Asymmetric Diels-Alder Reaction of 1-(S_R)-p-Tolylsulfinyl-3-penten-2-one with Cyclopentadiene Catalzed by a Chiral Titanium Reagent

Double asymmetric Diels-Alder reaction of 1(SR)-p-Tolylsulfinyl-3-penten-2-one with cyclopentadiene using a chiral titanium reagent was performed. The diastereoselectivity dependent on the size of aryl substituent involved in the chiral ligands was discussed Absolute configuration of the cycloadducts was conformed. Dramatic reversal of selectivity is observed.

益威杀虫灵水性乳剂的研究

益威杀虫灵是仲丁威—S_R—生物丙烯菊酯水性乳剂,它是以适宜乳化剂、溶剂将仲丁威、S_R—生物丙烯菊酯分散于水相中,形成澄清、透明水性微乳体系,性能稳定,经55℃热处理储存,其物理性状与生物效果无明显变化。实验室生物测试,在10.4mgai/m^3剂量,蚊虫KT_(50)为149.4～229.2秒,蝇为189.6～382.2秒,24小时死亡率为100％;对蚊幼虫及蛹有良好杀灭效果,对蛹效果尤其显著。制剂经毒理试验属低毒级。本制剂还具有无色、无异臭、喷药后无药斑的优点。