Stereoisomers, Enantiomers, Meso Compounds, Diastereomers, Constitutional Isomers, Cis & Trans

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For the last example in the video, the compounds are NOT meso, since they lack chiral centers. A meso compound requires the presence of 2 or more chiral centers in it in addition to the plane of symmetry

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For the last example aren't there no chiral centers because the carbon is connected to the same thing? Therefore it wouldn't be meso? It would just be an identical compound?

[@TheOrganicChemistryTutor]

Yes you're right. Thanks for bringing it to my attention.

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The Organic Chemistry Tutor so its indentical right....for meso it should hve chiral carbon with plane of symmetry .....isnt it???

[@angieangie4419]

Yeah your right :) what makes a meso compound is the fact that it has a chiral carbon with a plane of symmetry, and that all the chiral centers changed, (just like enantiomer, but with symmetry) if you break down the molecule for the last one, you'll see that its the same on both sides. A chiral center needs to have 4 different groups.

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Meso compounds need chiral centers but, have a plane of symmetry.

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Thanks for the explanation in a very simple way with a lot of examples. This video is much helpful for me. By the way in the last example, you said that despite the interchange of chiral centers, due to the presence of a plane of symmetry, they are considered to be achiral. But I think that compounds themselves don't have any chiral centers since those carbons (which have bond with Iodine), have internal symmetrical arrangements (about the vertical axis). Based on what you have taught in this video, this is what makes sense to me. If anyone thinks that my understanding is wrong here, please correct me. Thank you.

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This is true in my opinion also. There are no chiral c atoms, its achiral. so it cannot be meso.

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For the last compound, I thought they were identical molecules because there wasn't a chiral center.

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He said meso but they are identical

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@@mercilezzz They can't be meso compounds because there are no chiral centres.

[@mercilezzz]

Meso compounds have identical stereocenters but opposite R and S configuration, they have an internal plane of symmetry

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@@mercilezzz What's a stereocenter?? Never heard of that, I thought there were only t chiral centres.

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Wait a minute. At 10:04 is cis-1,4-Diiodocyclohexane meso compound? It has two stereocenters but does not have any chiral centers. A meso compound requires at least two chiral centers in a molecule. So, both compounds at 10:10 are not a meso but just an identical to each other.

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