What are the most number of consecutive double bonds carbon can have

In summary, there are various types of enes such as dienes, trienes, and qua-enes, with allenes being a specific type that has two double bonds in a linear arrangement. This structure can also be found in polymers of acetylene without the cyano caps. There is no limit to the length of enes and conjugated enes are responsible for producing color based on their molecular length. The geometry of an allene is determined by the arrangement of its pi molecular orbitals, with the second pi bond having interactions with both adjacent carbons.
  • #1
bananan
176
0
as there are dienes, trienes, qua-enes, etc. allenes

and what limits it or prevents it from continuing on.

i.e
c=c
c=c=c diene
c=c=c=c triene-enes
(c=c=c=c=c=c=c=c)n

with each end "capped" by a -CN
 
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  • #2
Longer than I think nomenclature could easily describe. Extremely long polymers of acetylene have this structure without the cyano caps of course.

You can read more here,

http://en.wikipedia.org/wiki/Polyacetylene
 
  • #3
There is no limit to 'ene' length. One point of interest is that alternating 'enes' and 'anes' (aka, C=C-C=C-C=C) called conjugated 'enes' are the molecular basis for producing color. The longer the conjugated molecule is, the longer the wavelength of its emitted light. Of course, the doulbe bond doesn't have to be C=C, it could be C=N or C=x, as long as the molecule is conjugated.
 
  • #4
bananan, you may want to understand the actual geometry of an allene.

http://wps.prenhall.com/wps/media/o..._Resources/Chapter_08/Text_Images/FG08_01.JPG

How would the carbon on the right be configured in terms of pi molecular orbitals to arrange for the second bond? Would this second pi molecular be uniquely bonded to the next adjacent carbon on the right, or would it also have some interaction with the carbon on the left?
 

Related to What are the most number of consecutive double bonds carbon can have

What is the maximum number of consecutive double bonds that carbon can have?

The maximum number of consecutive double bonds that carbon can have is three. This is commonly referred to as an allene structure, with the carbon atoms arranged in a linear fashion.

Why can't carbon have more than three consecutive double bonds?

Carbon can only form double bonds with other atoms, not with itself. Therefore, the maximum number of double bonds is limited by the number of atoms that carbon can bond with.

What is the formula for calculating the number of double bonds in a molecule?

The formula for calculating the number of double bonds in a molecule is (2n+2)-x, where n is the number of carbon atoms and x is the number of hydrogen atoms. This is known as the degree of unsaturation.

Can carbon have more than three double bonds in a molecule?

Yes, carbon can have more than three double bonds in a molecule if it forms a ring structure. In this case, the double bonds are not considered consecutive.

What are the physical and chemical properties of molecules with multiple double bonds?

Molecules with multiple double bonds tend to have higher melting and boiling points, as well as increased reactivity. This is due to the increased electron density and delocalization of electrons in the double bonds.

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