A double bond in chemistry is a chemical bond between two chemical elements involving four bonding electrons instead of the usual two. The most common double bond, that between two carbon atoms, can be found in alkenes. Many types of double bonds between two different elements exist, for example in a carbonyl group with a carbon atom and an oxygen atom. Other common double bonds are found in azo compounds (N=N), imines (C=N) and sulfoxides (S=O). In skeletal formula the double bond is drawn as two parallel lines (=) between the two connected atoms; typographically, the equals sign is used for this.
Double bonds are stronger than single bonds and double bonds are also shorter. The bond order is two. Double bonds are also electron-rich, which makes them reactive.
|Common chemical compounds with double bonds|
Other articles related to "double bond, double bonds, bonds":
... of steroids, allowing this bacteria to utilize steroids containing a double bond at Δ5, such as testosterone, as its sole source of carbon ... In mammals, transfer of a double bond at Δ5 to Δ4 is catalyzed by 3-β-hydroxy-Δ5-steroid dehydrogenase at the same time as the dehydroxylation of 3-β-hydroxyl group to ketone group, while in C ... putida, Δ5,3-ketosteroid isomerase just transfers a double bond at Δ5 of 3-ketosteroid to Δ4 ...
... ring as opposed to a six-membered ring, which would entail the formation of a double bond in the ring between nitrogen and carbon ... This double bond would result in a rigid ring conformation, thereby destabilizing the molecule ... Thus, the five-membered ring is formed so that the double bond is outside the ring, as shown in the figure ...
... In molecules with alternating double bonds and single bonds, p-orbital overlap can exist over multiple atoms in a chain, giving rise to a conjugated system ... In cumulenes two double bonds are adjacent ... Double bonds are common for period 2 elements carbon, nitrogen, and oxygen, and less common with elements of higher periods ...
... It contains one double bond ... There are two isomers of dihydropyran that differ by the location of the double bond. 3,4-Dihydro-2H-pyran has a double bond at position 5 3,6-dihydro-2H-pyran has the double bond at position 4 ...
... stilbene (Ph-CH=CH-Ph) has a cis- or trans- double bond just by examining at the main peaks in the 1H NMR spectrum ... molecules will have a 13C atom on one of these double bond carbons (i.e ... Thus this additional coupling (additional to the 13C coupling) is diagnostic of the type of double bond, and will allow one to determine if the stilbene molecule has a cis- or trans ...
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