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.
Illustrate the Electrophilic Addition of H2O to an
The electrophilic addition reaction is a type of organic reaction in which the electrophile attacks the substrate initially and then followed by the addition of nucleophile. The addition reactions mainly occur in the unsaturated compounds. The addition of H2O is an example of electrophilic substitution reaction.
The addition of water to alkenes in the presence of strong acid gives alcohols as products. The reaction involves a carbocation intermediate and the mechanism also obeys Markovnikov rule.
The mechanism involves the addition of hydrogen ion cleaving the double bond and forming the carbocation. The carbocation then reacts with water molecules (acid-base reaction) leading to the formation of oxonium ion. The deprotonation of the oxonium ion gives the corresponding alcohol.
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