A polypropylene resin composition comprising (A) a crystalline propylene block copolymer having a content of a room temperature n-decane-soluble portion of 15 to 35% by weight and having MFR of 5 to 80 g/10min, in an amount of 94 to 55%, (B) an elastomeric polymer in an amount of 1 to 20% by weight and (C) an inorganic filler in an amount of 5 to 25% by weight, said composition having the property that a ratio of an Izod impact strength (J/m, IZ250-30) of a specimen obtained by maintaining the composition at 250°C for 30 minutes in a molten state in an injection molding machine and then molding the composition, said Izod impact strength being measured after 48 hours from the molding, to an Izod impact strength (J/m, IZ230-3) of a specimen obtained by maintaining the composition at 230°C for 3 minutes in a molten state in the same injection molding machine and then molding the composition by the same method, said Izod impact strength being measured after 48 hours from the molding, satisfies the following formula: 1.0≥(IZ250−30/IZ230−3)≥0.5.
dihydrogen and hydride transfer accomplish the hydrogenation of heteroarenesunder homogeneous conditions. In contrast, carbocyclic aryl motifs are hydrogenated via a heterogeneous pathway, by in situ generated ruthenium nanoparticles. Remarkably, these hydrogenation reactions can be performed using molecular hydrogen under solvent-free conditions or with 1,4-dioxane, and thus give access to a broad range
一个简单的双核monohydrido桥接钌络合物[(η 6 - p -cymene)的RuCl} 2(μ-H-μ-Cl)的]充当各种杂芳烃和芳烃的氢化的有效的和选择性的催化剂。使用包括原位反应监测,动力学研究,定量中毒实验和电子显微镜在内的多种技术组合研究了催化活性物质的性质,证明了双重反应性。结果表明杂芳烃的氢化通过分子催化进行。特别地,监测通过NMR光谱反应进展表明,[(η 6 - p -cymene)的RuCl} 2(μ-H–μ-Cl)]转化为单体钌中间体,随后通过二氢活化和氢化物转移,在均相条件下完成了杂芳烃的氢化反应。相反,碳环芳基基序通过异质途径被原位生成的钌纳米粒子氢化。值得注意的是,这些氢化反应可以在无溶剂条件下使用分子氢或与1,4-二恶烷进行,因此可以在不产生废物的情况下接触到广泛的饱和杂环和碳环化合物。
Synthesis of Saturated N‐Heterocycles via a Catalytic Hydrogenation Cascade
SaturatedN-heterocycles are prominent motifs found in various natural products and pharmaceuticals. Despite the increasing interest in this class of compounds, the synthesis of saturated bicyclic azacycles requires tedious multi-step syntheses. Herein, we present a one-pot protocol for the synthesis of octahydroindoles, decahydroquinolines, and octahydroindolizines through a cascade reaction.