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The Microwave-assisted Preparation and x-ray Structure of 3-Bromocarbazole-N-Acetic Acid

Chinese Chemical Letters 2001年第4期12卷 321-324页

作者： Wen Jian LAO Yu Hua ZHANG Yue Qi LIU Qiang Jin WU Zi xiang HUANG Qing Yu OU Lanzhou Institute of Chemical Physics Chinese Academy of SciencesLanzhou 730000 Fujian Institute of Research on the Structure of Matter Chinese Academy of SciencesFuzhou 350002

The rapid synthesis of 3-bromocarbarole-N-acetic acid was performed using microwave irradiation. Under the optimal conditions the yield was 85.6% . The crystal structure showed that the carboxylic groups form bifurcated hydrogen bonds and the hydroxyl oxygen atoms serve as proton donors and also acceptor. Each carboxylic group was involved in four hydrogen bonds. The package of crystal was dominated by links of these hydrogen bonds.

关键词： Microwave-assisted synthesis 3-bromocarbazole-N-acetic acid x-ray determination bifurcated hydrogen bonds.

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Synthesis,characterization and catalytic applications of triden-tate Schiff base derivatives of bis and mono(cyclopentadienyl)-lanthanocene complexes

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Chinese Journal of Chemistry 2000年第5期18卷 740-744页

作者：约瑟夫.穆罕默德刘乾才黄吉玲钱延龙 Laboratory of Organometallic Chemistry East China University of Science and TechnologyShanghai 200237 China

Seven kinds of lanthanocene complexes were prepared by the reaction of tridentate Schiff base | N-(2-methoxyphenyl)salicylideneamine with tris(cyclopentadienyl) lanthanide tetrahydrofuranate or bis (cyclopentadienyl) lanthanide chloride tetrahydrofuranate in THF. All the complexes were characterized by MS, EA and IR respectively. The structure of |Cp2LnC14U13NO2) Ln = Sm, Dy, Y, Er| (1–4) was further confirmed by x-ray determination of Cp2Sm(C14H13NO2) (1) which indicates that the complex is monomeric in which central metal is coordinatively saturated by two cyclopentadienyl rings, two oxygens and one nitrogen of the ligand. The isomerization of 1,5-hexadiene explains that complexes (1–4) isomerize this monomer into a mixture of 1,4-hexadiene, 2,4-hexadiene, 1,3-hexadiene, methylenecyclopentane and methyl–cyclopentene. Similarity complexes |CpLn(a) C14 H13NO2) (THF) (Ln=Sm, Dy, Y, Er)| (5–7) polymerize methyl-methacrylate (MMA) to give polyMMA (PMMA) in 51.8% yield and high molecular weight (274 × 103), which shows narrow molecular weight distributions and partially syndiotactic.

关键词： Lanthanocene tridentate Schiff base synthesis x-ray determination

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