10- Mention how a halogen substituent can be replaced by a deuterium atom in the preparation of a deuterated compound. Br | CH3CHCH₂CH3 ? D I CH3CHCH₂CH3
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.
![1- Write Walden's Cycle of Reactions Interconverting.
2- Mention the product of a nucleophilic substitution reaction of (S)-2-
bromohexane with acetate ion, CH3CO2-
Assume that inversion of configuration occurs, and show the chemistry
of both the reactant and product.
3- Draw the mechanism of the SN2 Reaction. Show the correct directions
of the arrows, and all reagents.
4- Draw the mechanism of the SN1 Reaction. Show the correct directions
of the arrows, and all reagents.
5- Draw the mechanism of the E2 Reaction with an Alkyl Halide. Show
the correct directions of the arrows, and all reagents.
6- Draw the mechanism of the E1 Reaction with an Alkyl Halide. Show
the correct directions of the arrows, and all reagents.
7- Mention the product formed in an SN2 reaction between 1-
bromobutane and Nal.
8- Rank the following compounds in order of their expected reactivity
toward SN2 reaction: CH3Br, CH3OTOs, (CH3)2CHC1.
9- Explain Grignard Reagents in details with one example.
10- Mention how a halogen substituent can be replaced by a
deuterium atom in the preparation of a deuterated compound.
Br
|
CH3CHCH₂CH3
?
D
|
CH3CHCH₂CH3](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F389450d8-f111-499a-811c-3e6b049ffcf7%2F8f24b43a-20fd-4c41-91ef-91ccd4baeb89%2F5qv2xja_processed.jpeg&w=3840&q=75)
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