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.
Assign priorities to these set of Substituents
a) -CH2CH2OH,-Br,-H, -CH2CH3
b) -COOH,-COOCH3,-CH2OH,-OH
c) –CH2NHCH3,-CH2NH2,-NH2,-CN
d) –Br,-CH2Br,-Cl,-CH2Cl
e) –OH, –CH2CH3,–CH=CH2,–OCH2CH3
f) –NH2 , –NO2 , –NHCH3 ,
g) –CH2CH3 , –CH2SH , –CH(CH3)2 ,
h)–CH(CH3)2,–C(CH3)3,–CH2CH(CH3)2, –CH2C(CH3)3
i) –OCl , –NHCl , –OBr , –NHBr
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