Rank the dienes by DECREASING REACTIVITY in Diels-Alder reactions (most reactive on the left). CN CH3 OCH3 II III IV O A. V > IV > || > | > ||| O B. V > || > [l| >|> ]V O C. IV > 1 > || > ||| > V O D. II > III > V >[ > IV O E. V > III > I| > | > IV
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.
![Rank the dienes by DECREASING REACTIVITY in Diels-Alder reactions (most reactive on the left).
CN
CH3
OCH3
II
II
IV
O A. V > IV > || > | > ||
O B. V > || > NIl > | > IV
O C. IV > T > I| > ||| > V
O D. II > |II > V >[ > ]V
O E. V > III > I|| > | > IV
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