Reactive Intermediates
In chemistry, reactive intermediates are termed as short-lived, highly reactive atoms with high energy. They rapidly transform into stable particles during a chemical reaction. In specific cases, by means of matrix isolation and at low-temperature reactive intermediates can be isolated.
Hydride Shift
A hydride shift is a rearrangement of a hydrogen atom in a carbocation that occurs to make the molecule more stable. In organic chemistry, rearrangement of the carbocation is very easily seen. This rearrangement can be because of the movement of a carbocation to attain stability in the compound. Such structural reorganization movement is called a shift within molecules. After the shifting of carbocation over the different carbon then they form structural isomers of the previous existing molecule.
Vinylic Carbocation
A carbocation where the positive charge is on the alkene carbon is known as the vinyl carbocation or vinyl cation. The empirical formula for vinyl cation is C2H3+. In the vinyl carbocation, the positive charge is on the carbon atom with the double bond therefore it is sp hybridized. It is known to be a part of various reactions, for example, electrophilic addition of alkynes and solvolysis as well. It plays the role of a reactive intermediate in these reactions.
Cycloheptatrienyl Cation
It is an aromatic carbocation having a general formula, [C7 H7]+. It is also known as the aromatic tropylium ion. Its name is derived from the molecule tropine, which is a seven membered carbon atom ring. Cycloheptatriene or tropylidene was first synthesized from tropine.
Stability of Vinyl Carbocation
Carbocations are positively charged carbon atoms. It is also known as a carbonium ion.
![**Question 7: Rank the following enols in order of increasing stability:**
The image shows three structural diagrams of enols, labeled as I, II, and III.
1. **Structure I**:
- It is a six-membered ring with alternating double bonds and a hydroxyl group (OH) attached to the first carbon in the sequence.
2. **Structure II**:
- This is similar to Structure I, with a slight variation in the position of the double bonds. The hydroxyl group is present on the second carbon in a six-membered ring.
3. **Structure III**:
- Similar to the other two, it has a six-membered ring with alternating double bonds. The hydroxyl group is attached to the third carbon in the sequence.
**Task**: Identify the stability of each enol structure from least to most stable. Stability is typically influenced by factors like conjugation and hydrogen bonding.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F520f1756-5042-4fbb-a055-b7adc979077c%2Fc88390ba-5c3e-4bb2-9658-5c201486a031%2Fjanbmpa_processed.jpeg&w=3840&q=75)
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