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.
![### Reaction Analysis and Instructions for Organic Chemistry:
#### Problem Statement
**Draw the product(s) of the following reactions:**
Starting Material:
\[ \text{CH}_3\text{CH}_2\text{CH}_2\text{C}\equiv \text{C}-\text{H} \]
Reagents and Conditions:
1. \( \text{BH}_3 / \text{THF} \)
2. \( \text{H}_2\text{O}_2 / \text{aqueous NaOH} \)
#### Guidelines
- **You do not have to consider stereochemistry.**
- **Separate multiple products using the + sign from the drop-down menu.**
- **You do not have to explicitly draw H atoms.**
- **If no reaction occurs, draw the organic starting material.**
#### Drawing Tool
- The provided interface for drawing your chemical structure is powered by ChemDoodle®.
#### Steps:
1. Utilize the toolbar on the drawing interface to create your chemical structures.
2. Keep in mind that the relations must proceed as per the given conditions, in this case, hydroboration-oxidation which results in the formation of an organoborane intermediate followed by oxidation to give an alcohol.
In this particular reaction:
- Hydroboration of an alkyne typically results in the formation of a vinyl borane intermediate.
- Subsequent oxidation with hydrogen peroxide in the presence of NaOH transforms the vinyl borane to an aldehyde or ketone, depending on the alkyl group attached.
#### Drawing Interface Description:
- Various tool options are provided:
- **Hand tool** for selecting structures.
- **Template tools** to choose common organic structures.
- **Drawing tools** including bonds, atoms, and electron pairs.
- **Erase tool** to correct mistakes.
- **Zooming tool** for better visibility.
- The **Chemistry Font tool** that includes various chemical symbols and structures.
For any questions on using the drawing tools, the **question mark icon (?)** can be clicked to access help and more detailed instructions.
Once your drawing is complete, click on the ‘remove’ button to finalize and check your drawn structure.
*Note: The reaction specified involves hydroboration-oxidation, a common method for converting alkynes into aldehydes.*](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F94f2b720-6c17-4283-96f9-864e0b1ece0e%2F62ecfc96-28c0-4778-afec-e6b63bba606a%2Fy28zi1i_processed.png&w=3840&q=75)
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