4. (2 E) A [3,3] sigmatropic rearrangement that facilitates C-N bond formation was developed by Overman in the 1970s. Predict the product which results from heating compound B and propose a mechanism starting from compound B to explain the formation of the proposed product. ... OH A R CCI3CN DBU CCI 3 B NH R 90 °C
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.
![4. (2 E) A [3,3] sigmatropic rearrangement that facilitates C-N bond formation was
developed by Overman in the 1970s. Predict the product which results from heating
compound B and propose a mechanism starting from compound B to explain the
formation of the proposed product.
...
A
R
CCI3CN
DBU
CCI3
῾ΝΗ
B
R
90 °C](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F898daafe-5ebf-4b95-bbd3-4268554435b0%2F7a15ed60-32b6-44f4-9283-7cd9c648e1fe%2Fmazt93o_processed.jpeg&w=3840&q=75)
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