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.
![**Exercise: Carbocation Stability**
**Objective:**
Label the *most stable* and the *second most stable* carbocation.
**Diagram Explanation:**
The image presents four different carbocations, each represented by a chemical structure with a positive charge (+) indicating the carbocation site. The structures are:
1. Cyclohexane ring with a positive charge on one carbon atom.
2. Cyclohexene ring with a positive charge on one carbon atom.
3. A linear carbon chain with three carbon atoms and a positive charge on the middle carbon.
4. A branched carbon chain with three carbon atoms, featuring a positive charge on the secondary carbon.
**Page Information:**
- Page 12 of 17
**Instructions:**
Analyze the given carbocations and determine their relative stability. Consider factors such as hyperconjugation, inductive effects, and resonance, which may contribute to the stability of carbocations.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2c8842d9-b1ee-42eb-92f9-68b294ddc2b9%2F49b0b43d-7624-4218-af95-66a0fffc86db%2Fiv57lid_processed.jpeg&w=3840&q=75)
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