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Magazine Chapter 23: Problem 47
Write the formula, and draw the structure, for each of the following amines: (a) ethylamine (b) dipropylamine (c) butyldimethylamine (d) triethylamine
Short Answer
Expert verified
(a) Ethylamine: C鈧侶鈧匩H鈧�; (b) Dipropylamine: C鈧咹鈧佲倕N; (c) Butyldimethylamine: C鈧咹鈧佲倕N; (d) Triethylamine: C鈧咹鈧佲倕N.
Step by step solution
01
Understanding Amines and Structures
Amines are organic compounds derived from ammonia by replacement of one or more hydrogen atoms by organic groups. The primary amine has the general formula RNH鈧�, secondary amine R鈧侼H, and tertiary amine R鈧僋. Before determining the formulas, it is important to recognize the substituents present in the amines: ethyl (C鈧侶鈧�), propyl (C鈧僅鈧�), butyl (C鈧凥鈧�), methyl (CH鈧�).
02
Ethylamine (Primary Amine)
Ethylamine is a primary amine with one ethyl group attached to a nitrogen atom. The structure can be written as C鈧侶鈧匩H鈧�. The nitrogen is single-bonded to the ethyl group and has two hydrogen atoms.
03
Dipropylamine (Secondary Amine)
Dipropylamine is a secondary amine with two propyl groups attached to a nitrogen atom. The structure is (C鈧僅鈧�)鈧侼H or C鈧咹鈧佲倕N. The nitrogen is bonded to two propyl groups and one hydrogen atom.
04
Butyldimethylamine (Tertiary Amine)
Butyldimethylamine is a tertiary amine with one butyl group and two methyl groups attached to a nitrogen atom. The structure is C鈧凥鈧塏(CH鈧�)鈧� or C鈧咹鈧佲倕N. The nitrogen is bonded to the butyl group and two methyl groups.
05
Triethylamine (Tertiary Amine)
Triethylamine is a tertiary amine with three ethyl groups attached to a nitrogen atom. The structure is (C鈧侶鈧�)鈧僋 or C鈧咹鈧佲倕N. The nitrogen is bonded to three ethyl groups.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Organic Compounds
Organic compounds are a large class of chemical compounds in which carbon is a principal element. These compounds are the basis of life, playing a crucial role in biology and chemistry. Carbon atoms can form stable covalent bonds with many elements, such as hydrogen, oxygen, nitrogen, and more, leading to a vast diversity of compounds.
Here are some characteristics:
Here are some characteristics:
- High variety due to the ability of carbon atoms to form strong covalent bonds with other carbon atoms and different elements.
- Typically have covalent bonding and can exist as gases, liquids, or solids.
- Include groups like alcohols, aldehydes, ketones, and amines, among others.
Amines Structure
Amines are a specific type of organic compound that include a nitrogen atom bonded to hydrogen atoms and/or carbon-containing groups known as alkyl or aryl groups. The general formula for an amine is NH鈧�, where one or more of the hydrogen atoms is replaced by an alkyl or aryl group.
Key points about amines include:
Key points about amines include:
- The nitrogen atom in amines typically exhibits a lone pair of electrons, which affects the chemical reactivity and physical properties.
- Amines are categorized based on how many carbon-containing groups are attached to the nitrogen.
- Amines can be primary (1掳), secondary (2掳), or tertiary (3掳), depending on the number of organic substituents on the nitrogen.
Primary Amines
Primary amines are characterized by having one alkyl or aryl group attached to the nitrogen atom, with the general formula RNH鈧�, where "R" stands for an organic substituent. They are the simplest type of amines and serve as building blocks for more complex amine structures.
Attributes of primary amines:
Attributes of primary amines:
- They have two hydrogen atoms bonded to the nitrogen atom.
- Primary amines can form stronger hydrogen bonds due to the availability of two hydrogen atoms.
- Examples include ethylamine (C鈧侶鈧匩H鈧�) where the nitrogen atom bonds with one ethyl group and two hydrogens.
Secondary Amines
Secondary amines feature two alkyl or aryl groups substituted on the nitrogen atom, denoted as R鈧侼H. These have intermediate properties between primary and tertiary amines.
Notable aspects of secondary amines:
Notable aspects of secondary amines:
- The nitrogen atom in secondary amines is connected to two carbon groups and one hydrogen atom.
- They tend to have a higher boiling point compared to primary amines due to greater molecular weight.
- An example is dipropylamine ((C鈧僅鈧�)鈧侼H) where the nitrogen is bonded with two propyl groups and one hydrogen.
Tertiary Amines
Tertiary amines have all three hydrogen atoms in ammonia replaced by organic groups, with the formula R鈧僋. They have distinct chemical and physical properties compared to primary and secondary amines.
Features of tertiary amines:
Features of tertiary amines:
- The nitrogen atom binds with three organic substituents and no hydrogen atoms.
- Lack the ability to form hydrogen bonds among themselves, resulting in lower boiling points.
- Examples include triethylamine ((C鈧侶鈧�)鈧僋) with three ethyl groups attached to nitrogen.
- Butyldimethylamine C鈧凥鈧塏(CH鈧�)鈧� is another tertiary amine example with wide use in chemical synthesis.
