다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Due to the high electron charge, large ion radius, and plentiful outer hybrid orbitals of LnIII cations, microporous Ln-MOFs can be used as Lewis acidic catalysts with high catalytic activity for a...

Highly Robust {Ln4}-Organic Frameworks (Ln = Ho, Yb) for Excellent Catalytic Performance on Cycloaddition Reaction of Epoxides with CO2 and Knoevenagel Condensation

Facile preparation of N-doped porous carbon from chitosan and NaNH2 for CO2 adsorption and conversion

Stable metal-organic frameworks containing periodically arranged nanosized pores and active Lewis acid-base active sites are considered as ideal candidates for efficient heterogeneous catalysis. Herein, the exquisite combination of [Y2(CO2)7(H2O)2] cluster (abbreviated as {Y2}) and multifunctional linker of 2,4,6-tri(2,4-dicarboxyphenyl)pyridine (H6TDP) led to a nanoporous framework of {[Y2(TDP)(H2O)2]·5H2O·4DMF}n (NUC-53, NUC = North University of China), which is a rarely reported binuclear three-dimensional (3D) framework with hierarchical tetragonal-microporous (0.78 nm) and octagonal-nanoporous (1.75 nm) channels. The inner walls of these channels are aligned by {Y2} clusters and plentifully coexisted Lewis acid-base sites of YIII ions and Npyridine atoms. Furthermore, NUC-53 has a quite large void volume of ∼65.2%, which is significantly higher than most documented 3D rare-earth-based MOFs. The performed catalytic experiments exhibited that activated NUC-53 showed a high catalytic activity on the cycloaddition reactions of CO2 with styrene oxide under mild conditions with excellent turnover number (TON: 1980) and turnover frequency (TOF: 495 h-1). Moreover, the deacetalization-Knoevenagel condensation reactions of benzaldehyde dimethyl acetal and malononitrile could be efficiently prompted by the heterogeneous catalyst of NUC-53. These findings not only pave the way for the construction of nanoporous MOF based on rare-earth clusters with a variety of catalytic activities but also provide some new insights into the catalytic mechanism.

Nanoporous {Y2}-Organic Frameworks for Excellent Catalytic Performance on the Cycloaddition Reaction of Epoxides with CO2 and Deacetalization-Knoevenagel Condensation.

Highly efficient CO2 fixation into cyclic carbonate by hydroxyl-functionalized protic ionic liquids at atmospheric pressure

Catalyst-free selective N-formylation and N-methylation of amines using CO2 as a sustainable C1 source

Deep Eutectic Solvents as Efficient Catalysts for Fixation of CO2 to Cyclic Carbonates at Ambient Temperature and Pressure through Synergetic Catalysis

Reductive amination of ketones/aldehydes with amines using BH3N(C2H5)3 as a reductant.

We describe herein an efficient and catalyst-free methodology for N-formylation and N-methylation of various amines using BH3N(C2H5)3 as a reductant and CO2 as C1 source. This system is compatible with a wide range of substrates, such as aromatic secondary amines, aliphatic secondary amines, heterocyclic amines, and primary amines. The desired methylamines and formamides are obtained in excellent yields by changing the reaction solvent, temperature, and the amount of BH3N(C2H5)3. The optimum yields of methylamines and formamides are up to 99 %, which are comparable to the data using different catalysts. Moreover, it has been demonstrated by mechanistic research that CO2 was activated by inserting into B–H bonds of BH3N(C2H5)3 and formamide can be regarded as an intermediate species during the N-methylation formation.

Qizhuang Zou

Papers

Catalyst-free selective N-formylation and N-methylation of amines using CO2 as a sustainable C1 source

Deep Eutectic Solvents as Efficient Catalysts for Fixation of CO2 to Cyclic Carbonates at Ambient Temperature and Pressure through Synergetic Catalysis

Reductive amination of ketones/aldehydes with amines using BH3N(C2H5)3 as a reductant.

Catalyst-free hierarchical reduction of CO2 with BH3N(C2H5)3 for selective N-methylation and N-formylation of amines

Synthesis of Mesoporous PdxCu1–x/Al2O3-y Bimetallic Catalysts Via Mechanochemistry for Selective N-Formylation of Amines with CO2 and H2