1. why is HCl not a good choice as the acid to catalyze a dehydration reaction?
2. Rank the following alcohols in order of ease of dehydration and explain your reason(s) for the ranking: 1-heptanol; 2-heptanol; 2-methyl-2- heptanol.
3. Draw three possible products from the dehydration of 3,3-dimethyl-2-butanol. Realize two of the products will come from a rearrangement.

Question

05-07-2021
Chemistry

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1. why is HCl not a good choice as the acid to catalyze a dehydration reaction?
2. Rank the following alcohols in order of ease of dehydration and explain your reason(s) for the ranking: 1-heptanol; 2-heptanol; 2-methyl-2- heptanol.
3. Draw three possible products from the dehydration of 3,3-dimethyl-2-butanol. Realize two of the products will come from a rearrangement.

Sagot :

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Pstnonsonjokuidn Pstnonsonjokuidn · Answer 1 · 2021-07-05T22:26:26-04:00

Answer:

1) HCl contains the Cl^- which is a good nucleophile

2) 2-methyl-2- heptanol > 2-heptanol > 1-heptanol

3) see image attached

Explanation:

If the dehydration of alcohols is carried out using HCl, the chloride ion which is a good nucleophile will attack the substrate to yield an undesirable product.

The dehydration of alcohols is an E1 reaction. Recall that the ease of E1 reaction increases in the order 3°> 2°> 1°. Hence, 2-methyl-2- heptanol forms a tertiary carbocation intermediate during dehydration and has the greatest ease of dehydration.

The three products formed during the dehydration of 3,3-dimethyl-2-butanol are shown in the image attached. Two out of the three are formed by rearrangement reactions.

Sagot :

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