37 research outputs found
Chemical Composition and Biological Activities of Soldiers of the Brazilian Termite Species, Nasutitermes macrocephalus
Can an Aromatic Ring Replace a Dienic System? Synthesis and Biological Activity of Analogues of (8E,10E)-8,10-Dodecadien-1-ol
Main Components of the Aggregation Pheromone of the Cuban Bark Beetle, Ips intersttialis
Biotransformations of gamma-methyl-beta-ketosulfones:stereoselectivity of 3-methyl-1-(phenylsulfonyl)hexan-2-one reductions by various yeasts
The stereoselectivity of the reduction of rac-3-methyl1-(phenylsulfonyl)hexan-2-one (1) to 3-methyl1-(phenylsulfonyl)hexan-2-ol (2) diastereomers by more than 20 yeasts was studied. Reduction of carbonyl group in 1 proceeds with a high Re-face enantioselectivity: Candida guillermondii (98.9% e.e.), C. zeylanoides (>99.9%), and Kloeckera apiculata (99.6%), respectively and the (R)-1 enantiomer usually reacted faster. The enantioselectivity was determined by GC on chiral cyclodextrine phases and absolute configurations of products were assigned by NMR spectroscopy and a chemical correlation. Copyright (C) 1996 Elsevier Science Lt
Potential of a blend of E8,E10-120H and E8,E10-12Ac for mating disruption of codling moth, Cydia pomonella L (Lep, Tortricidae)
New potential inhibitors of pheromonal attraction in the oriental fruit moth, Cydia molesta
New analogues of (Z)-dodec-8-en-1-yl acetate (Z8-12:OAc, 1), the main sex pheromone component of the Oriental fruit moth, Cydia molesta, were designed by formally transferring the terminal propyl group from the C-9 to the C-7 position to form vinyl-branched (2, 3) or, after isomerization, ethylidene-branched 4) structures and by replacing the -CH=CH- grouping by the -S-CH2- moiety (5, 6). Their biological activities were studied both electrophysiologically and behaviourally (laboratory mating and wind tunnel experiments). All the structural modifications resulted in analogues whose electroantennographic activities were lower than that of 1 following the order 1 much greater than 6 approximate to 5 much greater than 2 approximate to 4 approximate to 3. The single sensillum recording activities indicated that all the analogues stimulate the same Z8-12:OAc receptor neurone, In behavioural experiments, the analogues were generally found to reduce the ability of males to find a pheromone source, however, to different degrees. The highest inhibitory effect (90%) was observed for the thia analogues 5 and 6. The results support the view that the inhibitory properties of the analogues should not be entirely associated with their pheromone-mimicking capabilities