About a week ago, I proposed two organic chemistry puzzles in my post Dear Diels & Alder. As promised, here are the answers to the puzzle. We did have one brilliant reader, Jack99, that answered the puzzle correctly (although it seemed that several other commenters knew the answer as well).
The puzzle questions are in the link above if you want to take a look before reading the answers.
Puzzle 1 Answer:
In this puzzle, I gave you the full reaction and asked you to fill in the arrows. The diene is colored red in the reactant and product. The dienophile is colored dark blue in the reactant and product. The two green arrows are pointed to nothing because they are both forming a new bond that are represented by black in the product. The light blue arrow is forming the double bond in the product.
Puzzle 2 Answer:
This puzzle was more difficult than the first, but similar. This time you had to guess the product AND place the arrows in the correct place. Similar to the above answer, red is the conjugated diene and dark blue is the dienophile. The green arrows are forming the new bonds and are shown in black in the product. Again, the light blue arrow forms the double bond.
Did all of you playing at home guess the answers correctly!? Hopefully, these 3D puzzles were fun. I was excited to see so much organic chemistry enthusiasm from the commenters. Let me know if there are still any questions about the puzzle answers. Again, congratulations to Jack99 for guessing the answers correctly!