Which of the following methods would be successful in producing the product starting from the given reactant in good yield ? Note: The steps in a method are written in the order carried out. OH EtO OEt Method I: (a)2 eq. CH3MgBr,(b)H3O*,(c)BrCH2Ph/Mg,(d)H30*. Method II:(a)NaOEt, (b)BrCH2Ph, (c)H3O*/heat, (d)LIAIIH4, (e)H3O*,(f)2 eq. CH3MgBr, (g)H3O*. Method III:(a)NaOEt, (b)BrCH2Ph, (c)H30*/heat, (d) SOCI2,(e)2 eq. CH3MgBr, (f)H3O*. Method IV:(a)NaOEt, (b)CH31, (c)NaOEt, (d)CH3I,(e)H3O*/heat, (f)BrCH2Ph/Mg, (g)H3O*. O Method IV O Method II O Method III O Method I
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.
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