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Chapter 22: Problem 9

Give an example reaction that would yield the following products as major organic products. See Exercises 22.68 and 22.71 for some hints. For oxidation reactions, just write oxidation over the arrow and don鈥檛 worry about the actual reagent. a. primary alcohol b. secondary alcohol c. tertiary alcohol d. aldehyde e. ketone f. carboxylic acid g. ester

Short Answer

Expert verified
a. Primary alcohol: \( HCHO + [ LiAlH_4 ] \rightarrow CH_3OH \) b. Secondary alcohol: \( CH_3COCH_3 + [ LiAlH_4 ] \rightarrow CH_3CH(OH)CH_3 \) c. Tertiary alcohol: \( CH_3C(CH_3)=CH_2 + H_2O \xrightarrow{ H_2SO_4 } CH_3C(CH_3)(CH_2)(OH) \) d. Aldehyde: \( CH_3CH_2OH \xrightarrow{ oxidation } CH_3CHO \) e. Ketone: \( CH_3CH(OH)CH_3 \xrightarrow{ oxidation } CH_3COCH_3 \) f. Carboxylic acid: \( CH_3CH_2OH \xrightarrow{ oxidation } CH_3COOH \) g. Ester: \( CH_3COOH + CH_3OH \xrightarrow{ H_2SO_4 } CH_3COOCH_3 + H_2O \)

Step by step solution

01

Primary alcohol

Reduction of an aldehyde is a common method to prepare primary alcohols. We can use a simple aldehyde such as formaldehyde (\( HCHO\) ) with a reducing agent like lithium aluminium hydride (\( LiAlH_4 \)). \[ HCHO + [ LiAlH_4 ] \rightarrow CH_3OH \]
02

Secondary alcohol

Reduction of a ketone is a common method to prepare secondary alcohols. We can use a simple ketone such as acetone (\( CH_3-CO-CH_3 \)) and a reducing agent like lithium aluminium hydride (\( LiAlH_4 \)). \[ CH_3COCH_3 + [ LiAlH_4 ] \rightarrow CH_3CH(OH)CH_3 \]
03

Tertiary alcohol

The reaction of an alkene with water in the presence of an acid catalyst (hydration reaction) can produce tertiary alcohols. We can use a simple alkene such as 2-methylpropene (\( CH_3C(CH_3)=CH_2\)) and a dilute sulfuric acid solution (\( H_2SO_4 \)). \[ CH_3C(CH_3)=CH_2 + H_2O \xrightarrow{ H_2SO_4 } CH_3C(CH_3)(CH_2)(OH) \]
04

Aldehyde

A common method to produce an aldehyde is by the partial oxidation of a primary alcohol. We can use a simple primary alcohol like ethanol (\( CH_3CH_2OH \)) and an oxidation reagent. \[ CH_3CH_2OH \xrightarrow{ oxidation } CH_3CHO \]
05

Ketone

The oxidation of a secondary alcohol results in a ketone. We can use a simple secondary alcohol like isopropanol (\( CH_3CH(OH)CH_3 \)) and an oxidation reagent. \[ CH_3CH(OH)CH_3 \xrightarrow{ oxidation } CH_3COCH_3 \]
06

Carboxylic acid

Complete oxidation of a primary alcohol can generate a carboxylic acid. We can use a simple primary alcohol like ethanol (\( CH_3CH_2OH \)) and an oxidation reagent. \[ CH_3CH_2OH \xrightarrow{ oxidation } CH_3COOH \]
07

Ester

The reaction of a carboxylic acid with an alcohol in the presence of an acid catalyst (esterification reaction) produces esters. We can use a simple carboxylic acid like acetic acid (\( CH_3COOH \)) and a simple alcohol like methanol (\( CH_3OH \)) with a sulfuric acid catalyst. \[ CH_3COOH + CH_3OH \xrightarrow{ H_2SO_4 } CH_3COOCH_3 + H_2O \]

