Comments on: Exo vs Endo Products In The Diels Alder: How To Tell Them Apart https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/ Sun, 19 Apr 2026 09:26:19 +0000 hourly 1 https://wordpress.org/?v=6.9.4 By: Michael Fallentine https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/#comment-773369 Fri, 26 Sep 2025 01:06:13 +0000 https://www.masterorganicchemistry.com/?p=11243#comment-773369 For the answer on flashcard 6, question 2, can you help me understand why the diene was redrawn the way it was?

]]> By: James Ashenhurst https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/#comment-772949 Tue, 23 Sep 2025 00:15:04 +0000 https://www.masterorganicchemistry.com/?p=11243#comment-772949 In reply to Michael Fallentine.

Ah yes. Fixed quiz 3061. Thank you.

]]> By: Michael Fallentine https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/#comment-772624 Sat, 20 Sep 2025 00:53:58 +0000 https://www.masterorganicchemistry.com/?p=11243#comment-772624 It looks like the diene was redrawn incorrectly on the second problem of the last flashcard. It lost a carbon

]]> By: James Ashenhurst https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/#comment-732666 Thu, 03 Apr 2025 02:46:59 +0000 https://www.masterorganicchemistry.com/?p=11243#comment-732666 In reply to Ling.

Since there is no chiral influence on the reaction, an equal proportion of enantiomers is formed (racemic mixture).

]]> By: Ling https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/#comment-732631 Wed, 02 Apr 2025 21:45:30 +0000 https://www.masterorganicchemistry.com/?p=11243#comment-732631 I would like to know, in a case similar to Example 1, where the major product is an endo product, which enantiomer is the major product?

]]> By: James Ashenhurst https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/#comment-721814 Mon, 30 Dec 2024 22:17:05 +0000 https://www.masterorganicchemistry.com/?p=11243#comment-721814 In reply to Rita.

It’s a meso compound. There is an internal plane of symmetry that renders the molecule achiral overall even though it possesses chiral centers.

]]> By: Rita https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/#comment-721467 Fri, 27 Dec 2024 23:43:15 +0000 https://www.masterorganicchemistry.com/?p=11243#comment-721467 why there is no enantiomer in example 2

]]> By: James Ashenhurst https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/#comment-648158 Wed, 15 Feb 2023 02:36:58 +0000 https://www.masterorganicchemistry.com/?p=11243#comment-648158 In reply to Amrendra Kumar.

Try it for yourself. What do you think?

]]> By: Amrendra Kumar https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/#comment-648055 Mon, 13 Feb 2023 18:10:12 +0000 https://www.masterorganicchemistry.com/?p=11243#comment-648055 Really its a nice post & have great topic discussion .
its a concept booster…..
thankyou so much!
actually my query regarding this topic is that:

when cis,cis-3,4-dimethylcylobutene is subject to reaction photochemically dis-rotation ring opening, what will be the product?
either cis or trans ?

]]> By: James Ashenhurst https://www.masterorganicchemistry.com/2018/02/09/endo-exo-diels-alder-telling-them-apart/#comment-630100 Wed, 15 Jun 2022 19:00:44 +0000 https://www.masterorganicchemistry.com/?p=11243#comment-630100 In reply to Mike W.

There’s been some previous discussion on this thread regarding IUPAC and their use of exo/endo versus how the terms are actually used in practice. My general opinion on this one is that IUPAC can get stuffed because nobody follows their recommendations on this topic.
If there is a specific image that is causing confusion to you, could you specify which one (image filenames are numbered, so that would help).

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