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.
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![### Task
Draw a structural formula for the **more stable** carbocation intermediate formed in the reaction shown.
#### Reaction
\[ \text{CH}_3\text{CH}_2\text{C}=\text{C}(\text{H})\text{CH}_2\text{CH}_3 \, + \, \text{HBr} \rightarrow \]
### Guidelines
- **Do not consider stereochemistry** in your structural formula.
- **Exclusion of anionic counter-ions**: Do not include anionic counter-ions, such as \(\text{I}^-\), in your response.
- **Multiple stable carbocations**: If multiple carbocations with similar stability are possible, **draw all possible structures**.
- **Instructions for using the sketcher**:
- Draw one structure per sketcher.
- To add additional sketchers, use the drop-down menu located in the bottom right corner of the interface.
- Use **plus signs (\(+\))** from the drop-down menu to separate different structures.
### Diagram Tools
There are a variety of tools available within the diagram interface to assist you in creating the structural formulas. Make use of these tools to ensure clarity and accuracy in your representation.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5888bae3-212e-47ed-9890-15c9dff3400f%2F4e7a05e1-f94d-4cc8-a1cc-3000a94bb203%2Fkce5aq_processed.png&w=3840&q=75)
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