微波照射合成不对称1，4－二氢吡啶的研究

微波照射合成不对称１，４－二氢吡啶的研究张雅文，沈宗旋，潘备，杨海康，陆新华，陆澄容（苏州大学化学系苏州２１５００６）关键词缩合，二氢吡啶，微波Ｈａｎｔｚｓｃｈ合成是制备１，４－二氢吡啶的经典方法。这一合成的改进方法之一是３－氨基巴豆酸酯与醛和乙酰乙...     

取代苯酚中共振增强的分子内氢键

根据晶体结构资料，计算了59个邻位取代苯酚中分子内氢键的几何．在STO－3G水平上计算了一些分子中原子部分电荷．结果表明，酚基氧与苯环上碳之间的键长，酚基上氢原子的部分电荷，酚基所在位置处的苯环环内角与取代苯酚的酸常数pKa均有近似线性关系，当邻位上存在硝基或羰基时，内氢键由于共振而得到显著的增强，据此可说明这一类酚的显著酸性     

Calculating critical relative humidity from solubility according to Pitzer ion interaction model

The solubility and the critical relative humidity (H(cr)) of 14 drugs and inorganic salts were determined, the relationship between the H(cr) and the solubility was explored theoretically, and the H(cr) was calculated in the light of Raoult's law and Pitzer ion interaction model from their solubility. The results indicate that the H(cr) values calculated by Raoult's law in high humidity (H(cr)>80%) and by Pitzer ion interaction model in low humidity (H(cr)<80%) are comparable to the measured ones.     

芳香化合物氧化溴化研究进展

芳香化合物的氧化溴化反应是合成芳香溴化物的重要方法之一.综述了近年来芳香化合物氧化溴化的研究进展,主要包括化学计量的氧化溴化和催化氧化溴化等部分,其中后者主要包括H2O2和O2作氧化剂的催化氧化溴化.     

Sodium nitrite catalyzed aerobic oxidative deoximation under mild conditions

A mild, simple process for the effective deoximation of a wide range of ketoximes and aldoximes has been developed, which utilizes available NaNO(2) as the catalyst and molecular oxygen as the green oxidant. Notably Amberlyst-15, which acts as the initiator of NaNO(2), can be reused without regeneration. This environmentally benign protocol could provide a valuable synthetic method for practical applications.     

非交联组份对端乙烯基聚环氧丙烷/聚苯乙烯网状共聚物粘弹性的影响

本文描述了端乙烯基聚环氧丙烷/聚苯乙烯网状共聚物的合成及表征。研究了非交联组份对共聚物的玻璃化转变温度T_g,贮能模量E'、耗能模量E'和阻尼系数tanδ等动态力学性能的影响,计算了试样的粘弹性参数。结果表明,非交联组份对交联网有明显塑化作用,使其T_g降低,自由体积分数和阻尼系数增大。     

Aerobic Alcohol Ammoxidation Catalyzed by Copper(I)/Amino Acid: a Scalable Protocol to Nitriles

A facile, practical and scalable catalyst system for alcohols ammoxidation into nitriles was developed using amino acid as ligand, oxygen as terminal oxidant and copper iodide(CuI) as catalyst. The catalyst system shows excellent functional groups compatibility for a wide range of testing substrates, even the substrates bearing oxidation- sensitive groups such as MeS-, alkenyl and -NH₂ can also work well. In addition, the protocol is readily scaled up to more than 20 g and the product can be obtained just through filtration or distillation without conventional column chromatography.     

Synchronization of time varying delayed complex networks via impulsive control

In this paper, we investigate the problem of synchronization for the time varying delayed complex dynamical networks via impulsive control method, several sufficient synchronization conditions are given, and we consider the impulsive control matrices are time varying delayed matrices. Furthermore, we found impulsive control does not always play an active role in synchronization although impulsive control strategy is cheaper and simpler than other control strategy. Finally, numerical simulations are also given to demonstrate the effectiveness of the proposed schemes.     

Synthesis of mesoporous NiO nanosheet and its application on mercury (II) sensor

NiO nanosheets with uniformly distributed mesoporosity were successfully synthesized on a large scale by calcination of β-Ni(OH)₂ nanosheet precursor, which was simply prepared using 1,6-hexanediamine-assisted solution approach. The as-prepared mesoporous NiO nanosheets have been introduced for the first time for the sensing of mercury ions, which were found to be useful for selective electrochemical detection of Hg²⁺ with a linear range of 0.8 to 500?μM in pH?6.0 phosphate-buffered solutions, providing us another opportunity for exploring new electrochemical application of NiO nanomaterials.