Synthesis and insecticidal activities of novel N-sulfenyl-N'-tert-butyl-N,N'-diacylhydrazines. 3. N-(alkyldithio), n-(aminothio), and N,N-dithio derivatives

A series of novel N-(alkyldithio) and N-aminothio derivatives of N'-tert-butyl-N,N'-diacylhydrazines were designed and synthesized as insect growth regulators via the key intermediates N-chlorosulfenyl-N'-tert-butyl-N,N'-diacylhydrazines. A series of novel N,N-dithio derivatives were also designed and synthesized with N'-tert-butyl-N,N'-diacylhydrazines and sulfur chloride in the presence of sodium hydride. Compared to the parent compounds, these derivatives displayed better solubility and improved hydrophobicities. The insecticidal activities of the target compounds were evaluated. The results of bioassays showed that the target compounds possessed comparable activities against oriental armyworm with the corresponding parent compounds. In particular, N-(morpholinosulfenyl)-N'-tert-butyl-N-4-ethylbenzoyl-N'-3,5-dimethylbenzoylhydrazide (IIIk) has higher toxicities against oriental armyworm and diamondback moth than the parent compound, RH-5992.     

Abstracts of Soil Science and Plant Nutrition,Vol. 51, No. 7 (2005)

(pp. 130–134)

News (pp. 135–137)     

Terrestrial amphipods (crustacea,amphipoda, F. Talitridae) and soil respiration

The respiration rates of cores of soil taken from wet sclerophyll forest in Tasmania were measured in microcosms without any macrofauna, with additions of the amphipod Talitrus (Keratroides) vulgaris, with additions of Talitrus (Keratroides) angulosus and with additions of equal numbers of both species. The addition of the amphipods raised the soil respiration rate and the increase was correlated with the activity of the added animals. The addition of equal numbers of both species increased the soil respiration significantly more than the same numbers of either species alone.