微波促进的N-取代2,3,3a,4,7,7a-六氢异吲哚-1,3-二酮的Beller法合成

A rapid and facile synthesis of N-substituted 2,3,3a,4,7,7a-hexahydroisoindole-l,3-dione derivatives via microwave-promoted Beller three-component domino reaction of α,β,-unsaturated aldehydes, amides and N-substituted maleimides was described.     

Determination of nickel in biological samples by ETA-AAS and ICP-AES after acidic dissolution (with microwave heating and preconcentration by liquid-liquid extraction)

The determination of nickel by ETA-AAS and ICP-AES in biological samples with prior extraction into methyl isobutyl ketone with 1,5-bis(di-2-pyridylmethylene) thiocarbonohydrazide as extracting reagent is described. Microwave dissolution in closed teflon vessels has been used for the dissolution of biological materials. At least three samples can be decomposed simultaneously with a preset heating programme. Results of analyses of some certified biological reference materials are given.     

纳米空腔堆积的一维碳纳米结构的合成与表征

Quasi-periodically intermittent hollow-cavity-stacked one-dimensional carbon nanostructures were obtained by microwave plasma chemical vapor deposition from the mixture of CH₄ and N₂ on Fe/γ-Al₂O₃ catalyst. This structure was characterized by transmission electron microscope (TEM), high-resolution TEM and X-ray energy dispersive spectral analysis. The results indicate that the trace impurity of nitrogen might account mainly for the formation of these novel nanostructures. The structural units in these one-dimensional carbon nanostructures are full of nanocavities, which may be of potential importance in hydrogen storage.     

Controlled microwave heating in modern organic synthesis

Although fire is now rarely used in synthetic chemistry, it was not until Robert Bunsen invented the burner in 1855 that the energy from this heat source could be applied to a reaction vessel in a focused manner. The Bunsen burner was later superseded by the isomantle, oil bath, or hot plate as a source for applying heat to a chemical reaction. In the past few years, heating and driving chemical reactions by microwave energy has been an increasingly popular theme in the scientific community. This nonclassical heating technique is slowly moving from a laboratory curiosity to an established technique that is heavily used in both academia and industry. The efficiency of "microwave flash heating" in dramatically reducing reaction times (from days and hours to minutes and seconds) is just one of the many advantages. This Review highlights recent applications of controlled microwave heating in modern organic synthesis, and discusses some of the underlying phenomena and issues involved.     

6,7-二甲氧基-4-(3′-三氟甲基)苯胺基喹唑啉的快速合成与体外活性测定

以6-氨基藜芦酸和甲酰胺为起始原料,在三氯氧磷存在下经“一锅法”直接合成了6,7-二甲氧基-4-氯喹唑啉(1),1与间三氟甲基苯胺在无溶剂条件下经微波辐射得到标题化合物,其结构经1H NMR,IR,MS和元素分析确证,并测定了其体外抗肿瘤活性。     

Dialdehyde in Heterocyclic Synthesis： Synthesis of Compounds Containing Two 4H-Benzopyran Building Blocks under Microwave Irradiation

The syntheses of 4H-benzopyran derivatives were investigated using dialdehyde as a key starting material. The reaction proceeds under microwave irradiation in good yield (87%--95%) with short reaction time (5--8 min),therefore providing a rapid and efficient method of synthesizing a variety of compounds containing two 4H-benzopyran units.     

Microwave-Assisted Elemental-Direct-Reaction Route to Nanocrystalline Copper Sulfides Cu9S8 and Cu7S4

Non-stoichiometric copper sulfides Cu₉S₈ and Cu₇S₄ nanocrystallites were synthesized by the reaction between elements S and Cu under microwave radiation for several minutes. The products were analyzed by using XRD, TEM, XPS, ICP and PL.     

微波辐射促进N－烷基化邻硝基苯胺的合成

报道了微波辐射促进芳香氯与胺衍生物的亲核取代反应，应用这一新的有效合 成方法能以50％－99％的产率快速合成N－烷基化邻硝基苯胺构建单元。     

微波辐射下无溶剂合成4－芳基－5－乙氧羰基－6－甲基-3，4－二氢吡啶－2－酮

以芳醛、乙酰乙酸乙酯、麦氏酸和醋酸铵为原料，在无溶剂条件下用微波辐射 后合成了一系列4－芳基－5－乙氧羰基－6－甲基－3，4－二氧吡啶－2－酮。     

Kinetics and reaction mechanism of phenol hydroxylation catalyzed by La-Cu_4FeAlCO_3

Phenol hydroxylation is an industrially important reaction, whose main products are catechol and hy-droquinone being diverse applications which are im-portant intermediates for perfumes, drugs, and phar-maceuticals and so on[1]. The processes using H2O2 a…