Predict the major product of acid catalysed dehydration:
(i) 1-methyl cyclohexanol
(ii) Butan-1-ol

Question

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Answer 1

Due to Saytzeff rule, in $(i)$ the product where double bond is formed at the more substituted carbon is the major product. But as Saytzeff rule is only valid for 2° and 3° alcohols, a primary alcohol like $(i i)$ will form a terminal alkene as the major product.

Answer 2

Due to Saytzeff rule, in

(i)

the product where double bond is formed at the more substituted carbon is the major product. But as Saytzeff rule is only valid for 2° and 3° alcohols, a primary alcohol like

(i i)

will form a terminal alkene as the major product.

Predict the major product of acid catalysed dehydration:
(i) 1-methyl cyclohexanol
(ii) Butan-1-ol

Due to Saytzeff rule, in $(i)$ the product where double bond is formed at the more substituted carbon is the major product. But as Saytzeff rule is only valid for 2° and 3° alcohols, a primary alcohol like $(i i)$ will form a terminal alkene as the major product.

What is the major product A?

The major product is:

Dehydration of methyl alcohol gives:

The major product in the acid catalysed dehydration of 2-pentanol is

Acid catalysed dehydration of t-butanol is slower than n-butanol.

Dehydration involves formation of the protonated alcohol, $$ ROH^+_2 $$

Acid catalysed dehydration of t-butanol is slower than n-butanol.

Revise with Concepts

Chemical Properties of Alcohols and Phenols - Reactions involving cleavage of O-H bond

Chemical Properties of Alcohols - Reactions Involving Cleavage of C - O Bond

Electrophilic Aromatic Substitution Reactions in Phenols

Other reactions of Phenols

Predict the major product of acid catalysed dehydration: (i) 1-methyl cyclohexanol (ii) Butan-1-ol

Due to Saytzeff rule, in (i) the product where double bond is formed at the more substituted carbon is the major product. But as Saytzeff rule is only valid for 2° and 3° alcohols, a primary alcohol like (ii) will form a terminal alkene as the major product.

What is the major product A?

The major product is:

Dehydration of methyl alcohol gives:

The major product in the acid catalysed dehydration of 2-pentanol is

Acid catalysed dehydration of t-butanol is slower than n-butanol.

Dehydration involves formation of the protonated alcohol, $$ ROH^+_2 $$

Acid catalysed dehydration of t-butanol is slower than n-butanol.

Revise with Concepts

Chemical Properties of Alcohols and Phenols - Reactions involving cleavage of O-H bond

Chemical Properties of Alcohols - Reactions Involving Cleavage of C - O Bond

Electrophilic Aromatic Substitution Reactions in Phenols

Other reactions of Phenols

Predict the major product of acid catalysed dehydration:
(i) 1-methyl cyclohexanol
(ii) Butan-1-ol

Due to Saytzeff rule, in $(i)$ the product where double bond is formed at the more substituted carbon is the major product. But as Saytzeff rule is only valid for 2° and 3° alcohols, a primary alcohol like $(i i)$ will form a terminal alkene as the major product.