| 11. | The last feature of this synthesis was the titanium-mediated installation of the diene.
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| 12. | In the compound on the right, the diene is homoannular with 4 alkyl substituents.
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| 13. | After 1, 4-elimination, the diene undergoes an epoxidation ( Step D ).
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| 14. | Some interesting results were that electron-withdrawing groups on the diene decreased the rate of reaction.
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| 15. | This is followed by a 1, 3-hydride shift and subsequent deprotonation to the diene.
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| 16. | The I D / I G ratio for reaction with Danishefsky s diene is 2.6.
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| 17. | However, when the dienophile substituents are endo, there is considerable orbital overlap with the diene.
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| 18. | Men and women were often arrested solely because they looked like Arabs or Middle Easterners, Diene said.
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| 19. | Manning and opposition leader Basdeo Panday should make joint statements denouncing racism, Diene said at the time.
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| 20. | Diene's visit to Trinidad followed a tour of Guyana, where the racial dynamic is similar.
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