Consider the reaction below: D HBr The final product of this reaction has [Select] and may form a total of [Select ] stereocenters, stereoisomers.
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.
\[ \text{D} \quad \text{D} \quad \ce{HBr} \rightarrow \]
where D represents deuterium.
This reaction involves the addition of HBr to an alkene.
**Question:**
The final product of this reaction has [Select] stereocenters, and may form a total of [Select] stereoisomers.
**Explanations:**
- Stereocenters are atoms in a molecule that have attachments which can be arranged in space in multiple ways that are not superimposable.
- Stereoisomers are molecules that have the same connectivity but different spatial arrangements of atoms, leading to different chemical and physical properties.
To determine the number of stereocenters and stereoisomers, analyze the molecular structure of both the reactants and products.
**Note:**
For educational purposes, it's important to understand the concept of stereochemistry and how it affects molecular interactions. Explore these topics further to have a comprehensive understanding of how stereochemistry impacts reactions, such as the addition of HBr to alkenes.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F61e08100-95fd-4f62-9899-841872b9b376%2F3eed640a-c86e-4f5d-b49b-433dfc78c7ae%2Fh1rkx49_processed.jpeg&w=3840&q=75)
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