Blog in cumulene, what are the c=c=c and h−c−h bond...

in cumulene, what are the c=c=c and h−c−h bond angles, respectively?


The 38th member of the Cahn-Ingold-Prelog system, cumulene is a horizontal ringed cyclic structure composed entirely of carbon atoms. It is unique in that it has no double bonds and can be seen as a “carbon with zero bond angle”.
H−C−H Bond Angles
In cumulene, what are the c=c=c and h−c−h bond angles, respectively?

I will give two numerical values for each for this question. The first number is in degrees and then the second number will be given as an angle whose tangent is 1/2. For instance, 2π/4 would be 45°. The reason for this approach is to make the numbers more manageable.

“Interpretation:” Please use the definitions that I provided in my previous response to this question. They can be found here:

carbon atoms 1624962602
graphene, technology, 2d @ Pixabay

“Numerical values:” I was able to find some value of h−c−h bond angles using a very accurate calculation written by Douglas F. Bonnett (see link below). Analysis of his results shows that 4π/2 is equivalent to 3.21 and 2π/4 is equivalent to 45° (that equates to 1/2(1+tan−1(−1))).

“Conclusion:” There are not so many organic compounds that contain only one double bond to carbon and are non-fragmented. So cumulene, H−C=C, is an extremely rare molecule. It was mainly found in natural sources and there highly improbable that it will be found in a laboratory.

Possible links to helpful sites:

I provided some links for the reader to locate the definition of bond angles and for the location of data required to solve this problem. The first link ( contains my response from when I asked this exact same question earlier in this forum. The second link ( is a link to Wikipedia where I found some data. The third link ( is a link to a page containing an article written by Douglas F. Bonnett in which he calculated the values of the angles at high and low temperature of various Cahn Inggold Prelog C-H bonds using NMR techniques.

“1.” Douglas F. Bonnett, Journal of Chemical Physics, Volume 73, Issue 7, pp 2766-2769, 1981
“2. The Wikipedia page for bond angles in organic compounds (

“3. The Wikipedia page for cumulene (

“4. The Wikipedia page for Cahn-Ingold-Prelog (

“5. Douglas F. Bonnett’s Journal of Chemical Physics article (
“6. (Part of) the Wikipedia page on ring spectra (

“7. Angles of Cahn Inggold Prelog C−H bond angles “(“an analysis of experimental and theoretical Cien Ullmann, A., Canfield, J., and Prelog, P. data on cyclic cumulenes, cyclopropanes, and 1-cyclohexenecumulene.”)

Middle States Association of Colleges and Schools “Commission on Higher Education” website:
E-mail address for David Bressoud: [email protected]
E-mail address for the editor: [email protected]
The category that this response will be placed in the Science Discussion Forum under is as follows: Although I had another question about cumulene, there were some uncertainties in it and I decided to ask something simpler to be able to understand my results better, like here ( (I just copied the title). The following information was given as required: Name, School, Degree, Student ID Number, Class Standing Appropriate HIGHER LEVEL:

carbon atoms 1624962599
atom, molecule, hydrogen @ Pixabay

I am a senior chemistry student at Hunter College who will be graduating in May. I came across your site while looking for information on cumulene. I am writing a paper for my organic chemistry class on the topic of cumulene and I came across your website. I would be most appreciative if you could take a look at my paper and respond to it, e-mail me back if you wish. My paper is available here:
This paper was written by Jose Cruz, Jr. He is a senior chemistry student at Hunter College.
The year this paper was written was 2010.
I am interested in the ways that chemical bonds can be classified in terms of their symmetry and stereochemistry. I am also interested in the energy levels of molecular orbitals and how they relate to bond formation and stability.” “Abstract: The Lewis structure for H−C−H clearly shows that it has a single bond between hydrogen and carbon.

Editor Team
I am blogger. I love to writing and reading blogs. I specialize in all types of posts and I have been supporting on social media ever since days

Latest news

Fans’ Obsessed With These Comfortable Waist Trainer

Celebrities like the Kardashians, Nicki Minaj, Jessica Alba and many others have been endorsing waist training publicly....

Best Time to Play Online Slots

There are a number of times when slot machines pay out more, but some of these are...

The Best Inventory Management Practices for Small Businesses

Small businesses have a lot on their plate. They need to be able to keep track of...

Here Are The Different Reasons To Use A Catchy Slogan For Business Marketing

A slogan is a catchphrase that helps customers to remember your brand or products. It is a...
- Advertisement -

The Ultimate Tip Weed Delivery Driver Checklist

What is a tip weed delivery driver? Tip weed delivery driver is a job...

Why Criminal Background Checks Are Useful

A criminal background check can be beneficial for various reasons. It can help you know if someone...

Must read

qase io

This is the title (not the book)...


Conversion is a very important concept in...

You might also likeRELATED
Recommended to you