马来酸酐与1，2－环己烷二羧酸二异丁酯的气液平衡

采用小沸点仪测定了马来酸酐和1,2－环己烷二羧酸二异丁酯二元系统在不同配料组成条件下的温度与压力数据，并通过内插法得到不同压力下的温度与配料组成的数据.进一步采用单纯形法优化NRTL方程参数，推算了平衡气液相组成，发现该二元系统具有最高压力恒沸点，且该恒沸点随压力的变化显著.当压力降低至20 kPa时, 由温度随气相组成的变化趋势知该恒沸点将趋于消失.     

Selective Oxidation of Methane to Methanol Using Molecular Oxygen on MoOx／（LaCoO3＋Co3O4） Catalysts

Comparatively high CH3OH selectivity (60.0%) and yield (6.7%) were obtained on MoOx/(LaCoO3 Co3O4) catalysts in selective oxidation of methane to methanol using molecular oxygen as oxidant. The interaction between MoOx and La-Co-oxide modified the molecular structure of molybdenum oxide and the ratio of O^-/O^2- on the catalyst surface, which controlled the catalytic performance of MoOx/(LaCoO3 Co3O4) catalysts.     

Inorganic—Organic Hybrid 18—Molybdodiphosphate Nanoparticles Bullk—modified Carbon Paste Electrode and Its Electrocatalysis

A kind of inorganic‐organic hybrid 18‐molybdodiphosphate nanoparticles ([(C₄H₉)₄N]₆P₂Mo₁₈Q₆₂·4H₂O) was firstly used as a bulk‐modifier to fabricate a three‐dimensional chemically modified carbon paste electrode (CPE) by direct mixing. The electrochemical behavior of the solid nanoparticles dispersed in the CPE in acidic aqueous solution was characterized by cyclic and square‐wave voltammetry. The hybrid 18‐molybdodiphosphate nanoparticles bulk‐modified CPE (MNP‐CPE) displayed a high electrocatalytic activity towards the reduction of nitrite, bromate and hydrogen peroxide. The remarkable advantages of the MNP‐CPE over the traditional polyoxometalates‐modified electrodes are their excellent reproducibility of surface‐renewal and high stability owing to the insolubility of the hybrid 18‐molybdodiphosphate nanoparticles.     

Synthesis and Structure of Dimolybdenum Carbonyl Thiolate Compound [Et4N]2[Mo2（CO）8（SC6H4—CH3—m）2]

1 INTRODUCTION In 1984, thiolate ligand was successfully introduced into molybdenum carbonyl compound by the reaction of Mo(CO)6 with [Et4N]SR( R = C6H5, But) in a moderate condition[1]. From then on, a series of dinuclear molybdenum(0) carbonyl thiolate compounds have been synthesized and characterized by using a variety of thiolate ligands in our research group. It was found that a planar Mo2S2 unit is in the compound [Et4N]2[Mo2(CO)8(SC6H4-CH_3-p)2][2] (2) and a "butterfly" t…     

磷钼钒杂多酸在苯直接羟化反应中的催化作用——O2活化机理的探讨

磷钼钒杂多酸在有供电子体存在下具有活化氧和使苯直接羟化的催化性能。以抗坏血酸和亚硫酸钠为还原剂的实验表明不同的还原体系吸氧动力学和羟化活性不同。根据氧化还原滴定、循环伏安法、电解还原羟化反应以及光谱实验等测定结果, 对这两个不同体系提出了各自可能的氧的活化机理。认为在以抗坏血酸为还原剂的情况下, 杂多酸阴离子通过三电子传递过程直接络合氧, 氧与阴离子形成中间络合物为控制步骤。在以亚硫酸钠为还原剂的情况下, 供电子体可能先与阴离子络合活化, 直接参与氧的活化过程, 供电子体与阴离子的还原络合为控制步骤。     

酞侧基聚芳醚砜和聚芳醚酮共混物的高温流变行为

用锥板粘度计测试了酞侧基聚芳醚砜（ＰＥＳ－Ｃ）和酞侧基聚芳醚酮（ＰＥＫ－Ｃ）及其共混物的熔体流变行为．试样的流动活化能分别为１４５、１３３和１１２ＫＪ／ｍｏｌ．共混物的熔体粘度显著低于ＰＥＳ－Ｃ和ＰＥＫ－Ｃ粘度的对数加和值．并证明试样的熔体流动性和加工稳定性都已达到注射成型工艺的要求．     

