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Stability of contact insecticides. III —allethrin, DDT and BHC in ultra‐violet light
Author(s) -
Blackith R. E.
Publication year - 1952
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740031008
Subject(s) - chlorine , chemistry , ultra violet , benzene , photodegradation , irradiation , photodissociation , environmental chemistry , chlorine atom , photochemistry , nuclear chemistry , chromatography , organic chemistry , medicinal chemistry , materials science , physics , optoelectronics , photocatalysis , nuclear physics , catalysis
Allethrin, the (±)allylrethronyl ester of (±) trans ‐ and (±) cis ‐chrysanthemic acids, is more stable to ultra‐violet photolysis than the natural pyrethrins. It is less well protected by benzeneazo‐β‐naphthol, so that the natural and synthetic insecticides have a similar stability in protected films. DDT decomposes in oil solution at almost the same rate as the pyrethrins when irradiated by ultra‐violet light, and is also protected to a similar extent by benzeneazo‐β‐naphthol. DDT, the pyrethrins, and benzeneazo‐β‐naphthol all absorb ultra‐violet light strongly at about 2200–2400 Å. Some alleged DDT synergists were investigated, but no synergistic effect was detectable with the assay system used. BHC is stable to ultra‐violet irradiation, as is expected from its formation from an irradiated chlorine‐benzene mixture.