Difference between revisions of "Organic chemistry" - New World Encyclopedia
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| − | '''Organic chemistry''' is the [[science|scientific]] study of the | + | {{Copyedited}}{{Paid}}{{Approved}}{{Images OK}}{{Submitted}} {{Status}} |
| + | [[Category:Public]] | ||
| + | '''Organic chemistry''' is the [[science|scientific]] study of the structures, properties, and methods of [[organic synthesis|syntheses]] of [[chemical compound]]s that are based on [[carbon]]. This field stands in a complementary relationship to [[inorganic chemistry]], which covers the study of the [[compound]]s of all other [[element]]s, as well as the elements themselves.<ref>The study of some compounds of carbon—such as carbon dioxide, carbonates, and cyanides—is considered part of inorganic chemistry.</ref> These two disciplines are generally considered separately, but there is much overlap, such as in the sub-discipline of [[organometallic chemistry]]. | ||
| + | |||
| + | Organic compounds are primarily composed of [[carbon]] and [[hydrogen]], and may contain any number of other elements, the most common of which are [[nitrogen]] and [[oxygen]]. Each carbon atom, with its pattern of forming four covalent bonds, can connect with other carbon atoms in a variety of ways to give the enormous diversity of organic compounds found. Each molecule is often described as having a "skeleton" of carbon atoms. The essential indication for existence and relationship inherent in four-based structures is appropriate for carbon, as it is one of the bases of life itself. | ||
| + | {{toc}} | ||
| + | Important classes of organic compounds include the [[alkane]]s, [[alkene]]s, [[alkyne]]s, [[aromatic compound]]s, [[alcohol]]s, [[aldehyde]]s, [[ketone]]s, [[carboxylic acid]]s, [[ester]]s, [[ether]]s, [[amine]]s, and [[amide]]s. Many organic compounds—such as [[carbohydrate]]s, [[amino acid]]s, [[protein]]s, [[lipid]]s, [[nucleotide]]s, and [[nucleic acid]]s—are found in living systems. The study of organic chemistry has led to enormous benefits in practical terms, such as in the production of [[textile]]s, [[paint]]s, [[plastic]]s, [[fuel]]s, and [[pharmaceutical]]s. | ||
==History== | ==History== | ||
| − | + | ||
| + | It was once thought that certain compounds, called "organic compounds," were produced only by living organisms. The study of such compounds was therefore called ''organic chemistry''. However, the defining notion of organic compounds was proven false in 1828, when [[Friedrich Woehler]] accidentally synthesized the biologically significant compound [[urea]] by evaporating an aqueous solution of [[cyanates|ammonium cyanate]] (NH<sub>4</sub>OCN). Later, the term "organic chemistry" was redefined to mean the chemistry of the compounds of carbon. | ||
==Characteristics of organic substances== | ==Characteristics of organic substances== | ||
| − | Organic compounds are [[covalent bond| covalently bonded]] and thus, its bonds are directional. | + | Organic compounds are [[covalent bond|covalently bonded]] and thus, its bonds are directional. This allows for unique structures such as long carbon chains and rings. The reason carbon is excellent at forming unique structures and that there are so many carbon compounds is that carbon atoms form very stable covalent bonds with one another ([[catenation]]). In contrast to inorganic materials, organic compounds typically melt, sublime, or decompose below 300°C. Neutral organic compounds tend to be less [[soluble]] in [[water]] compared to many inorganic [[salt]]s, with the exception of certain compounds such as ionic organic compounds and low [[molecular weight]] [[alcohols]] and [[carboxylic acids]] where there is [[hydrogen bonding]] present. Organic compounds tend to be much more soluble in organic [[solvent]]s such as [[ether]] or [[alcohol]], but the solubility in each solute is dependent on the [[functional group]]s present and of the general structure. |
==Organic nomenclature== | ==Organic nomenclature== | ||
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===Aliphatic compounds=== | ===Aliphatic compounds=== | ||
| − | [[Aliphatic]] | + | [[Aliphatic compound]]s are organic molecules that do not contain aromatic systems. Typically, they contain hydrocarbon chains. |
