A5088209425- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Catalytic C–H Functionalization Methods
- Organometallic Complex Synthesis and Catalysis
- Synthetic Organic Chemistry Methods
- Electron and X-Ray Spectroscopy Techniques
- Machine Learning in Materials Science
- CO2 Reduction Techniques and Catalysts
- Synthesis and Catalytic Reactions
- Asymmetric Hydrogenation and Catalysis
- Carbon dioxide utilization in catalysis
- Catalytic Alkyne Reactions
- Electrocatalysts for Energy Conversion
- Field-Flow Fractionation Techniques
- Advanced Electron Microscopy Techniques and Applications
- Electronic and Structural Properties of Oxides
- Sulfur-Based Synthesis Techniques
- Surface Chemistry and Catalysis
- Metal complexes synthesis and properties
- Molecular Junctions and Nanostructures
- Chemical Synthesis and Analysis
- Chemistry and Chemical Engineering
- Various Chemistry Research Topics
- Ionic liquids properties and applications
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
Yale University
2021-2024
University of Minnesota
2016-2021
Twin Cities Orthopedics
2018
Minneapolis Institute of Arts
2018
University of Central Arkansas
2016
Conway School of Landscape Design
2016
Pyrazoles are an important class of heterocycles found in a wide range bioactive compounds and pharmaceuticals. Pyrazole synthesis often requires hydrazine or related reagents where intact N–N bond is conservatively installed into pyrazole precursor fragment. Herein, we report the multicomponent oxidative coupling alkynes, nitriles, Ti imido complexes for multisubstituted pyrazoles. This modular method avoids potentially hazardous like hydrazine, instead forming final step via...
Prior in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) studies of electrochemical CO
Eleven 2,2'-bipyridine (bpy) ligands functionalized with attachment groups for covalent immobilization on silicon surfaces were prepared. Five of the feature silatrane functional to metal oxide coatings surfaces, while six contain either alkene or alkyne hydrogen-terminated surfaces. The bpy coordinated Re(CO)5Cl form complexes type Re(bpy)(CO)3Cl, which are related known catalysts CO2 reduction. Six new characterized using X-ray crystallography. As proof principle, four molecular Re...
Catalytic oxidative nitrene transfer from azides with the early transition metals is rare, and has not been observed without support of redox noninnocent spectator ligands.
Low-valent TiII species have typically been synthesized by the reaction of TiIV halides with strong metal reductants. Herein we report that can be generated simply reacting imido complexes 2 equiv alkyne, yielding a metallacycle reductively eliminate pyrrole while liberating TiII. In order to probe generality this process, TiII-catalyzed alkyne trimerization reactions were carried out diverse range precatalysts.
A series of mono- and bimetallic Ni alkyl complexes a β-oxo-δ-diimine (BODDI) ligand are reported. The monometallic have second binding pocket, which the free "arm" can exist as either an enamine (e.g., 8, BODEI, β-oxo-δ-enamineiminato) or imine 3, BODII, β-oxo-δ-imineiminato) tautomer. identity tautomer in secondary coordination sphere has significant effect on ethylene polymerization behavior: tautomer, hydrogen bonds to central O atom is conjugation with N,O backbone chelate,...
α-Diimines are commonly used as supporting ligands for a variety of transition metal-catalyzed processes, most notably in α-olefin polymerization. They also precursors to valuable synthetic targets, such chiral 1,2-diamines. Their synthesis is usually performed through acid-catalyzed condensation amines with α-diketones. Despite the simplicity this approach, accessing unsymmetrical α-diimines challenging. Herein, we report Ti-mediated intermolecular diimination alkynes afford symmetrical and...
The surface immobilization of molecular catalysts is attractive because it combines the benefits homogeneous and heterogeneous catalysis. However, determining coverage distribution a catalyst on solid support often challenging, inhibiting our ability to design improved catalytic systems. Here, we demonstrate that combination scanning transmission electron microscopy (STEM) image analysis individual positions heavy atoms in transition metal complexes via convolutional neural network (CNN)...
