Synthesis of nanometer-sized homo- and heteroorganometallic tripodaphyrins
摘要:
Tripodaphyrins are tetrahedral or pyramidal assemblies in which a porphyrin macrocycle situated on the top of the molecule is ''supported'' by three ''legs'' consisting of linear arrays of covalently linked rigid constitutive elements. The edge-length at the ''base'' of the molecules which have been synthesized until now lies in the range from 3.2 to 6.5 nm. In some tripodaphyrins (3a-c) the chromophore situated on the top of the molecule differs on the complexed metal ion from the other three, which are located at the ends of the ''legs''. Owing to the dimensions of the molecules, no intramolecular interaction between the chromophores is observed, even in the presence of a paramagnetic Cu(II) chelate. (C) 1997 Elsevier Science Ltd.
Half-Sandwich Ruthenium Carbene Complexes Link<i>trans</i>-Hydrogenation and<i>gem</i>-Hydrogenation of Internal Alkynes
作者:Alexandre Guthertz、Markus Leutzsch、Lawrence M. Wolf、Puneet Gupta、Stephan M. Rummelt、Richard Goddard、Christophe Farès、Walter Thiel、Alois Fürstner
DOI:10.1021/jacs.8b00665
日期:2018.2.28
E-alkenes are formed by trans-delivery of the two H atoms of H2. A combinedexperimental and computational study now provides a comprehensive mechanistic picture: a metallacyclopropene (η2-vinyl complex) is primarily formed, which either evolves into the E-alkene via a concerted process or reacts to give a half-sandwich ruthenium carbene; in this case, one of the C atoms of the starting alkyne is converted
Batatasin IV is a dihydrostilbenoid isolated from Chinese yams which was shown to have inhibitory activities against plant growth. Later studies showed that this compound may exhibit anti-inflammatory properties by inhibiting the epoxide hydrolase activity of the leukotriene A4 hydrolase enzyme. To access the dihydrostilbenoid skeleton, a copper-free SPhos-mediated Sonogashira reaction was conceived
Hydrazine Hydrate Accelerates Neocuproine–Copper Complex Generation and Utilization in Alkyne Reduction, a Significant Supplement Method for Catalytic Hydrogenation
作者:Yongsheng Zhang、Jincheng Wang、Zhenjiao Yang、Zeng Zhang、Xiaoyan He、Guoliang Chen、Gang Huang、Xiuhong Lu
DOI:10.1021/acs.joc.1c01803
日期:2021.12.17
Diimine (HN═NH) is a strong reducingagent, but the efficiency of diimine oxidized from hydrazine hydrate or its derivatives is still not good enough. Herein, we report an in situ neocuproine–copper complex formation method. The redox potential of this complex enable it can serve as an ideal redox catalyst in the synthesis of diimine by oxidation of hydrazine hydrate, and we successfully applied this
Novel diketopyrrolopyrrole (DPP) based polycatenars characterized with a long π-conjugated rigid calamitic core, different side groups (-Boc, H or PEO) at the lactam N atoms of the central DPP core and terminal hydrophobic paraffinic chains were prepared Sonogashira coupling reaction as key steps. The influence of different side groups, different links and the length of terminal alkyl chains on the
REACTIVE MONOMER AND RESIN COMPOSITION CONTAINING SAME
申请人:Watanabe Hisashi
公开号:US20100059261A1
公开(公告)日:2010-03-11
A material for use in flexible printed wiring board having high reliability and allowing for processing fine wiring includes a compound represented by the following general formula (I):
wherein one of X and Y represents O and the other represents NAr
2
R
2
, and R
1
, R
2
, Ar
1
, and Ar
2
are as defined in the specification, and a resin composition comprising the compound as a reactive monomer.