[[Hydrocarbon]]s - [[Alkane]]s - [[Alkene]]s - [[diene|Dienes or Alkadienes]] - [[Alkyne]]s - [[Haloalkane]]s | [[Hydrocarbon]]s - [[Alkane]]s - [[Alkene]]s - [[diene|Dienes or Alkadienes]] - [[Alkyne]]s - [[Haloalkane]]s | ||
===Aromatic compounds=== | ===Aromatic compounds=== | ||
| − | [[Aromatic]] | + | [[Aromatic compounds]] are organic molecules that contain one or more aromatic ring system. This usually means, but is not limited to, those compounds that contain a benzene ring. |
[[Benzene]] - [[Toluene]] - [[Styrene]] - [[Xylene]] - [[Aniline]] - [[Phenol]] - [[Acetophenone]] - [[Benzonitrile]] - [[Haloarene|Haloarenes]] - [[Naphthalene]] - [[Anthracene]] - [[Phenanthrene]] - [[Benzopyrene]] - [[Coronene]] - [[Azulene]] - [[Biphenyl]] | [[Benzene]] - [[Toluene]] - [[Styrene]] - [[Xylene]] - [[Aniline]] - [[Phenol]] - [[Acetophenone]] - [[Benzonitrile]] - [[Haloarene|Haloarenes]] - [[Naphthalene]] - [[Anthracene]] - [[Phenanthrene]] - [[Benzopyrene]] - [[Coronene]] - [[Azulene]] - [[Biphenyl]] | ||
===Heterocyclic compounds=== | ===Heterocyclic compounds=== | ||
| − | Heterocyclic compounds are cyclic organic molecules whose ring(s) contain at least one [[heteroatom]]. | + | [[Heterocyclic compounds]] are cyclic organic molecules whose ring(s) contain at least one [[heteroatom]]. These heteroatoms can include oxygen, nitrogen, phosphorus, and sulfur. |
[[Imidazole]] - [[Indole]] - [[Pyridine]] - [[Pyrrole]] - [[Thiophene]] - [[Furan]] - [[Purine]]s | [[Imidazole]] - [[Indole]] - [[Pyridine]] - [[Pyrrole]] - [[Thiophene]] - [[Furan]] - [[Purine]]s | ||
| − | ===[[Functional | + | ===[[Functional group]]s=== |
| − | [[Alcohol]]s | + | |
| + | These are parts of an organic molecule characterized by a specific composition and connected structure of the constituent atoms. Each functional group has a specific pattern of properties and reactions that characterize the compound. Some common functional groups are: [[Alcohol]]s, [[Aldehyde]]s, [[Amide]]s, [[Amine]]s, [[Carboxylic acid]]s, [[Ester]]s, [[Ether]]s, [[Ketone]]s, [[Nitrile]]s. | ||
===Polymers=== | ===Polymers=== | ||
| − | [[ | + | [[Polymer]]s form a special group of molecule. Generally considered "large" molecules, polymers get their reputation regarding size because they are molecules that consist of multiple smaller segments. The segments could be chemically identical, which would make such a molecule a homopolymer. Or the segments could vary in chemical structure, which would make that molecule a heteropolymer. Polymers are a subset of "[[macromolecule]]s" which is just a classification for all molecules that are considered large. |
| − | Polymers can be organic or inorganic. | + | Polymers can be organic or inorganic. Commonly encountered polymers are usually organic (such as [[polyethylene]], [[polypropylene]], or [[Plexiglass]]). But inorganic polymers (such as [[silicone]]) are also part of familiar items. |
| − | Important biological molecules such as [[ | + | Important biological molecules, such as [[protein]]s, [[nucleic acid]]s, and [[polysaccharide]]s, are also polymers ([[biopolymer]]s). |
==Determining the molecular structure of an organic compound== | ==Determining the molecular structure of an organic compound== | ||
| − | Currently, there exist several methods for characterizing an organic compound. | + | Currently, there exist several methods for characterizing an organic compound. In general usage is (in alphabetical order): |
* [[Crystallography]]: This is the most precise method; however, it is very difficult to grow crystals of sufficient size and high quality to get a clear picture, so it remains a secondary form of analysis. | * [[Crystallography]]: This is the most precise method; however, it is very difficult to grow crystals of sufficient size and high quality to get a clear picture, so it remains a secondary form of analysis. | ||
* [[Elemental Analysis]]: A destructive method used to determine the elemental composition of a molecule. | * [[Elemental Analysis]]: A destructive method used to determine the elemental composition of a molecule. | ||
| − | * [[Infrared spectroscopy]]: Chiefly used to determine the presence (or absence) of certain [[functional | + | * [[Infrared spectroscopy]]: Chiefly used to determine the presence (or absence) of certain [[functional group]]s. |
* [[Mass spectrometry]]: Used to determine the [[molecular weight]] of a compound and the fragmentation pattern. | * [[Mass spectrometry]]: Used to determine the [[molecular weight]] of a compound and the fragmentation pattern. | ||
