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From Mcmurry's organic chemistry 9th edition chapter 18, problem 3p --> (c) why do we use isop...

From Mcmurry's organic chemistry 9th edition chapter 18, problem 3p --> (c) why do we use isopropanol with benzyl bromide instead of isopropyl bromide and benzyl alcohol?

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Answer #1

reaction of benzyl bromide with isopropanol will give benzyl isopropyl ether whereas reaction of isopropyl bromide and benzyl alcohol will not lead to benzyl isopropyl ether

explanation:

reaction of benzyl bromide with isopropanol will undergo by SN1 mechanism

in first step benzyl carbocation is generated, the carbocation is stabilized by resonance

in second step isopropanol attack the benzyl carbocation to form benzyl isopropyl ether as product

step 1 Br CH Ch НС step 2 CH3 CHa CH3 но- CH3 CH CH3

whereas when we treat isopropyl bromide with benzyl alcohol reaction should undergo by SN2 mechanism, for SN2 mechanism we need strong nucleophilie but benzyl alcohol is poor nucleophilie therefore reaction of  isopropyl bromide with benzyl alcohol is not suitable method

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