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.
Arrange the following carbocations in their correct order of stability. 1=Most stable and 4=least stable.
![The image displays four molecular structures, each representing a carbocation, which is a carbon atom with a positive charge, often indicated by a "+" symbol. Below each structure is an empty square, which may be intended for input or labeling purposes.
1. **Structure 1**: This is a cyclohexane ring with a carbocation indicated on one of the carbon atoms. A "+" symbol is placed adjacent to the ring, suggesting the presence of a positive charge.
2. **Structure 2**: A cyclohexane ring with a methylene group (CH2) attached to one of the carbon atoms. The carbocation is located at the CH2 group, as shown by the "+" symbol next to it.
3. **Structure 3**: A cyclohexane ring with a methyl group (CH3) attached. The positive charge is indicated on a carbon atom within the ring, as denoted by the "+".
4. **Structure 4**: A simpler structure with a methyl group (CH3) itself carrying the positive charge, represented by the "+" next to it.
Each structure depicts different types of carbocations, which play a crucial role in organic reactions. The empty squares below may serve as placeholders for further information, such as labeling the stability, reactivity, or application of each carbocation.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fadc447ea-4c16-4666-abc4-68a3d9e32223%2F94f5b129-2926-4d5d-9914-362bb5c21a85%2Fm18mtbr_processed.png&w=3840&q=75)
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