为了发现具有新型分子支架的绿色除草剂,使用天然四酸作为先导化合物来设计和合成四种结合了链状烷氧基烷基部分(4a–4d)和十九种吡咯烷-2,4-的吡咯烷-2,4-二酮衍生物。通过取代,酰化,环化和酸化反应掺入取代的苯氧乙基部分(10a-10s)的二酮衍生物。通过FT-IR,1 H NMR,13 C NMR和HRMS光谱分析确认了合成的目标化合物。化合物10a的单晶结构X-射线衍射分析表明,1-羟基亚乙烯基通过具有Z-构型的双键连接吡咯烷杂环的第三位置。通过培养皿培养法,以bar草(Echinochloa crus-galli)和油菜(Brassica campestris)为模型植物来评价除草活性。发现大多数目标化合物在100μgmL -1时对植物生长具有中等至良好的抑制活性。其中,化合物10q和10n对草和油菜幼苗的根系表现出最高的除草活性,相应的抑制率分别为65.6%和84.0%。该结果
Substituted 2H-[1,2,4]Triazolo[4,3-A]Pyrazines as Gsk-3 Inhibitors
申请人:Benbow William John
公开号:US20070249612A1
公开(公告)日:2007-10-25
The invention relates to compounds of formula (I) prodrugs thereof, and the pharmaceutically acceptable salts of the compounds and prodrugs, wherein R
a
, R
b
, R
1
and R
2
are as defined herein; pharmaceutical compositions thereof; and uses thereof.
Julia,M.; de Rosnay,J., Chimica Therapeutica, 1969, vol. 4, p. 334 - 343
作者:Julia,M.、de Rosnay,J.
DOI:——
日期:——
Jones; Metcalfe; Sexton, Biochemical Journal, 1949, vol. 45, p. 143,145
作者:Jones、Metcalfe、Sexton
DOI:——
日期:——
Tribological behaviour of steel-alumina sliding pairs under boundary lubrication conditions
作者:D.-H. Hwang、K.-H. Zum Ghar
DOI:10.1002/tt.3020090304
日期:2003.3
AbstractThe tribological behaviour of oil‐lubricated steel‐alumina sliding pairs was investigated using a ball‐on‐disc tribometer at room temperature. Commercial bearing balls of 10 mm diameter were mated to 99.7% Al2O3 discs, and additive‐free mineral oil was fed into the contact area. The sliding speed and the applied normal load were varied, and the initial surface roughness of the Al2O3 disc was altered using different polishing and grinding procedures. The results showed that the surface roughness of the ceramic discs dominated the tribological behaviour under the given experimental conditions. The sliding speed as well as the normal load showed less effect on the friction behaviour, but the amount of wear depended strongly on the normal load. From the results it was concluded that improvement of the surface roughness and optimised surface machining of the ceramic material can be essential for improving the tribological performance for boundary‐lubricated steel‐ceramic sliding pairs.
PATEL P. B.; TRIVEDI J. J., J. INDIAN CHEM. SOC., 1977, 54, NO 8, 765-768