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In chemistry, chemical synthesis is a purposeful execution of chemical reactions to obtain a product, or several products. This happens by physical and chemical manipulations usually involving one or more reactions. In modern laboratory usage, this tends to imply that the process is reproducible, reliable, and established to work in multiple laboratories.

A chemical synthesis begins by selection of compounds that are known as reagents or reactants. Various reaction types can be applied to these to synthesize the product, or an intermediate product. This requires mixing the compounds in a reaction vessel such as a chemical reactor or a simple round-bottom flask. Many reactions require some form of work-up procedure before the final product is isolated.[1] Synthesis can start with very simple compounds (such as various petroleum distillates) and work toward a complex one (total synthesis), or it can start with natural products from plants in which various portions of the desired end-product molecules (such as particular functional groups) are already conveniently assembled (semisynthesis). (Semisynthesis is often more cost-effective than total synthesis for industrial chemical products.)

The amount of product in a chemical synthesis is the reaction yield. Typically, chemical yields are expressed as a weight in grams or as a percentage of the total theoretical quantity of product that could be produced. A side reaction is an unwanted chemical reaction taking place that diminishes the yield of the desired product.

The word synthesis in the present day meaning was first used by the chemist Hermann Kolbe.

Strategies[edit]

Many strategies exist in chemical synthesis that go beyond converting reactant A to reaction product B. In cascade reactions multiple chemical transformations take place within a single reactant, in multi-component reactions up to 11 different reactants form a single reaction product and in a telescopic synthesis one reactant goes through multiple transformations without isolation of intermediates.

Organic synthesis[edit]

Main article: Organic synthesis

Organic synthesis is a special branch of chemical synthesis dealing with the synthesis of organic compounds. In the total synthesis of a complex product it may take multiple steps to synthesize the product of interest, and inordinate amounts of time. Skill in organic synthesis is prized among chemists and the synthesis of exceptionally valuable or difficult compounds has won chemists such as Robert Burns Woodward the Nobel Prize for Chemistry. If a chemical synthesis starts from basic laboratory compounds and yields something new, it is a purely synthetic process. If it starts from a product isolated from plants or animals and then proceeds to new compounds, the synthesis is described as a semisynthetic process.

Other meanings[edit]

The other meaning of chemical synthesis is narrow and restricted to a specific kind of chemical reaction, a direct combination reaction, in which two or more reactants combine to form a single product. The general form of a direct combination reaction is:

A + B → AB

where A and B are elements or compounds, and AB is a compound consisting of A and B. Examples of combination reactions include:

2Na + Cl2 → 2NaCl (formation of table salt)
S + O2SO2 (formation of sulfur dioxide)
4Fe + 3O2 → 2Fe2O3 (iron rusting)
CO2 + H2OH2CO3 (carbon dioxide dissolving and reacting with water to form carbonic acid)

4 special synthesis rules:

metal-oxide + H2O → metal(OH)
non-metal-oxide + H2O → oxi-acid
metal-chloride + O2 → metal-chlorate
metal-oxide + CO2 → metal carbonate (CO3)

See also[edit]

References[edit]

  1. ^ Vogel, A.I., Tatchell, A.R., Furnis, B.S., Hannaford, A.J. and P.W.G. Smith. Vogel's Textbook of Practical Organic Chemistry, 5th Edition. Prentice Hall, 1996. ISBN 0-582-46236-3.

External links[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Chemical_synthesis — Please support Wikipedia.
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Fri, 17 Apr 2015 07:14:55 -0700

The authors thus prepared the L- and D-protein mirror image forms of Rv1738 by total chemical synthesis. The racemic mixture rapidly formed crystals that diffracted to high resolution, and the structure was solved using computational methods that ...

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Mon, 20 Apr 2015 05:36:28 -0700

... and therefore there is no issue with pH stability, nor with electrical resistance, besides the electrolyte conductivity itself,' comments Han Gardeniers whose research at the University of Twente in the Netherlands involves miniaturised chemical ...

Brevard Times

Brevard Times
Mon, 20 Apr 2015 05:45:00 -0700

A dark layer covering most of the water ice deposits supports the theory that organic compounds, as well as water, were delivered from the outer solar system to the inner planets and may have led to prebiotic chemical synthesis and, thusly, life on Earth.

WPRI 12 Eyewitness News

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Thu, 16 Apr 2015 12:41:15 -0700

... researchers argue the presence of organic compounds within Mercury's ice gives credence to the hypothesis that organic compounds “were delivered from the outer solar system to the inner planets and may have led to the prebiotic chemical synthesis ...

Nanowerk

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Wed, 15 Apr 2015 04:37:30 -0700

Because the natural sources cannot meet the demands, the acib method replaces chemical synthesis - an energy-consuming and anything but environmentally friendly process. The common biotech variant via Valencene and a chemical synthesis step is less ...

Harvard Magazine

Harvard Magazine
Wed, 15 Apr 2015 13:03:45 -0700

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Gizmodo

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