* [[Nuclear magnetic resonance|Nuclear magnetic resonance (NMR) spectrometry]] | * [[Nuclear magnetic resonance|Nuclear magnetic resonance (NMR) spectrometry]] | ||
* [[UV/VIS spectroscopy]]: Used to determine degree of conjugation in the system | * [[UV/VIS spectroscopy]]: Used to determine degree of conjugation in the system | ||
| − | + | ==Organic reactions== | |
| − | + | Due to the huge number of possible organic compounds, an important part of organic chemistry is understanding the synthesis and reactions of organic compounds. There are distinct patterns based on functional group and carbon structure that can be applied to classes of compounds, see [[organic reaction]]. Many types of reaction bear the name of the person who discovered it, such as Grignard reactions, or the Williamson synthesis of ethers. Modern organic chemistry also tries to understand the [[Reaction mechanism|mechanism]], or process at the molecular level, for each type of reaction. | |
| − | |||
| − | ==See also== | + | == See also == |
| − | |||
| − | |||
| − | |||
| − | |||
| − | + | * [[Biochemistry]] | |
| − | *[ | + | * [[Carbon]] |
| − | *[ | + | * [[Chemistry]] |
| − | + | * [[Inorganic chemistry]] | |
| − | |||
| − | *[ | ||
| − | |||
| − | |||
| − | * | ||
| + | ==Notes== | ||
| + | <references/> | ||
| − | + | == References == | |
| + | * McMurry, John. 2004. ''Organic Chemistry,'' 6th ed. Belmont, CA: Brooks/Cole. ISBN 0534420052. | ||
| + | * Morrison, Robert T., and Robert N. Boyd. 1992. ''Organic Chemistry,'' 6th ed. Englewood Cliffs, NJ: Prentice Hall. ISBN 0136436692. | ||
| + | * Solomons, T.W. Graham, and Craig B. Fryhle 2004. ''Organic Chemistry,'' 8th ed. Hoboken, NJ: John Wiley. ISBN 0471417998. | ||
| + | ==External links== | ||
| + | All links retrieved November 17, 2022. | ||
| − | + | *[https://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/intro1.htm Virtual Textbook of Organic Chemistry] | |
| + | ---- | ||
| + | {{BranchesofChemistry}} | ||
{{Natural sciences-footer}} | {{Natural sciences-footer}} | ||
| − | + | [[Category:Physical sciences]] | |
| − | + | [[Category:Chemistry]] | |
| + | [[Category:Organic chemistry|*]] | ||
{{credit|23321426}} | {{credit|23321426}} | ||
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Latest revision as of 01:13, 18 November 2022
Organic chemistry is the scientific study of the structures, properties, and methods of syntheses of chemical compounds that are based on carbon. This field stands in a complementary relationship to inorganic chemistry, which covers the study of the compounds of all other elements, as well as the elements themselves.[1] These two disciplines are generally considered separately, but there is much overlap, such as in the sub-discipline of organometallic chemistry.
Organic compounds are primarily composed of carbon and hydrogen, and may contain any number of other elements, the most common of which are nitrogen and oxygen. Each carbon atom, with its pattern of forming four covalent bonds, can connect with other carbon atoms in a variety of ways to give the enormous diversity of organic compounds found. Each molecule is often described as having a "skeleton" of carbon atoms. The essential indication for existence and relationship inherent in four-based structures is appropriate for carbon, as it is one of the bases of life itself.
Important classes of organic compounds include the alkanes, alkenes, alkynes, aromatic compounds, alcohols, aldehydes, ketones, carboxylic acids, esters, ethers, amines, and amides. Many organic compounds—such as carbohydrates, amino acids, proteins, lipids, nucleotides, and nucleic acids—are found in living systems. The study of organic chemistry has led to enormous benefits in practical terms, such as in the production of textiles, paints, plastics, fuels, and pharmaceuticals.
History
It was once thought that certain compounds, called "organic compounds," were produced only by living organisms. The study of such compounds was therefore called organic chemistry. However, the defining notion of organic compounds was proven false in 1828, when Friedrich Woehler accidentally synthesized the biologically significant compound urea by evaporating an aqueous solution of ammonium cyanate (NH4OCN). Later, the term "organic chemistry" was redefined to mean the chemistry of the compounds of carbon.
