Photochemical reactions of di(naphthyl-1-methyl)mercury in various solvents

It was found that the photolysis of di(naphthyl-1-methyl)mercury (1) gives 1,2-dinaphthylethane (2) in heptane and benzene solvents and 2 and 1-methylnaphthalene in isopropanol and acetonitrile. Irradiation of 1 in carbon tetrachloride gives 2 and ClHgCH₂C₁₀H₇ as primary reaction products, while the chloride is further photolyzed to 2. Quantum yields of the photolysis of 1 are high and equal to unity almost for all solvents. The chloride photodecomposition yield is an order of magnitude lower (0.1).     

超级微波消解-电感耦合等离子体发射光谱（ICP-OES）法测定土壤中18种元素

为提高土壤多元素同时检测的效率,采用超级微波消解-电感耦合等离子体发射光谱法测定土壤中钾、钠、钙、镁、铜、铁、锰、锌、磷、硫、硼、砷、镉、铬、铅、钴、镓、锂等18种元素含量。比较了超级微波消解、常规微波消解和电热板消解的处理效果,采用超级微波消解法对样品进行前处理,并优化了消解条件。在最优条件下,各元素的检出限在0.05~20 mg/kg,加标回收率在86.2%~107.5%,RSD在0.1%~3.0%,方法准确度及精密度可以满足多元素同时测定的需求,且该方法具有简单、快速、成本低、用酸量少、重现性好等特点。     

A Thermal Non-Neutral Plasma Column and Its Dispersion Relation

In this paper we study the dispersion relation of thermal non-neutral plasma column by MHD theory. We use the dispersion relation to discuss the stability and dispersive properties in a non-neutral plasma-filled waveguide. The results are in agreement with those of cold non-neutral plasma.     

THE OVERLAP OF MAGNETIZATION AND THE COUPLING OF IMPURITIES WI丁H LATTICE FOR DM SPIN GLASS

The overlap of magnetization of the giound state in a RKKY spin glass system with the Dzyaloshinsky-Moriya interaction is studied based on the theory of infinite number of order parameter. It is shown that the nonmagnetic impurities are coupled with the host lattice.The results are in good agreement with experiments.     

青蒿素转化成异氢化青蒿酸及有关反应

本文报道从青蒿素经六步反应转化成异氢化青蒿酸。青蒿素经酸处理得失碳倍半萜内酯3,3经硷水解再酯化生成α,β-不饱和酮酯5,然后由Wittig反应得共轭双烯酯6,用RaneyNi(W_2)催化氢化生成异氢化青蒿酸酯7,最后经硷水解得到异氢化青蒿酸8。     

芫花有效成分的研究——Ⅲ.新的二萜原酸酯芫花酯丙的分离与结构

瑞香科植物芫花的花以乙醇提取,除分得芫花酯甲、酯乙外,尚分得新的二萜原酸酯芫花酯丙。根据光谱和化学反应确定其结构为1。从该植物根的石油醚提取物中分得已知二萜原酸酯-12-苯甲酰氧基瑞香毒素(2)。1和2均对皮肤有刺激作用,1对孕猴具有引产作用。     

Theory of relaxation spectra of polymer networks with interchain friction and long-range hydrodynamic interactions

The dynamic network model taken into account the friction relative to incompressible effective viscous medium (EVM), the hydrodynamic interactions of a network with the EVM, and the interchain friction is considered. Two collective network relaxation spectra (RS) arise. The first RS corresponds to the network motion relative to immobile EVM, the EVM does not take part in this motion. The second RS includes the combined viscous motion of the network and EVM because of long-range hydrodynamic interactions. This RS is finite and narrow for infinitely large network. The symmetry of this motion is in concordance with that of incompressible EVM. The existence of interchain friction leads to the narrowing of both types of relaxation spectra.     

二分图中关于Enomoto问题的结果

设k,n1和n2是3个正整数,G=（V1,V2;E）是一个二分图,使得｜V1｜=n1,｜V2｜=n2,其中n1≥2k＋1,n2≥2k＋1并且n1-n2≤1．如果对任意不相邻的x∈V1和y∈V2,都有d（x）＋d（y）≥2k＋2,则G包含k个相互独立的圈．以上结果部分地回答了Enomoto提出的关于二分图有独立圈的问题．     

Electroreduction of cationic fluorene complexes of manganese

Using cyclic voltammetry method, the reduction of cationic η⁶-fluorene complexes of manganese [(η⁶-9-R-C₁₃H₉)Mn(CO)₂L]PF₆ (L = CO, R = H (1 ⁺); L = CO, R = CH₃ (2 ⁺); L = PⁿBu₃, R = H (3 ⁺); L = CO, R = ^tBu (4 ⁺)) is studied. It is shown that, depending on the nature of a substituent in the position 9 of the fluorene ligand, the reduction occurs either with the detachment of an H atom from position 9 to give zwitterion compounds (complexes 1 ^±, 2 ^±, 3 ^±) or with the attachment of an H atom into the coordinated ring of the fluorene ligand to given η⁵-cyclohexadienyl complex (η⁵-9-^tBu-C₁₃H₉)Mn(CO)₃ (5).