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for my thesis i calculated the ring-strain of a molecule by MP2 on the computer. I was wondering if there is an easy possibility to get the experimental value of the ring strain. I guess I have to combust the compound and somehow calculate it from the combustion-enthalpy. My Problem is, that there is no access to the open form of the molecule to compare it. Is there still a way to calculate it? I thought of the Hess-law maybe there is a way with some standard values? It is an organic molecule only containing C, H and O.

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  • $\begingroup$ I am looking for an experimental setup such as calorimetrie oder TGA ore something to determine the ring strain of my specific molecule. The links are not helping, because my molecule is not a cyclo alkane. You're answer seemes quite rude regarding that it is not helpful or targeting the problem at all. $\endgroup$ – Inselino Dec 13 '18 at 11:29
  • $\begingroup$ You need a measure of ring strain, ie comparison of combusion energy wrt non-strained compound. Wikipedia is helpful: en.wikipedia.org/wiki/Ring_strain $\endgroup$ – Buck Thorn Dec 13 '18 at 12:40
  • $\begingroup$ I edited my question. There is no "open form" of my molecule, well there ist but it is no accesable because I open the ring and polymerize the molecule via ring-opening metathesis polymerization. $\endgroup$ – Inselino Dec 13 '18 at 17:00
  • $\begingroup$ In any case to determine something like ring strain you need an unstrained reference molecule to compare to. Then you can use Hess's law for instance, if data is available. $\endgroup$ – Buck Thorn Dec 13 '18 at 17:06
  • $\begingroup$ There has to be another way. There is a lot of experimental data in publications, but no one is explaining how it is done. There is no open form of the molecule. In Metathesis, you break the doublebond and attach it to another broken doublebond. en.wikipedia.org/wiki/Olefin_metathesis Therefore, the open form with double bonds has at leaast two more methylene groups. $\endgroup$ – Inselino Dec 14 '18 at 12:58

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