7. a) A) In the box below the arrow, label if the peric_ Electrocyclic (EC) or Sigmatropic Rearrangement (SR). heat HO₂C b) heat c) + NO2 1. Na, NH3 2. heat NO2
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.
a)
A) In the box below the arrow, label if the pericyclic reaction is a Diels Alder (DA),
Electrocyclic (EC) or Sigmatropic Rearrangement (SR). B) Determine the major product(s).
heat
HO₂C
b)
heat
to
c)
+
1. Na, NH3
NO2
NO2
2. heat](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F278f483f-6423-47c6-8e1d-cd6173403fdd%2F05553133-9cc8-4437-bec8-6cdb45800fcf%2Fhl87osp_processed.png&w=3840&q=75)
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