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Oxidation Reactions
Oxidation reactions are essential in organic chemistry, often converting alcohols to more oxidized forms such as aldehydes, ketones, or carboxylic acids. When a primary alcohol is oxidized, it first forms an aldehyde and can further oxidize to a carboxylic acid. For example, ethanol (\( CH_3CH_2OH \)) can be oxidized to acetaldehyde (\( CH_3CHO \)) and then to acetic acid (\( CH_3COOH \)).
  • Primary Alcohol to Aldehyde: Partial oxidation
  • Primary Alcohol to Carboxylic Acid: Complete oxidation
  • Secondary Alcohol to Ketone: Simple oxidation
This process involves the loss of hydrogen or the gain of oxygen, increasing the oxidation state of the molecule.
Understanding oxidation helps predict product outcomes and is crucial for synthesizing various organic compounds.
Reduction Reactions
Reduction reactions involve the gain of electrons or hydrogen, often reversing oxidation processes. In organic chemistry, reduction usually means converting carbonyl groups into alcohols using reducing agents.
  • Aldehyde to Primary Alcohol: \( HCHO \) to methanol (\( CH_3OH \))
  • Ketone to Secondary Alcohol: Acetone (\( CH_3COCH_3 \)) to isopropanol (\( CH_3CH(OH)CH_3 \))
Common reducing agents include lithium aluminium hydride (\( LiAlH_4 \)) and sodium borohydride (\( NaBH_4 \)).
Reduction reactions are pivotal in transforming functional groups and are widely used in industry and research for obtaining specific alcohols.
Hydration Reaction
Hydration reactions occur when water is added to a molecule, often with the assistance of a catalyst, leading to alcohol formation. This reaction is common in converting alkenes to alcohols.
  • Hydration of 2-Methylpropene: Forms tertiary alcohol
Using an acid catalyst like dilute sulfuric acid (\( H_2SO_4 \)), water (\( H_2O \)) adds across the double bond of alkenes, such as in 2-methylpropene, to produce tertiary butyl alcohol.
This ability to add hydroxyl groups makes hydration a key reaction for synthesizing various alcohols.
Esterification
Esterification is the process of forming an ester from a carboxylic acid and an alcohol, typically in the presence of an acid catalyst like sulfuric acid (\( H_2SO_4 \)).
  • Acetic Acid and Methanol: \( CH_3COOH + CH_3OH \rightarrow CH_3COOCH_3 + H_2O \)
This reaction results in the formation of an ester and water. The process involves the acid catalyst inducing the nucleophilic attack of the alcohol's hydroxyl group on the carbonyl carbon of the acid.
Esterification is fundamental in creating flavors, fragrances, and polymers, making it a versatile reaction in both nature and industry.

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Most popular questions from this chapter

Structural, geometrical, and optical isomers can be drawn having the formula \(\mathrm{C}_{6} \mathrm{H}_{12}\) . Give examples to illustrate these types of isomerism for \(\mathrm{C}_{6} \mathrm{H}_{12}\)

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How many different pentapeptides can be formed using five different amino acids?

For each of the following, fill in the blank with the correct response(s). All of the following pertain to nucleic acids. a. The substance in the nucleus of the cell that stores and transmits genetic information is DNA, which stands for. b. The basic repeating monomer units of DNA and RNA are called . c. The pentose deoxyribose is found in DNA, whereas is found in RNA. d. The basic linkage in DNA or RNA between the sugar molecule and phosphoric acid is a phosphate linkage. e. The bases on opposite strands of DNA are said to be to each other, which means the bases fit together specifically by hydrogen bonding to one another. f. In a strand of normal DNA, the base is always found paired with the base adenine, whereas is always found paired with cytosine. g. A given segment of the DNA molecule, which contains the molecular coding for a specific protein to be synthesized, is referred to as a . h. During protein synthesis, RNA molecules attach to and transport specific amino acids to the appropriate position on the pattern provided by RNA molecules. i. The codes specified by are responsible for assembling the correct primary structure of proteins.
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