吸热碳氢燃料裂解镧改性混合型催化剂的研究

制备了吸热型碳氢燃料NNJ-150和镧离子交换改性的USY、ZSM-5分子重申及混合分子筛，考察了NNJ-150在USHY、HZSM-5和两者混合物以及镧改性单分子筛和混合分子筛催化剂上的裂解反应。结果表明，ZSM-5分子筛中添加镧，对NNJ-150的单分子裂解反应有明显影响；混合分子两种分子筛之间存在协同作用，低温（500℃）下，LaUSY LaZSM-5（75：25）混合分子筛对低碳烯烃的选择性较高（41.48％），催化剂寿命较长（35min以上），能有效提高吸热型碳氢燃料NNJ-150的吸热能效。     

Total synthesis of crotophorbolone

As a natural diterpenoid, crotophorbolone possesses a challenging trans,trans-5/7/6 framework decorated with six contiguous stereogenic centers and is structurally and biogenetically related to tigliane-type diterpenoids with intriguing bioactivities such as phorbol and prostratin. Based on the convergent strategy, we completed an eighteen-step total synthesis of crotophorbolone starting from (−)-carvone and (+)-dimethyl-2,3-O-isopropylidene-l-tartrate. The key elements of the synthesis involve expedient installation of the six-membered ring and the five-membered ring with multiple functional groups at an early stage, cyclization of the seven-membered ring through alkenylation of the ketone between the five-membered ring and the six-membered ring, functional group-sensitive ring-closing metathesis and final selective introduction of hydroxyls at C₂₀ and C₄.

Convergent total synthesis of crotophorbolone was accomplished in 18 longest linear steps. Observation of unexpected thermodynamic stability of a cis,trans-5/7/6 tricycle would benefit synthetic design of tigliane- and daphnane-related diterpenoids.     

（η^2—C60）[Pt（PPh3）2]8的合成与表征

C60是高度共轭的宠状结构碳素体．分子结构中六元环间的共价碳碳双键是富电子区，其反应性能与烯键类似，以碳碳双键与中心金属形成η2配位化合物．富勒烯η2配合物的合成及性能研究是当前研究热点之一[1~7]．本文在（η2-C60）［Pt（PPh3）2］n（n=1～6）系列研究[7]的基础上制备了（η2－C60）［Pt（PPh3）2］8，并用元素分析、红外光谱和光电子能谱进行鉴定和表征．1实验部分四（三苯基膦）合铂Pt（PPh3）4按文献[8]方法制备；C60纯度为99％；其余试剂均为分析纯．元素分析在ERLA－1106型元素分析仪上进行；光电子能谱在VGESCA…     

Four levels of pattern recognition

Problems of pattern recognition in chemistry and other subjects can be divided conveniently into four different types depending on the level of scope of the problem.(1) Classification into one of a number of defined classes. As an example blood samples taken from persons known to be either controls or welders are considered. The problem is whether trace element concentrations in these samples contain information on whether or not a person is a welder.(2) Level 1 plus the possibility that an object is an outlier, i.e. does not belong to any of the defined classes. As an example, the üse of ¹³C-n.m.r. data to decide whether 2-substituted norbornanes have the exo or endo structure is discussed. (2A) Level 2, asymmetric. This situation occurs when one class does not have a systematic structure, but another class is homogeneous and can be described by a level 2 model. This occurs in the classification of materials or compounds as good or bad, active or inactive, and in binary classifications. As an example the use of trace element data to classify steel samples as having good or poor properties of strength is discussed.(3) Level 2 plus the ability to relate the variables measured to external properties of continuous character. As an example, the classification of a series of chemical compounds as β -receptor blockers, β -receptor stimulants, or neither, on the basis of their structural variables is discussed. In addition, relations between these structural variables and the measured biological activity are sought within each of the two classes.(4) Level 3 with the difference that several external property variables in the objects are measured. It may be desirable to use variables of the objects both for classification and for relations to several property variables: such examples are numerous in analytical chemistry.