Misplaced Pages

Dimerization: Difference between revisions

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Browse history interactively← Previous editNext edit →Content deleted Content addedVisualWikitext
Revision as of 00:57, 8 September 2011 editEmausBot (talk | contribs)Bots, Template editors2,856,829 editsm r2.6.4) (robot Modifying: zh:二聚體← Previous edit Revision as of 21:54, 14 December 2011 edit undo129.89.118.171 (talk)No edit summaryNext edit →
Line 2: Line 2:
{{refimprove|date=April 2009}} {{refimprove|date=April 2009}}
]s are often found in vapour phase.]] ]s are often found in vapour phase.]]
A '''dimer''' is a ] entity consisting of two structurally similar subunits called ]s joined by bonds that can be either strong or weak. A '''dimer''' is a ] entity consisting of two structurally similar proteins called ]s joined by bonds that can be either strong or weak.


== Organic chemistry == == Organic chemistry ==

Revision as of 21:54, 14 December 2011

For other uses, see Dimer (disambiguation).
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.
Find sources: "Dimerization" – news · newspapers · books · scholar · JSTOR (April 2009) (Learn how and when to remove this message)
Dimers of carboxylic acids are often found in vapour phase.

A dimer is a chemical entity consisting of two structurally similar proteins called monomers joined by bonds that can be either strong or weak.

Organic chemistry

The dimer of cyclopentadiene although this might not be readily apparent on initial inspection

Molecular dimers are often formed by the reaction of two identical compounds e.g.: 2A → A-A. In this example, monomer "A" is said to dimerise to give the dimer "A-A". An example is Diaminocarbenes, which dimerise to give tetraaminoethylenes:

2 C(NR2)2 → (R2N)2C=C(NR2)2

Acetic acid forms a dimer in the gas phase, the monomer units are held together by hydrogen bonds. Under special conditions, most OH-containing molecules form dimers, e.g. the water dimer.

Dicyclopentadiene is an unsymmetrical dimer of two cyclopentadiene molecules that have reacted in a Diels-Alder reaction to give the product. Upon heating, it "cracks" (undergoes a retro-Diels-Alder reaction) to give identical monomers:

C10H12 → 2 C5H6

The term homodimer is used when the two molecules are identical (e.g. A-A) and heterodimer when they are not (e.g. A-B). The reverse of dimerisation is often called dissociation.

See also

References

Categories: