| 1. |
- Baker, T. C., et al.
(författare)
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Isolation, identification and synthesis of sex pheromone components of the carob moth, Ectomyelois ceratoniae
- 1989
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Ingår i: Tetrahedron Letters. - 0040-4039. ; 30:22, s. 2901-2902
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Tidskriftsartikel (refereegranskat)abstract
- The sex pheromone of females of the carob moth, Ectomyelois ceratoniae, was identified to be a mixture of (Z,E)-9,11,13-tetradecatrienal, (Z,E)-9,11-tetradecadienal and (Z)-9-tetradecenal in the ratio of 10:1:1. A synthetic blend proved to be attractive. GC/EAD + GC/MS investigations showed (Z,E)-9,11,13-tetradecatrienal, (Z,E)-9,11-tetradecadienal and (Z)-9-tetradecenal to be the sex pheromone of the carob moth. Blends of synthetic compounds are active.
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| 2. |
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| 3. |
- Rehnberg, Nicola, et al.
(författare)
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Total synthesis of the lignans (-)- and (+)-burseran, (-)-cubebin, and (-)-hinokinin by diastereoselective conjugate addition of benzyl anions to 2-(R) and (s)-benzyloxy-2,5-dihydro-4-(3,4-methylenedioxybenzoyl)furan
- 1988
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Ingår i: Tetrahedron Letters. - : Elsevier BV. - 0040-4039. ; 29:29, s. 3599-3602
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Tidskriftsartikel (refereegranskat)abstract
- 1,2-Addition of 3,4-methylenedioxymagnesium bromide to 2-(R) and (S)-benzyloxy-2,5-dihydro-4-furancarboxaldehyde, followed by oxidation, gave the title ketones (3r and 3s). Conjugate addition of the anions of 3,4,5-trimethoxy- and 3,4-methylenedioxybenzaldehyde diphenylthioacetal to 3r and 3s and Raney-nickel desulfurisation, followed by hydrogenolysis under various conditions, gave the title lignans. (-)-Burseran was prepared in >98% diastereomeric excess.
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| 4. |
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| 5. |
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| 6. |
- Bäckvall, Jan-Erling, et al.
(författare)
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Evidence for (π-allyl)palladium(II)(quinone) complexes in the palladium-catalyzed 1,4-diacetoxylation of conjugated dienes
- 1988
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Ingår i: Tetrahedron Letters. - 0040-4039 .- 1359-8562. ; 29:18, s. 2243-2246
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Tidskriftsartikel (refereegranskat)abstract
- Evidence for a coordination of p-benzoquinone to palladium in [4-acetoxy-η3-(1,2,3)-cyclohexenyl]-palladium(II) complexes was provided by changes of the 1H NMR chemical shift values of the π-allyl protons and a decrease of the spin-lattice relaxation time constant for the p-benzoquinone protons. The intermediate (π-allyl)palladium(benzoquinone) complexes previously postulated in palladium-catalyzed 1,4-oxidations of 1,3-dienes were detected by NMR spectroscopy.
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| 7. |
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