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Solved in 3 steps
- (1) Which is an isolated diene? (2) Which is an alkene with possible rearrangement product (1,2-H shift) with reaction to HI? (3) Whixh isa diene capable of having 1,2 and 1,4-addition products? (4) Which is a conjugated diene?17.18 Rank the following dienes in terms of reactivity in DielsAlder reactions (from least reactive to most reactive).Consider the following dienes in a Diels–Alder reaction with ethene. Which will react the fastest? Which will react the slowest? Explain
- The Birch reduction is a dissolving metal reaction that converts substituted benzenes to cyclohexa-1,4-dienes using Li and liquid ammonia in the presence of an alcohol. Draw a stepwise mechanism for the following Birch reductionRank the following dienophiles in order of increasing reactivity.Explain the Carbocation Rearrangements ?
- 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.Why a conjugated diene is more stable than an isolated diene ?1. Which among these would be the most stable carbocation?a. Allylicb. Vinylicc. Primaryd. Secondary2. What is the primary reason for the stability of tertiary carbocations?a. Free rotationb. Resonancec. Hyperconjugation
- What diene and dienophile are needed to prepare each compound by a Diels–Alder reaction?Rank the following dienes in their rate of reaction with the same dienophile in a Diels-Alder reaction. For example, 1 = fastest or most reactive diene, 4 = slowest or least reactive diene.What diene and dienophile are needed to prepare attached compound by aDiels–Alder reaction?