New catalytic effect of thiourea on the oxidative cyanation of N-aryltetrahydroisoquinolines

Thiourea itself has been introduced as a mild and efficient organocatalyst for the oxidative α -cyanation of N-aryltetrahydroisoquinolines (THIQs) with trimethylsilyl cyanide (TMSCN), giving the corresponding products in good to excellent yields. Experimental investigations demonstrated that thiourea acts as a radical initiator by abstracting hydroxyl radical (OH) from tert-butyl hydroperoxide (TBHP) directly instead of non-covalent hydrogen bondings (H-bondings) activation. The use of thiourea as a radical initiator offers a new avenue for innovative chemical transformations in organocatalyzed radical chemistry.     

Electronic stopping powers of Ni, Gd and Pd metals for 19F ions at low energy

Summary Electronic stopping power of ¹⁹F in Ni, Pd and Gd was measured and compared to Mstar and SRIM calculation as well as experimental results published in literature. It turns out that the present electronic stopping power agrees reasonably well with them.     

奋乃静和氟奋乃静的毛细管电泳柱端喷壁式安培检测

应用自组装毛细管电泳．安培检测装置，建立了同时分离检测抗精神病药奋乃静与氟奋乃静的新方法。在1050mV(vs．Ag／AgCl)检测电位下，奋乃静与氟奋乃静的检出限分别达0．060mg／L与0．075mg／L。在最佳检测条件下，两组分的响应电流与浓度之间有着良好的线性关系，线性范围为0．75～75mg／L。将方法用于药物片剂以及模拟尿样和血清样品中奋乃静和氟奋乃静的测定，结果令人满意。     

脱蜡剂DF-1的气相色谱-傅里叶变换红外光谱联用分析

脱蜡剂ＤＦ－１是一种含多种有机成分的碳氢化合物，经气相色谱－红外光谱联用分析后，确定了这些组分的组成与含量。     

多晶顺磁共振谱的拟合

对电子自旋1/2≤S<3.5,核自旋1/2≤I<4.5和配体少于10个的顺磁体系的多晶EPR谱的拟合进行研究。在VAX-11/785计算机上用FORTRAN语言建立EPR谱模拟程序包,计算了多个例子,获得较为满意的结果。     

光谱复杂的稀土基体中稀土杂质ICP光谱测定的一些问题

ICP激发光源以其独特的功能使ICP/AES技术在稀土分析中的应用日益广泛,在一定程度上取代了经典的直流电弧光谱法,但应指出,由于常规雾化器的低雾化效率(≤5％)和试样的高倍稀释,ICP/AES技术的实际检测能力的改善并不明显,本文用ICP光谱法测定了     

The synthesis and reactins of ortho bromophenyllithium

Experimental conditions have now been developed whereby o-bromophenyllithium(II) may be prepared in excellent yields and used as an organometallic intermediate for the synthesis of a variety of ortho bromo substituted phenyl compounds (o-BrC₆H₄X). THe thermal stability, decomposition products and reactions of II wre studied. REactions between II and a variety of substrates, e.g., CO₂, dimethylformamide, fluorinated esters, hexafluorobenzene, and organosilicon chlorides were examined.     

脉冲激光光声量热装置的研制及用之对香豆素激光染料无辐射跃迁过程的研究

本文报道了一套适用于液相体系的高灵敏度脉冲激光光声量热装置的建立。用此仪器对香豆素激光染料C428, C47和C120的无辐射过程进行了研究, 测得它们在无水乙醇中的无辐射跃迁量子产额分别为0.50, 0.47和0.38。     

Diastereoselective Three Component Reaction of N‐Glyoxyloyl Camphorpyrazolidinone,Amine and Allyltributylstannane: Facile Synthesis of Homoallylic Amines

Diastereoselective allylation of imine derived from N‐glyoxyloyl camphorpyrazolidinone and amines was treated with allyltributylstannane in the presence of triflic acid. The corresponding optically enriched homoallylic amines were obtained in reasonable to high material yields and with practical levels of stereoselectivity in 10 min at ambient temperature.     

Studies on fluorenscence resonance energy transfer between CdS nanoparticles and DOCAI dyes

The water-soluble CdS nanoparticles were synthesized in aqueous solution. A novel fluorescence resonance energy transfer (FRET) system with CdS nanoparticles as energy donors and 3,30-diethyl-oxadicarbocyanine iodide (DOCAI) dyes as energy accepter has been developed.