7. Determine if the following will follow an E2 or El pathway. Since base strength plays such a pivotal role in an E2 process, a strong base will favor the E2 pathway. Since the base does not play a crucial role in the El process, a weak base will favor the El pathway. Br NaOH H3C I H H3C (stronger base) H. E2 - anti-periplanar geometry is required Br H3C I H20 (weaker base) H3C © H- H3C. H E1 - Zaitsev control because base is non-bulky intermediate cation does not require anti-periplanar geometry
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.
![7. Determine if the following will follow an E2 or El pathway. Since base strength plays such a pivotal
role in an E2 process, a strong base will favor the E2 pathway. Since the base does not play a crucial
role in the El process, a weak base will favor the El pathway.
Br
NaOH
H3C
H
H3C
(stronger base)
E2 - anti-periplanar
geometry is required
H20
(weaker base)
Br
H3C
H
H3C ©
H
H-
H3C
'H.
E1 - Zaitsev control
because base is non-bulky
intermediate cation does not
require anti-periplanar geometry](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa78be049-a055-4ff5-8f71-f33c2a4a40f9%2F508f8e62-bd16-45cc-b6db-344ae0f485c6%2Fhfsgke_processed.jpeg&w=3840&q=75)
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