NNC-Scorpionate Zirconium-Based Bicomponent Systems for the Efficient CO<sub>2</sub> Fixation into a Variety of Cyclic Carbonates
作者:Juan Fernández-Baeza、Luis F. Sánchez-Barba、Agustín Lara-Sánchez、Sonia Sobrino、Jaime Martínez-Ferrer、Andrés Garcés、Marta Navarro、Ana M. Rodríguez
DOI:10.1021/acs.inorgchem.0c01532
日期:2020.9.8
derivatives of the bis(3,5-dimethylpyrazol-1-yl)methane modified by introduction of organosilyl groups on the central carbon atom, one of which bearing a chiral fragment, have been easily prepared. We verified the potential utility of these compounds through the reaction with [Zr(NMe2)4] for the preparation of novel zirconium complexes in which an ancillary bis(pyrazol-1-yl)methanide acts as a robust
Bimetallic scorpionate-based helical organoaluminum complexes for efficient carbon dioxide fixation into a variety of cyclic carbonates
作者:Marta Navarro、Luis F. Sánchez-Barba、Andrés Garcés、Juan Fernández-Baeza、Israel Fernández、Agustín Lara-Sánchez、Ana M. Rodríguez
DOI:10.1039/d0cy00593b
日期:——
preferential arrangement of the ancillary scorpionates in the bimetallic complexes and rationalized the proposed reaction mechanism. Bimetallic complexes were investigated as catalysts in combination with halides for the cycloaddition reaction of CO2 with a wide range of epoxides for cyclic carbonate formation. These studies led to the development of a sustainable, inexpensive, efficient and selective bicomponent
可以通过加热初步的双核加合物或通过直接加热2当量的配体配体来获得新的双金属螺旋铝配合物。的AlR 3。X射线衍射分析证实了配体中的高配位通用性和配合物中存在螺旋手性。DFT计算证实了双金属配合物中辅助蝎子的优先排列,并合理化了所提出的反应机理。研究了双金属配合物作为催化剂与卤化物结合用于CO 2的环加成反应与多种环氧化物形成环状碳酸酯。这些研究导致了可持续,廉价,高效和选择性的双组分系统的开发,该系统具有非常广泛的底物范围,包括内部的和具有挑战性的生物基三取代萜烯衍生的底物,在温和条件下可实现高反式环氧丙烷的转化率(79%转化温度为70°C,10 bar CO 2,1 mol%,66 h)
An Efficient and Versatile Lanthanum Heteroscorpionate Catalyst for Carbon Dioxide Fixation into Cyclic Carbonates
作者:Javier Martínez、Juan Fernández-Baeza、Luis F. Sánchez-Barba、José A. Castro-Osma、Agustín Lara-Sánchez、Antonio Otero
DOI:10.1002/cssc.201700898
日期:2017.7.21
heteroscorpionate complex has shown exceptional catalytic activity for the synthesis of cycliccarbonatesfrom epoxides and carbondioxide. This catalyst system also promotes the reaction of bio‐based epoxides to give an important class of bis(cycliccarbonates) that can be further used for the production of bio‐derived non‐isocyanate polyurethanes. The catalytic process requires low catalyst loading and
Polyether, active-hydrogen ingredient , resin-forming composition, and process for producing foam
申请人:——
公开号:US20030100623A1
公开(公告)日:2003-05-29
The present invention relates to polyether compounds, active hydrogen compounds and resin-forming compositions composed of the polyols, and methods for producing foams by employing the active hydrogen components. These polyether compounds have a decreased number of moles of added EO thereby maintaining the hydrophobicity and have sufficient reactivity as polyol components of resins, thereby having high reaction rates. Therefore, it is possible to provide resins having excellent resin properties (tensile strength, flexural strength, water-absorption swelling ratio, etc.).
A resin particle having a sufficiently narrow particle size distribution obtainable by using a supercritical fluid, and a production method for obtaining a resin particle having a sufficiently narrow particle size distribution by using a supercritical fluid are provided. The present invention provides a resin particle (C) having a microparticle (A) fixed to or formed as a film on a surface of a resin particle (B) containing a resin (b), wherein the degree of swelling of the microparticle (A) by liquid or supercritical carbon dioxide (X) at a temperature lower than the glass transition temperature or the melting point of the microparticle (A) is 16% or less, and the microparticle (A) is at least one kind selected from the group consisting of a crystalline resin (a1), a noncrystalline resin (a2), and an inorganic compound (a3).