cycloaddition of 2 cyclopentadienyl compounds.

cycloaddition of 2 cyclopentadienyl compounds.

Hello!
I have synthesized a Cp compound with one ester group (which then I hydrolyzed it to carboxylic acid). This Cp has also 2 methyl group on it. a similar compound is thiele's acid, however it doesn't have any methyl. It's literally dimer of Cp-COOH. in ambient temperature, a Cp-COOH dimerizes to thiele's acid. but the compounds I made do not. I want to think that it's strictly hindered, but we see bunch of cycloaddition reactions with much bigger group on the diene or dienophile. I found a similar thing in a paper saying: the ester group pulls electron density out of the ring, making the double bonds electron-poor — and electron-poor dienes don't react well in this kind of cycloaddition. the Paper
I believe both dienophile and diene's reactivity matters. So, that still doesn't make sense to me. yes! the diene is electron-poor and bad and lower HOMO. But at the same time it's dienophile, too, its LUMO is lower too. Can someone explain this to me please?
p.n. the picture turned black. Please see the figures here for better understandding: https://www.image2url.com/r2/default/images/1784232563182-7bd49500-559a-4a8c-b11d-dcb9ff4623bb.png

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