Select the method(s) that 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 Method I: (a)CrO3/H*, (b)CH3MgBr, (c)H3O+,(d)CrO3/H. Method II: (a)PBr3, (b) Mg, (c)CO2, (d)H3O*, (e)CH3MgBr, (f)H30+. Method III: (a)PBr3, (b)Mg, (c)HCOCH3, (d)H3O*, (e) CrO3/H*. Method IV: (a)Dess-Martin reagent, (b)CH3 CHP*Ph3, (c)03, (d)Zn/H+. O Method IV O Method I and III O Method III and IV O Method III O Method I,III and 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.
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