule? + CH3 ??? HO Target molecule
- Which of A to E correctly shows the structure of the major organic product obtained using an excess of reagents in the reaction sequence shown below?During electrophilic aromatic substitution, a resonance-stabilized cation intermediate is formed, Groups, already present on the benzene ring, that direct ortho/para further stabilize this intermediate by participating in the resonance delocalization of the positive charge. resonance Assume that the following group is present on a benzene ring at position 1 and that you are brominating the ring at positon 4. In the box below draw the structure of the rese contributor that shows this group actively participating in the charge delocalization. H₂C • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. . Do not include lone pairs in your answer. They will not be considered in the grading.A useful way to synthesize alkaloids is called the Pictet-Spengler synthesis. The first two steps of the synthesis are shown below. The first step involves a nucleophilic attack, and the second step is a typical elimination reaction. Provide a reasonable mechanism using curved arrows for both reactions.