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Träfflista för sökning "LAR1:miun ;pers:(Högberg Hans Erik)"

Sökning: LAR1:miun > Högberg Hans Erik

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61.
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65.
  • Johansson, Björn, et al. (författare)
  • Release Rates for Pine Sawfly Pheromones from Two Types of Dispensers and Phenology of Neodiprion sertifer
  • 2001
  • Ingår i: Journal of Chemical Ecology. - 0098-0331 .- 1573-1561. ; 27:4, s. 733-745
  • Tidskriftsartikel (refereegranskat)abstract
    • Comparisons of release rates, duration in the field, and catch efficiency of polyethylene and cotton roll dispensers for the sex pheromones of sawflies (Hymenoptera: Diprionidae) were conducted. The release rates of the Neodiprion sertifer (Geoffr.) and Diprion pini (L.) sex pheromones, the acetates of pentadecanol and (2S,3S,7S)-3,7-dimethyl (2S,3R,7R)-3,7-dimethyl-2-tridecanol from polyethylene dispensers were measured at different temperatures in the laboratory. The release rates for the substances depended on both the temperature and initial load in the vials. The catch from cotton rolls baited with 100 μg of the acetate or propionate of 3,7-dimethyl-2-pentadecanol was compared to the catch from regularly renewed cotton rolls baited with 10 μg of the same acetate. The catch was higher for the 100-μg cotton rolls for, at most, 45 days, and there was no significant difference in catch between the acetate and the propionate. The catch in traps baited with polyethylene or cotton roll dispensers loaded with the acetate of 3,7-dimethyl-2-pentadecanol was compared and showed that cotton roll traps mirrored the decreasing release of the substance rather than the actual flight activity. The length of the flight period of N. sertifer in Sweden, the Czech Republic, Italy, and Greece did not exceed 100 days in any of the countries. By adjusting the initial pheromone load of the polyethylene vials to the expected temperatures, it should be possible to get a constant and sufficiently high release rate during the entire flight period.
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68.
  • Karlsson, Staffan, et al. (författare)
  • Diastereoselective addition of chiral azomethine ylides to cinnamoyl moieties, attached to chiral auxiliaries
  • 2001
  • Ingår i: Tetrahedron: Asymmetry. - 0957-4166. ; 12:14, s. 1975-1976
  • Tidskriftsartikel (refereegranskat)abstract
    • Doubly diastereoselective 1,3-dipolar cycloadditions of chiral azomethine ylides to cinnamoyl moieties, attached to chiral auxiliaries, were investigated. The resulting trans-3,4-disubstituted pyrrolidines were obtained in diastereomeric ratios of up to 78:22. The influence on this ratio by the constitution of the chiral ylide was found to be rather small.
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69.
  • Karlsson, Staffan, et al. (författare)
  • Diastereoselective addition of chiral azomethine ylides to cyclic alpha,beta-unsaturated N-enoylbornanesultams
  • 2002
  • Ingår i: Journal of the Chemical Society. Perkin Transactions 1. - : Royal Society of Chemistry (RSC). - 1472-7781 .- 1364-5463. ; 2002:8, s. 1076-1081
  • Tidskriftsartikel (refereegranskat)abstract
    • Doubly diastereoselective 1,3-dipolar cycloaddition reactions of chiral non-racemic azomethine ylides to cyclic five-and six-membered α,β-unsaturated N-enoylbornanesultams were carried out. When suitable solvents were used, the fused bicyclic adducts formed were obtained in good diastereoselectivity. Moreover, a change of the absolute configuration of the starting ylide precursor reversed the diastereoselectivity of some such reactions. Cleavage of the chiral auxiliary of the cycloadducts furnished amino alcohols and a β-amino ester. The latter was transformed into a known precursor of an antibacterial compound.
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