Immobilization of HX：[Hmim]X as Halogenating Agent, Recyclable Catalyst and Medium for Conversion of Alcohols to Alkyl Halides

HX is immobilized by reaction of halogen acid with methylimidazole, and the formed ionic liquid [Hmim]X was used as halogenating agent, catalyst as well as medium for conversion of alcohols to alkyl halides. Excellent yields were obtained. The halides produced could be easily separated from the reaction mixture via simple decantation, and the ionic liquid [Hmim]X could be regenerated conveniently by adding equivalent of halogen acids followed by removal of water.     

关于电视机的两个物理问题

1为什么有极少数的电视机关机后荧光屏上会有暗斑? 夜晚,打开电视机,在工作一段时间之后,关闭电视机电源及室内的灯光,在黑暗的背景下,有极少数的电视机荧光屏上会出现不规则的暗斑.     

微型光波导陀螺中无源环形谐振器研究

光波导无源环形谐振器是微型光波导陀螺的核心敏感部件，其性能直接影响陀螺的极限分辨率和各误差项，是此种陀螺设计和制造中的关键。本文通过理论分析，对无源环形谐振器进行了深入的研究，提出了可行的光学系统设计，并结合现有先进的光学工艺，提出了加工与制造的方案。     

A Convenient Preparation of N-Alkyl-2,5-dihydroisoxazoles from O-Allyl Oximes

The organoselenium-induced ring-closure reaction of O-allyl oximes gave cyclic iminium salts, which reacted with Grignard reagents to produce N-alkyl-4-phenylselenoisoxazolidines. 2,5-Dihydroisoxazoles could be obtained in good yields by subsequent selenoxide syn-elimination.     

5,10,15,20—四（3—溴—4—磺酸苯基）卟啉高效液相色谱法测定河水中微量…

研究了新合成的显色剂５，１０，１５，２０－四（３－溴－４－磺酸苯基）卟啉与Ｃｏ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｕ（Ⅱ）形成配合物离子的反应，在ＺＯＲＢＡＸ ＯＤＳ柱上，用含２０ｍｍｏｌ／Ｌ乙酸－乙酸钠（ｐＨ６．０）和１０ｍｍｏｌ／Ｌ四乙基碘化铵的乙腈－水（２７：７３，Ｖ／Ｖ）流动相洗脱，在４２０ｎｍ波长下检测。Ｃｏ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｕ（Ⅱ）螯合物在９ｍｉｎ内获得完全分离，检测限分别为０．２ｎｇ，０．０５     

两个单核镉、锌配合物M（2－SC_5H_3NH－3－SiMe_3）_2Cl_2（M＝Cd，Zn）的合成与晶体结构

以大空阻的３．三甲基硅－吡啶－２－硫酚为配体，合成了２个单核镉、锌配合物，并用Ｘ射线单晶衍射法测定了其晶体结构．