7. For the following reactions of dienes, please draw the 1,2-product and the 1,4-product. Also, please choose one reaction to draw the reaction mechanisms highlighting how both addition products are formed. 1. H3C CH3 1,2-Product 1,4-Product HBr (1 eq) 2. + Br, (1 eq) 12-Product 1,4-Product 3. 12-Product 1,4-Product + HBr (1 eq.) 4. CH2 + Br2 CH2 (1 eq) 12-Product 1,4-Product
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. For the following reactions of dienes, please draw the 1,2-product and the 1,4-product. Also,
please choose one reaction to draw the reaction mechanisms highlighting how both addition
products are formed.
1.
H3C
CH3
1,2-Product 1,4-Product
HBr (1 eq)
2.
+ Br2
(1 eq)
1,2-Product
1,4-Product
3.
12-Product 1,4-Product
+ HBr (1 eq.)
4.
CH2
+ Br2
CH2 (1 eq)
12-Product
1,4-Product](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1e3e2134-96fc-4452-a677-73870439788a%2Ff2d2fc39-aaa4-434b-a75c-2003d7557c93%2Fer666nv_processed.jpeg&w=3840&q=75)
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