er reaction Conjugation, Resonance and Dienes Chapter 16 dienophile react in a D
ID: 863363 • Letter: E
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er reaction Conjugation, Resonance and Dienes Chapter 16 dienophile react in a Diels-Alder CH3 C. 16.18 Draw the product formed when each diene and Problem 16.18 COOCH3 15 Specific Rules Governing the Diels-Alder Reaction 16.13A Diene Reactivity Rule [1] The diene can react only when it adopts the s-cis conformation. 16. Several rules govern the course of the Diels-Alder reaction eaction to Both ends of the con jugated diene must be close to the bond of the dienophile for r occur. Thus, an acyclic diene in the s-trans conformation must rotate about the central C-ca bond to form the s-cis conformation before reaction can take place s rotate rotate s-trans strans reactig s-cis reacting conformation s-trans s-cis reacting conformation This rotation is prevented in cyclic dienes. As a result: double bonds are constrained in the s-cis conformation, the diene is unusually When the two reactive When the two unreactive When the two double bonds are constrained in the s-trans conformation, the diene is an s-cis 1,3-diene very reactive an s-trans 1.3-diene unreactive diene Problem 16.19 Rank the following dierExplanation / Answer
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