Question

Draw the product(s) of the Diels–Alder reaction of 1,3-butadiene with trans-1,2-dibromoethene. Use wedge-and-dash bonds to show...

Draw the product(s) of the Diels–Alder reaction of 1,3-butadiene with trans-1,2-dibromoethene. Use wedge-and-dash bonds to show the stereochemistry of the product(s). Include hydrogens at any chirality centers.

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Concepts and reason

Diels–Alder Reactions:

Diels–Alder reaction is a [4 + 2] cycloaddition reaction between a conjugated diene and a dienophile (substituted alkene or alkyne) to form a substituted cyclohexene.

It is an electrocyclic reaction involves 4π electrons of diene and 2π electrons of dienophile forms new sigma bonds...

This reaction occurs in a single step with no intermediates.

Chiral Centers or Chirality Centers:

A chiral center can be a carbon atom in an organic molecule that is directly attached by four different substituents causing for optical isomerism.

Fundamentals

Diels–Alder Reactions:

new o bond
Gri -
new o bond
diene
dienophile
cycloaddition product

Reaction of diene with di- substituted dienophile:

+
enantiomer
<I-a
G2
G2
cis cycloaddition product
cis-disubstituted
Cr
+
enantiomer
G2
trans-disubstituted
trans cycloadditi

Chiral Center:

chiral center
11111ICI
H₃C
Br
on the plane (solid bond)
above the plane (wedge bond)
...||||I
below the plane (broken wedge b

Br
heat
(4+2)
concerted
IT
six membered transition state

12
I
lllll
transition state
cycloaddition products

Ans:

Br
heat
+
(4+2)
!!!!1112
cycloaddition products

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