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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### Chapter 7a
**Question 10 of 13**
#### Question:
(b)
[Image showing a chemical reaction]
The structure on the left side displays a linear molecule with a bromo substituent. On the right side, a reagent, specifically t-BuOK (tert-butoxide potassium), is indicated, with a question mark representing the unknown product.
**Diagrams:**
- **Reactant Structure**: A chain of four carbon atoms with a bromine (Br) atom attached to one of the internal carbon atoms.
- **Reagent**: t-BuOK (tert-butoxide potassium).
**Interactive Element:**
- "Edit Drawing" button located under a separate structure (a cyclic compound showing \[H\]—\[C\]—\[O\] bonds) allows for interactive engagement.
**Resources:**
- **eTextbook and Media**: Additional resources available.
- **Hint**: Option to access hints for problem-solving.
**User Interaction:**
- Feature to "Save for Later" for continuous assessment.
**Attempts**: 2 of 3 allowed attempts have been used.
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This transcription should aid in understanding the structure and interaction of the problem presented in the image, guiding learners through the chemical concepts.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0d1252b7-3842-40b9-8067-b3d263062e77%2F18da9935-0b3e-41c9-ba69-63c3aca5b711%2Fxqjgeak_processed.jpeg&w=3840&q=75)
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