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Diels-Alder: stereochemistry of diene | Organic chemistry | Khan Academy 

Khan Academy Organic Chemistry
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How to analyze the stereochemistry of the diene in a Diels-Alder reaction.
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Organic Chemistry on Khan Academy: Carbon can form covalent bonds with itself and other elements to create a mind-boggling array of structures. In organic chemistry, we will learn about the reactions chemists use to synthesize crazy carbon based structures, as well as the analytical methods to characterize them. We will also think about how those reactions are occurring on a molecular level with reaction mechanisms. Simply put, organic chemistry is like building with molecular Legos. Let's make some beautiful organic molecules!
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4 окт 2024

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Комментарии : 17   
@abbes635
@abbes635 4 года назад
thankyou and i love you
@wildzubatappeared
@wildzubatappeared 9 лет назад
U saved me thank u
@0016mohit
@0016mohit 7 лет назад
If we consider that the diene and the dienophile can be both over each other ( dienophile above , diene below and vice vers ) , how do we define endo and exo then ?
@cigzone96
@cigzone96 8 лет назад
great video! The dienes are enantiomers, so the products are also enantiomers, the dienophile is meso, I think you should say the stereochemistry is retained in diels alder rxns.
@stargazer4023
@stargazer4023 7 лет назад
No, for the examples in the video, the dienes are not enantiomers and the dienophile is not a meso compound. All of the reactions shown are actually generating two new chiral centres in the products, but the reagents themselves are achiral. Although the product at 3:28 contains two asymmetric carbons it also contains a mirror plane so is a meso compound. For the product at 5:00 and the last example, you will get a pair of enantiomers as is demonstrated.
@nicholasherz8755
@nicholasherz8755 6 лет назад
At 1:10 you said that the diene is trans with respect to the pi bonds, however, that is not the case. It is actually cis or s-cis with respect to the pi bonds, and it has to be in the s-cis conformation in order to react.
@bradleyries2817
@bradleyries2817 6 лет назад
He is referring to each individual double bond, each one being trans in their own right, while the entire diene is s-cis, like you said.
@Jakeykeywheels17
@Jakeykeywheels17 8 лет назад
can the dienophile be on the diene? and then it rearranges to react?
@saadrehman362
@saadrehman362 6 лет назад
yea
@soumithnalli5169
@soumithnalli5169 7 лет назад
you r god
@zainabrehman4330
@zainabrehman4330 4 года назад
Can you plz explain this, u said both double bond are cis in one case and the other both are trans but with respect to what are u saying that theu are cis or trans they look the same to mw
@pietrocolombo3807
@pietrocolombo3807 7 лет назад
HI where can i buy those plastic model for setereochemistry?
@nickstewart3545
@nickstewart3545 7 лет назад
you can find them very easily on amazon. Just look up molecular modeling kits and you will find it easily.
@aqualife88
@aqualife88 3 года назад
🙌🏼👍🏼👏🏼👍🏼👍🏼👍🏼👍🏼👏🏼
@ralphscianni1675
@ralphscianni1675 8 лет назад
why isn't there stereochemistry needed for the CO2Me?
@Harpreetkaur-fd6uf
@Harpreetkaur-fd6uf 8 лет назад
+Ralph Scianni .. Because that carbon is not chiral
@mollyxiong2223
@mollyxiong2223 8 лет назад
Isnt there a way we can determine stereochemistry WITHOUT looking at models.... did it not occur to him that we cant use models in exams?....
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