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Side-product inhibition of the catalyst in electrophilic aromatic substitutions and Friedel-Crafts reactions (1993)

Cornélls, A. ; Laszlo, P. ; Wang, S. -F.

Springer

Catalysis letters 17 (1993), S. 63-69

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ISSN: 1572-879X

Keywords: Modified clay catalyst ; “clayzic” ; catalyst poisoning ; chelation

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Electrophilic substitutions on aromatics such as C6H5X often lead to mixtures of the ortho- and para-disubstituted products C6H4XY. The former can chelate a metallic center and hence be a potential catalyst inactivator, whenever the (X, Y) substituents have atoms with lone pairs. This general principle operates in the Friedel-Crafts acylation of anisole, a reaction of industrial importance.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00763928

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Nα-quinaldyl-L-arginine·HCl, a new defensive alkaloid fromSubcoccinella-24-punctata (Coleoptera, Coccinellidae) (1996)

Wang, S. F. ; Braekman, J. C. ; Daloze, D. ; [et al.]

Springer

Cellular and molecular life sciences 52 (1996), S. 628-630

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ISSN: 1420-9071

Keywords: Coleoptera ; Coccinellidae ; Subcoccinella-24-punctata ; chemical defense ; quinoline alkaloid ; Nα-quinaldyl-L-arginine·HCl

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Abstract The isolation of Nα-quinaldyl-L-arginine·HCl (1) from the CoccinellidaeSubcoccinella-24-punctata is reported. The structure, first established on the basis of the analysis of the spectral properties of1, has been confirmed by synthesis. The alkaloid is of endogenous origin and markedly deterrent to ants.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01969744

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Attraction responses of the American cockroach to synthetic periplanone-B (1981)

Chow, Y. S. ; Wang, S. F.

Springer

Journal of chemical ecology 7 (1981), S. 265-272

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ISSN: 1573-1561

Keywords: Sex pheromones ; cockroach ; Periplaneta americana ; Orthoptera ; Blattidae ; periplanone-B ; margarine oil ; sex ratio ; control

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology

Notes: Abstract Synthetic periplanone-B has been shown not only to be a sex excitant to malePeriplaneta americana by bioassay in the laboratory but also an attractant pheromone by field tests in a rice storage house in Taipei. During both summer and winter months, it attracted signincantly more adult males into the traps used in the experiments than adult females. There is a statistically significant increase in the sex ratio (male-female) of the trapped adults with increase in periplanone-B used. An attempt has been made to explain the trapping of females and nymphs in addition to males by the chemicals used in our tests.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00995749

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