The only way of mastering any topic in Organic Chemistry is doing lots of practice problems. And I know, seeing my students, that starting to work on a practice problem may be the hardest part as you don’t know where to start. It is difficult to visualize what where the double bond would be moved if you follow the five curved arrows crammed in one step. Here is the trick:
We are always told to think before doing something. Fair enough. But let me tell you, it is also strangely enough, that in Organic Chemistry, it is often better to draw and then think about what you did (not in the lab though). It is much easier to have a structure in front of you and check for errors and improvements.
Do the first step, take the pencil and you will see that the ball gets rolling.
You have all these Organic Chemistry Practice Problems waiting to be solved!
We have seen earlier that esters react with two equivalents of Grignard reagent to form tertiary alcohols after acidic workup. The reaction occurs through two successive nucleophilic additions: the first addition forms a tetrahedral intermediate that collapses by expelling the … Read more
We have seen that amides can be hydrolyzed to carboxylic acids and amines under acidic or basic conditions. Lactams are cyclic amides, and the amino and carboxyl groups are part of the same molecule; therefore, the products of … Read more
We have seen that the reduction of lactones with LiAlH₄ proceeds through ring opening and ultimately gives diols after two consecutive hydride additions. A very similar hydride reduction can also be applied to lactams, although the outcome and key mechanistic … Read more
We have seen that esters can be reduced to alcohols by lithium aluminum hydride (LiAlH₄) through two consecutive additions of hydride ions to the carbonyl carbon. The mechanism starts with nucleophilic attack of hydride on the ester carbonyl, … Read more
Introduction to Lactams Lactams are cyclic amides, and they are classified according to the size of the ring containing the amide group. The naming uses Greek letters that indicate how many carbon atoms lie between the nitrogen and the carbonyl … Read more
We have seen how aryl ketones are prepared by the Friedel-Crafts acylation when benzene or other aromatic compound derivatives are reacted with acid chlorides in the presence of Lewis acids such as AlCl3. Now, when highly activated benzene … Read more
Let’s talk about the retro Diels-Alder reaction. In simpler words, this is the reverse of a given Diels-Alder reaction, which we are mainly going to need for identifying the starting materials that reacted in a particular Diels-Alder reaction. If you … Read more
In this comprehensive set of practice problems, we will work through examples of Diels–Alder reactions that include both normal and retro Diels-Alder cases, as well as variations in regioselectivity and stereoselectivity. We will also look at endo and exo selectivity, … Read more
We have seen that in the Diels-Alder reaction, the electrons flow in a cyclic, concerted manner. Therefore, the Diels-Alder reaction is classified as a pericyclic reaction, a class of reactions that proceed through a cyclic transition state with no intermediates. … Read more
We know that esters undergo different types of condensation reactions when their enolate are formed upon reacting with strong bases. The most common ones are the Claisen, Dieckmann, and also the crossed aldol condensation, where the enolate of the ester … Read more