We report a series of isomeric, dicationic Re(bpy
The synthesis and reactivity of a new trimetallic complex Ti(NP)4Ni2 (NP = 2-diphenylphosphinopyrrolide) (3) is reported. Single-crystal X-ray diffraction absorption studies point to unique bonding motif: d10–d10, Ni0–Ni0 bond stabilized by proximal d0 TiIV metal center. coordination chemistry 3 with variety L (L isocyanide alkyne) donors has also been explored. In the case coordination, Ni–Ni broken, while diphenylacetylene binding results in symmetric butterfly μ2-κ2-alkyne bridge across...
Simple Ti amide complexes are shown to act as sources for masked TiII intermediates via several pathways, demonstrated through the investigation of a unique Ti-catalyzed nitrene-coupled transfer hydrogenation 3-hexyne. This reaction proceeds reduction azobenzene by catalyst, wherein both amines and 3-hexyne can serve hydrogen source/reductant forming putative titanaziridines β-H abstraction or titanacyclopentynes protonolysis, respectively.
Boron‐scorpionates are readily prepared by microwave (MW) assisted methods. Such a method is described here, leading to the rapid preparation of heterogeneous resin‐supported scorpionate as its sodium salt, BdPhTpNa [BdPhTp = phenyltris(1‐pyrazolyl)borate covalently bound through phenyl ring commercial cross‐linked polystyrene resin beads]. Formation functional was confirmed from subsequent reactions several metal complexes. This supported ligand system coordinates variety transition ions...
The synthesis of the first terminal Group 9 hydrazido(2-) complex, Cp*IrN(TMP) (6) (TMP=2,2,6,6-tetramethylpiperidine) is reported. Electronic structure and X-ray diffraction analysis indicate that this complex contains an Ir-N triple bond, similar to Bergman's seminal Cp*Ir(N
The surface immobilization of molecular catalysts is attractive because it combines the benefits homogeneous and heterogeneous catalysis. However, determining coverage distribution a catalyst on solid support often challenging, inhibiting our ability to design improved catalytic systems. Here, we demonstrate that combination scanning transmission electron microscopy (STEM) image analysis individual positions heavy atoms in transition metal complexes via convolutional neural network (CNN)...
Abstract The synthesis of the first terminal Group 9 hydrazido(2‐) complex, Cp*IrN(TMP) ( 6 ) (TMP=2,2,6,6‐tetramethylpiperidine) is reported. Electronic structure and X‐ray diffraction analysis indicate that this complex contains an Ir−N triple bond, similar to Bergman's seminal Cp*Ir(N t Bu) imido complex. However, in sharp contrast imido, displays remarkable redox non‐innocent reactivity owing presence N β lone pair. Treatment with MeI results electron transfer from Ir prior oxidative...
The surface immobilization of molecular catalysts is attractive because it combines the benefits homogeneous and heterogeneous catalysis. However, determining coverage distribution a catalyst on solid support often challenging, inhibiting our ability to control catalytic performance. Here, we demonstrate that scanning transmission electron microscopy can image location metal center in surface-attached transition complexes with atomic resolution. Using machine learning model, analyze many...
α-Diimines are commonly used as supporting ligands for a variety of transition metal-catalyzed processes, most notably in α-olefin polymerization. They also precursors to valuable synthetic targets, such chiral 1,2-diamines. Their synthesis is usually performed through acid-catalyzed condensation amines with α-diketones. Despite the simplicity this approach, accessing unsymmetrical α-diimines challenging. Herein, we report Ti-mediated intermolecular diimination alkynes afford symmetrical and...
Abstract The surface immobilization of molecular catalysts is attractive because it combines the benefits homogeneous and heterogeneous catalysis. However, determining coverage distribution a catalyst on solid support often challenging, inhibiting our ability to control catalytic performance. Here, we demonstrate that scanning transmission electron microscopy can image location metal center in surface-attached transition complexes with atomic resolution. Using machine learning model, analyze...