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!
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
The Favorskii rearrangement is a base-promoted skeletal rearrangement of α-halo ketones possessing at least one α-hydrogen. Treatment with base in the presence of a nucleophile (such as alcohols, amines, or water) results in a rearrangement via a cyclopropanone intermediate, ultimately … Read more
Norbornane is a bicyclic compound (bicyclo[2.2.1]heptane) with a rigid, saturated framework. Norbornene is its corresponding alkene, containing a double bond that makes it reactive toward typical electrophilic addition reactions. Norbornanone is a ketone derivative, where the carbonyl group undergoes nucleophilic … Read more
We have seen in the previous post that crossed aldol reactions allow us to prepare β-hydroxy carbonyl compounds by reacting an enolate (formed from one carbonyl compound) with another aldehyde or ketone, followed by protonation. A nice variation/type … Read more
In Knoevenagel condensation, we take a molecule where a methylene (CH2) is connected to (preferably) two electron-withdrawing groups, so we can deprotonate it and react with an aldehyde or a ketone. This allows the formation of a carbon-carbon double bond … Read more
In the previous post, we discussed different methods for converting alcohols to alkyl halides, including their reaction with hydrohalic acids, the use of mesylates and tosylates, as well as reagents such as thionyl chloride (SOCl2) and phosphorus tribromide (PBr3). … Read more
Fentanyl is a potent synthetic opioid widely used for pain management and anesthesia. Structurally, it is a phenylpiperidine derivative, featuring a substituted aniline ring, a piperidine heterocycle, and an amide linkage connecting the key fragments. Its biological activity arises from … Read more
