Chapter 20: Problem 45
How could you convert butanenitrile into the following compounds? Write each step showing the reagents needed. (a) 1 -Butanol (b) Butylamine (c) 2 -Methyl-3-hexanone
Short Answer
Expert verified
(a) Hydrolyze to acid, reduce to alcohol. (b) Hydrogenate with H鈧/Raney Ni. (c) Use Grignard reaction with propanal, oxidize to ketone.
Step by step solution
01
Starting Material
Begin with butanenitrile (C鈧凥鈧嘚) as the starting material. It has the structure CH鈧僀H鈧侰H鈧侰鈮.
02
Convert to 1-butanol
React butanenitrile with an aqueous acid, such as H鈧係O鈧, and a strong base, such as NaOH, to hydrolyze it first to a carboxylic acid, and then reduce the acid with LiAlH鈧 to obtain 1-butanol (CH鈧僀H鈧侰H鈧侰H鈧侽H).
03
Convert to butylamine
Hydrogenate butanenitrile using hydrogen gas (H鈧) and a Raney nickel catalyst. This process will reduce the nitrile straight to primary amine, forming butylamine (CH鈧僀H鈧侰H鈧侰H鈧侼H鈧).
04
Prepare for 2-methyl-3-hexanone
To synthesize 2-methyl-3-hexanone, first convert butanenitrile to butyl Grignard reagent: react butanenitrile with alkyl lithium (
-butyllithium,
BuLi) to form BuMgX (where X is a halogen).
05
Form 2-methyl-3-hexanone
React the butyl Grignard reagent with propanal (CH鈧僀H鈧侰HO), followed by oxidation using PCC (pyridinium chlorochromate) to convert any resultant alcohol to a ketone, forming 2-methyl-3-hexanone (C鈧嘓鈧佲倓O).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Butanenitrile
Butanenitrile, with the chemical formula C鈧凥鈧嘚, is an organic compound that belongs to the nitriles family. It features a linear chain of four carbon atoms terminating with a cyano group (-C鈮), distinguishing it within organic chemistry. This compound is a common synthetic target because its cyano group is versatile and can be transformed into various functional groups.
Understanding butanenitrile's structure and reactivity is essential for converting it into other compounds like alcohols and amines. Its cyano group can act as a nucleophile or undergo reduction and hydrolysis in chemical reactions, making it a foundational intermediate in organic synthesis.
Applications of butanenitrile extend to various fields, including pharmaceuticals, where it serves as a precursor for more complex molecules. Its ability to easily transform into different functional groups makes butanenitrile invaluable in synthetic organic chemistry.
Understanding butanenitrile's structure and reactivity is essential for converting it into other compounds like alcohols and amines. Its cyano group can act as a nucleophile or undergo reduction and hydrolysis in chemical reactions, making it a foundational intermediate in organic synthesis.
Applications of butanenitrile extend to various fields, including pharmaceuticals, where it serves as a precursor for more complex molecules. Its ability to easily transform into different functional groups makes butanenitrile invaluable in synthetic organic chemistry.
Chemical Reactions
Chemical reactions are the transformations of reactants into products through breaking and forming chemical bonds. When dealing with organic compounds like butanenitrile, understanding how different chemical reactions can convert it into new compounds is crucial.
Nitriles like butanenitrile undergo hydrolysis to form carboxylic acids in acidic or basic medium. This reaction involves adding water, breaking triple between carbon and nitrogen, and forming a carboxyl group (-COOH).
Nitriles like butanenitrile undergo hydrolysis to form carboxylic acids in acidic or basic medium. This reaction involves adding water, breaking triple between carbon and nitrogen, and forming a carboxyl group (-COOH).
- Hydrolysis: Converts nitriles to carboxylic acids.
- Reduction: Processes like LiAlH鈧 reduction can convert carboxylic acids to alcohols.
- Hydrogenation: Converts nitriles to amines using catalysts like Raney nickel.
Reagents
Reagents are substances or compounds added to a system to cause a chemical reaction or test if a reaction occurs. Selecting the right reagent is vital in organic synthesis, particularly when transforming compounds like butanenitrile.
To convert butanenitrile to 1-butanol, a series of reagents are used. First, an aqueous acid like H鈧係O鈧 is used, followed by a strong base like NaOH to hydrolyze the nitrile to a carboxylic acid. Next, a reducing agent such as lithium aluminium hydride (LiAlH鈧) is employed to reduce the acid to an alcohol.
Another reagent, hydrogen gas (H鈧), coupled with a Raney nickel catalyst, is necessary when butanenitrile is transformed into butylamine. This process, known as hydrogenation, reduces the nitrile group directly to an amine. Each reagent plays a specific role, making understanding their function crucial in executing successful organic transformations.
To convert butanenitrile to 1-butanol, a series of reagents are used. First, an aqueous acid like H鈧係O鈧 is used, followed by a strong base like NaOH to hydrolyze the nitrile to a carboxylic acid. Next, a reducing agent such as lithium aluminium hydride (LiAlH鈧) is employed to reduce the acid to an alcohol.
Another reagent, hydrogen gas (H鈧), coupled with a Raney nickel catalyst, is necessary when butanenitrile is transformed into butylamine. This process, known as hydrogenation, reduces the nitrile group directly to an amine. Each reagent plays a specific role, making understanding their function crucial in executing successful organic transformations.
Nitrile Conversion
Nitrile conversion is a crucial process in organic chemistry, opening avenues for creating various products from nitriles like butanenitrile. The cyano group is a pivotal functional group that can be converted through different pathways, leading to a broad spectrum of compounds.
Through hydrolysis, a nitrile can be converted to a carboxylic acid, which can further be reduced to an alcohol, illustrating one possible conversion pathway. This sequence involves breaking the carbon-nitrogen triple bond, often driven by using acids, bases, and reducing agents.
Another conversion involves hydrogenation, where nitriles are directly transformed into primary amines. This is typically conducted using a catalyst and hydrogen gas, enabling the addition of hydrogen across the carbon-nitrogen multiple bond.
Through hydrolysis, a nitrile can be converted to a carboxylic acid, which can further be reduced to an alcohol, illustrating one possible conversion pathway. This sequence involves breaking the carbon-nitrogen triple bond, often driven by using acids, bases, and reducing agents.
Another conversion involves hydrogenation, where nitriles are directly transformed into primary amines. This is typically conducted using a catalyst and hydrogen gas, enabling the addition of hydrogen across the carbon-nitrogen multiple bond.
- Hydrolysis: Converts nitriles to carboxylic acids and further to alcohols.
- Hydrogenation: Converts nitriles to amines.
- Grignard Reactions: Forms alcohols by adding an alkyl group to the nitrile carbon.