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.
![**Identify the Indicated Faces in the Molecules Below as Re or Si**
This diagram presents two molecular structures. In each, a central carbon atom is surrounded by different groups. The task is to identify the faces of these molecules along the directions labeled as "a" and "b," determining if they are Re or Si faces. Each option is selectable from a dropdown menu.
### First Molecule:
- **Structure:**
- Central carbon atom double-bonded to an oxygen atom (C=O).
- Bonded to a trichloromethyl group (Cl₃C) and an ethyl group (CH₂CH₃).
- Arrows indicate the directions labeled "a" and "b."
- **Dropdown Menu Options:**
- **Side a: [Select Re or Si]**
- **Side b: [Select Re or Si]**
### Second Molecule:
- **Structure:**
- Central carbon atom bonded to a methyl group (CH₃) and two hydrogen atoms (H).
- Bonded to an ester group (-O₂C-C).
- Arrows indicate the directions labeled "a" and "b."
- **Dropdown Menu Options:**
- **Side a: [Select Re or Si]**
- **Side b: [Select Re or Si]**
### Explanation:
The Re and Si notation is used to describe the two possible faces of a trigonal planar structure. These faces are determined based on the priority of the atoms/groups attached to the double-bonded carbon according to the Cahn-Ingold-Prelog (CIP) priority rules.
Understanding which face is which involves looking at the orientation of substituents and using these rules to assign priorities.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F40fdaaad-e26e-4582-b2cb-9dde3be8526f%2Fb6da86db-846a-4a8a-8d8d-f755b7611ad1%2F6c78tb9_processed.png&w=3840&q=75)
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