Diels-Alder Reaction: Predict Product | 65 Characters

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The discussion revolves around predicting the product of a Diels-Alder reaction involving a diene and methyl 2-butenoate. Participants clarify that the methyl ester and hydrogen can be oriented either out of or into the plane of the paper without being incorrect, as the endo rule does not apply in this case. Methyl 2-butenoate is confirmed as a dienophile, and its double bond configuration is identified as Z. The diene in question is not cyclic, and both substituents should ideally be oriented in a syn fashion. Overall, the conversation emphasizes the importance of understanding molecular orientation in Diels-Alder reactions.
thE3nigma
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Hi,

This is not a homework question but something I found within my textbook. I just wanted to understand a solution they gave to the problem.

The question is:
Predict the product of the following Diels-Alder reaction:

The structures of two molecules, a diene (4 carbons long) and a methyl butyrate (methyl butanoate).

The answer has the methyl ester and H atom popping out of the book. I just wanted to confirm that it would not be wrong if it was drawn with the methyl ester and H atom going into the book would it? I do not think this is an endo substituent in this case.
 
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Is methyl butyrate a dienophile? Not in my books.
 
Sorry, I misspelled the molecules name. It is methyl 2-butenoate (I believe that is the correct name). There is a double bond between the second and third carbon after the COO- group.
 
... and is the diene cyclic? Is that methyl-2-butenoate E or Z?
 
It is Z, the diene is not cyclic.
 
Endo isn't the right term to use in this system. http://www.iupac.org/goldbook/E02094.pdf"

Both the methyl ester and the methyl group should be either up or down... syn fashion.
 
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