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对松叶蜂 diprion pini性信息素活性组分 3,7-二甲基 -2 -十三碳醇乙酸酯的全合成进行了研究 .以丙二酸二乙酯和 2 ,3-环氧丁烷为原料 ,分别合成了两个重要结构单元—— 2 -甲基 -1-辛烷基锂和 3,4-二甲基 -γ-丁内酯 .2 -甲基 -1-辛烷基锂与 3,4-二甲基 -γ-丁内酯反应 ,得到的酮醇再经黄鸣龙还原 ,得到 3,7-二甲基 -2 -十三碳醇 ,经酯化 ,得到 3,7-二甲基 -2 -十三碳醇乙酸酯 相似文献
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Protoporphyrinogen oxidase inhibitor has become the focus research field as herbicides.Seven novel N-benzoxazolonyluracils were obtained by cyclization of 6-aminobenzoxazolone derivatives with ethyl 3-dimethylcarbamoylamido-4,4,4-trifluorocrotonate and then methylation or amination, and the reaction yields were between 59%-86%. The chemical structures of the compounds were identified by Elemental Analysis, MS and ^1H NMR. Biological results indicate that some compounds exhibit excellent control of broadleaf weeds at post-emergence by low dosage 18.75 ga.i/ha, but are not effective for grass weeds below dosage 37.5 ga. i/ha. In addition, these compounds show no damage at high-dosage 150 ga. i/ha to wheat and corn, but are unsafe to dicotyledonous plants such as cole, soybean and sorghum even at lower dosage 18.75 ga. i/ha. 相似文献
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新时期如何做好中职学校班主任工作尤为重要,作者从自身经验总结出要用"心"做好班主任工作,即要用爱心、耐心、细心、信心和倾心做好新时期的班主任工作。 相似文献
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教育质量是社会关注的焦点,是学校的生命线。本文分析了影响教育质量的主要因素:教师和教育质量管理,并就对策进行了探讨。 相似文献
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以 6 氨基青霉烷酸 (6 APA)为原料 ,经重氮化、溴化、氧化、氯化、叠氮取代、环合、脱保护等 11步反应合成了 β 内酰胺酶抑制剂他唑巴坦 (Tazobactam) ,并对叠氮取代和环合进行了研究 ,成功地以醋酸乙烯酯代替乙炔进行了环合 相似文献
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Synthesis of Dibenzylidene Sorbitol Series Compound 总被引:1,自引:1,他引:1
Dibenzylidene sorbitol compounds are useful astransparency-improving agents for polypropylene andother resins, agents for gelling organic liquids, flow-ability-improving agents for paint, inks, adhesives,and other compositions, and solidifying agents for … 相似文献
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