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- When Br2 is added to buta-1,3-diene at -15 °C, the product mixture contains 60% ofproduct A and 40% of product B. When the same reaction takes place at 60 °C, theproduct ratio is 10% A and 90% B.Show why A predominates at -15 °C and B predominates at 60 °C.When Br2 is added to buta-1,3-diene at -15 °C, the product mixture contains 60% ofproduct A and 40% of product B. When the same reaction takes place at 60 °C, theproduct ratio is 10% A and 90% B.(a) Propose structures for products A and B. (Hint: In many cases, an allylic carbocationis more stable than a bromonium ion.)(b) Propose a mechanism to account for formation of both A and B.(c) Show why A predominates at -15 °C and B predominates at 60 °C.(d) If you had a solution of pure A, and its temperature were raised to 60 °C, what wouldyou expect to happen? Propose a mechanism to support your predictionWhen Br2 is added to buta-1,3-diene at -15 °C, the product mixture contains 60% ofproduct A and 40% of product B. When the same reaction takes place at 60 °C, theproduct ratio is 10% A and 90% B.If you had a solution of pure A, and its temperature were raised to 60 °C, what wouldyou expect to happen? Propose a mechanism to support your prediction.
- When Br2 is added to buta-1,3-diene at -15 °C, the product mixture contains 60% ofproduct A and 40% of product B. When the same reaction takes place at 60 °C, theproduct ratio is 10% A and 90% B.(a) Propose structures for products A and B. (Hint: In many cases, an allylic carbocationis more stable than a bromonium ion.)What is the expected product of the reaction scheme below?Rank the following dienophiles in order of increasing reactivity.
- When Br2 is added to buta-1,3-diene at -15 °C, the product mixture contains 60% ofproduct A and 40% of product B. When the same reaction takes place at 60 °C, theproduct ratio is 10% A and 90% B.) Propose a mechanism to account for formation of both A and BIn the reaction below, 3-Buten-2-one reacts with 2,3-Dimethyl-1,3-butadieneand 1,3-Butadieneat 140°C and 30°C, respectively. Explain why these two dienes react at different temperatures.The following reaction has a ΔSsystem < 0 O2(g) → 2O(g) T or F can you explain why this is false?