Results 131 to 140 of about 2,856 (184)

The Synthesis of Azadirachtin: A Potent Insect Antifeedant

Chemistry – A European Journal, 2008
AbstractWe describe in full the first synthesis of the potent insect antifeedant azadirachtin through a highly convergent approach. An O‐alkylation reaction is used to unite decalin ketone and propargylic mesylate fragments, after which a Claisen rearrangement constructs the central C8C14 bond in a stereoselective fashion.
S. V. Ley, A. Abad Somovilla, J. C. Anderson, C. Ayats, R. Banteli, E. Beckmann, A. Boyer, M. G. Brasca, A. Brice, H. B. Broughton, B. J. Burke, E. Cleator, D. Craig, A. A. Denholm, R. M. Denton, T. Durand Reville, L. B. Gobbi, M. Gobel, B. L. Gray, R. B. Grossmann, C. E. Gutteridge, N. Hahn, S. L. Harding, D. C. Jennens, L. Jennens, P. J. Lovell, H. J. Lovell, M. L. de la Puente, H. C. Kolb, W. Koot, S. L. Maslen, C. F. McCusker, A. Mattes, A. R. Pape, A. Pinto, D. Santafianos, J. S. Scott, S. C. Smith, A. Q. Somers, C. D. Spilling, F. Stelzer, P. L. Toogood, R. M. Turner, G. E. Veitch, A. Wood, C. Zumbrunn   +45 more
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Activity of quassinoids as antifeedants against aphids

Journal of Chemical Ecology, 1989
A series of quassinoids was tested for antifeedant activity against the aphidMyzus persicae (Hemiptera, Aphididae). Isobrucein B, brucein B and C, glaucarubinone, and quassin decreased feeding at concentrations down to 0.05% and isobrucein A was effective at 0.01%.
J, Polonsky, S C, Bhatnagar, D C, Griffiths, J A, Pickett, C M, Woodcock   +4 more
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Antifeedant constituents from Fagara macrophylla

Fitoterapia, 2001
Analysis of the polar fractions of an EtOH extract obtained from the bark of the African medicinal plant Fagara macrophylla led to the isolation and identification of the alkaloids oblongine (6), tembetarine (7) and magnoflorine (8) and the flavonoid hesperidin (9).
TRINGALI, Corrado, Spatafora C, Cali V, Simmonds MSJ   +3 more
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Synthesis and Antifeeding Activities of Tonghaosu Analogues

Journal of Agricultural and Food Chemistry, 2004
Tonghaosu (1), a lead for a botanical antifeedant, and its 22 analogues were synthesized according to a previously reported concise and straightforward procedure. The structures of all new compounds were confirmed by NMR, IR, MS, and HREIMS or elemental analysis. Their insect antifeedant activities against the large white butterfly (Pieris brassicae L.)
Li, Chen, Han-Hong, Xu, Biao-Lin, Yin, Chun, Xiao, Tai-Shan, Hu, Yu-Lin, Wu   +5 more
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Insect antifeedant furanocoumarins from Tetradium daniellii

Phytochemistry, 2003
The dried fruits of Tetradium daniellii yielded a new linear furanocoumarin, 5-(6-hydroxy-3,7-dimethylocta-2,7-dienyloxy)psoralen, together with six other structurally related furanocoumarins. A similar chemical profile was recorded by HPLC analysis of a fragment of T.
Philip Stevenson, Monique Simmonds, Geoffrey Kite   +2 more
exaly   +3 more sources

Attractants, Repellents, and Antifeedants

1998
The earliest record of an attractant used for economic purposes was an attempt in 1885 to control grasshoppers in California by means of attractive poisoned baits. Later, wine growers in Europe used traps baited with stale beer, sugar water, and old cider to control the grapevine moth.
A. S. Perry, I. Yamamoto, I. Ishaaya, R. Perry   +3 more
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Insect Antifeedant Activity of Clerodane Diterpenoids

Journal of Natural Products, 1994
Fourteen clerodane-type diterpenoids isolated from plants in the genera Baccharis, Teucrium, and Salvia were assayed for antifeedant activity against Tenebrio molitor larvae in order to establish structure-activity relationships. Among the compounds tested, furanoditerpenes with alpha, beta-unsaturated-gamma-lactone moieties, or C-4-epoxy substitution ...
M E, Sosa, C E, Tonn, O S, Giordano
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Antifeedant and Cytotoxic Activity of Longipinane Derivatives

Planta Medica, 2009
The polyoxygenated longipinane derivatives 1- 8 were tested as antifeedant compounds against the herbivorous insects Spodoptera littoralis, Rhopalosiphum padi, and Myzus persicae. Compounds 1-3 and 8 exhibited significant antifeedant activity against S. littoralis and M. persicae. The antifeedant activity against S.
Cerda-García Rojas, Carlos M., Burgueño-Tapia, Eleuterio, Román-Marín, Luisa U., Hernández-Hernández, Juan D., Agulló-Ortuño, María Teresa, González-Coloma, Azucena, Joseph-Nathan, Pedro   +6 more
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Insect Antifeedant Potential of Xanthohumol, Isoxanthohumol, and Their Derivatives

Journal of Agricultural and Food Chemistry, 2015
Xanthohumol (14) and isoxanthohumol (6) derived from hop (Humulus lupulus L., Cannabaceae) and selected chalcone and chromene derivatives, obtained by chemical synthesis, were studied for antifeedant activity against the peach-potato aphid (Myzus persicae [Sulz.]).
Monika Stompor, Katarzyna Dancewicz, Beata Gabryś, Mirosław Anioł   +3 more
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ChemInform Abstract: Synthesis of Insect Antifeedants.

ChemInform, 1988
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
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