Characteristics of organic substances
Organic compounds are covalently bonded and thus, its bonds are directional. This allows for unique structures such as long carbon chains and rings. The reason carbon is excellent at forming unique structures and that there are so many carbon compounds is that carbon atoms form very stable covalent bonds with one another (catenation). In contrast to inorganic materials, organic compounds typically melt, sublime, or decompose below 300°C. Neutral organic compounds tend to be less soluble in water compared to many inorganic salts, with the exception of certain compounds such as ionic organic compounds and low molecular weight alcohols and carboxylic acids where there is hydrogen bonding present. Organic compounds tend to be much more soluble in organic solvents such as ether or alcohol, but the solubility in each solute is dependent on the functional groups present and of the general structure.
Organic nomenclature
Organic nomenclature is the system established for naming and grouping organic compounds.
Aliphatic compounds
Aliphatic compounds are organic molecules that do not contain aromatic systems. Typically, they contain hydrocarbon chains.
Hydrocarbons - Alkanes - Alkenes - Dienes or Alkadienes - Alkynes - Haloalkanes
Aromatic compounds
Aromatic compounds are organic molecules that contain one or more aromatic ring system. This usually means, but is not limited to, those compounds that contain a benzene ring.
Benzene - Toluene - Styrene - Xylene - Aniline - Phenol - Acetophenone - Benzonitrile - Haloarenes - Naphthalene - Anthracene - Phenanthrene - Benzopyrene - Coronene - Azulene - Biphenyl
Heterocyclic compounds
Heterocyclic compounds are cyclic organic molecules whose ring(s) contain at least one heteroatom. These heteroatoms can include oxygen, nitrogen, phosphorus, and sulfur.
Imidazole - Indole - Pyridine - Pyrrole - Thiophene - Furan - Purines
Functional groups
These are parts of an organic molecule characterized by a specific composition and connected structure of the constituent atoms. Each functional group has a specific pattern of properties and reactions that characterize the compound. Some common functional groups are: Alcohols, Aldehydes, Amides, Amines, Carboxylic acids, Esters, Ethers, Ketones, Nitriles.
Polymers
Polymers form a special group of molecule. Generally considered "large" molecules, polymers get their reputation regarding size because they are molecules that consist of multiple smaller segments. The segments could be chemically identical, which would make such a molecule a homopolymer. Or the segments could vary in chemical structure, which would make that molecule a heteropolymer. Polymers are a subset of "macromolecules" which is just a classification for all molecules that are considered large.
Polymers can be organic or inorganic. Commonly encountered polymers are usually organic (such as polyethylene, polypropylene, or Plexiglass). But inorganic polymers (such as silicone) are also part of familiar items.
Important biological molecules, such as proteins, nucleic acids, and polysaccharides, are also polymers (biopolymers).
Determining the molecular structure of an organic compound
Currently, there exist several methods for characterizing an organic compound. In general usage is (in alphabetical order):
- Crystallography: This is the most precise method; however, it is very difficult to grow crystals of sufficient size and high quality to get a clear picture, so it remains a secondary form of analysis.
- Elemental Analysis: A destructive method used to determine the elemental composition of a molecule.
- Infrared spectroscopy: Chiefly used to determine the presence (or absence) of certain functional groups.
- Mass spectrometry: Used to determine the molecular weight of a compound and the fragmentation pattern.
- Nuclear magnetic resonance (NMR) spectrometry
- UV/VIS spectroscopy: Used to determine degree of conjugation in the system
Organic reactions
Due to the huge number of possible organic compounds, an important part of organic chemistry is understanding the synthesis and reactions of organic compounds. There are distinct patterns based on functional group and carbon structure that can be applied to classes of compounds, see organic reaction. Many types of reaction bear the name of the person who discovered it, such as Grignard reactions, or the Williamson synthesis of ethers. Modern organic chemistry also tries to understand the mechanism, or process at the molecular level, for each type of reaction.
See also
Notes
- ↑ The study of some compounds of carbon—such as carbon dioxide, carbonates, and cyanides—is considered part of inorganic chemistry.
ReferencesISBN links support NWE through referral fees
- McMurry, John. 2004. Organic Chemistry, 6th ed. Belmont, CA: Brooks/Cole. ISBN 0534420052.
- Morrison, Robert T., and Robert N. Boyd. 1992. Organic Chemistry, 6th ed. Englewood Cliffs, NJ: Prentice Hall. ISBN 0136436692.
- Solomons, T.W. Graham, and Craig B. Fryhle 2004. Organic Chemistry, 8th ed. Hoboken, NJ: John Wiley. ISBN 0471417998.
External links
All links retrieved November 17, 2022.
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