A5021021262- Radical Photochemical Reactions
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Catalytic C–H Functionalization Methods
- Synthesis and Catalytic Reactions
- Sulfur-Based Synthesis Techniques
- Organoboron and organosilicon chemistry
- Chemical Synthesis and Reactions
- Quantum Dots Synthesis And Properties
- Gold and Silver Nanoparticles Synthesis and Applications
- Fluorine in Organic Chemistry
- Copper Interconnects and Reliability
- Advanced biosensing and bioanalysis techniques
- Electronic Packaging and Soldering Technologies
- Asymmetric Synthesis and Catalysis
- CO2 Reduction Techniques and Catalysts
- Phenothiazines and Benzothiazines Synthesis and Activities
- Photoreceptor and optogenetics research
- Asymmetric Hydrogenation and Catalysis
- Crystallography and molecular interactions
- 3D IC and TSV technologies
- Oxidative Organic Chemistry Reactions
University of Wisconsin–Madison
2017-2024
University of North Carolina Wilmington
2016
Concord University
2015
Stereochemical control of electronically excited states is a long-standing challenge in photochemical synthesis, and few catalytic systems that produce high enantioselectivities triplet-state photoreactions are known. We report herein an exceptionally effective chiral photocatalyst recruits prochiral quinolones using series hydrogen-bonding π–π interactions. The organization these substrates within the environment transition-metal photosensitizer leads to efficient Dexter energy transfer...
Enantioselective catalysis of excited-state photoreactions remains a substantial challenge in synthetic chemistry, and intermolecular have proven especially difficult to conduct stereocontrolled fashion. Herein, we report highly enantioselective [2 + 2] cycloaddition 3-alkoxyquinolones catalyzed by chiral hydrogen-bonding iridium photosensitizer. Enantioselectivities as high 99% ee were measured reactions with range maleimides other electron-deficient alkene reaction partners. An array...
Cyclobutyl moieties in drug molecules are rare, and general, they minimally substituted stereochemically simple. Methods to assemble structurally complex cyclobutane building blocks suitable for rapid diversification thus highly desirable. We report herein a photosensitized [2 + 2] cycloaddition with vinyl boronate esters affording straightforward access complex, densely functionalized scaffolds. Mechanistic studies suggest an activation mode involving energy transfer the styrenyl alkene...
The Paternò–Büchi reaction is the [2 + 2] photocycloaddition of a carbonyl with an alkene to afford oxetane. Enantioselective catalysis this classical photoreaction, however, has proven be long-standing challenge. Many best-developed strategies for asymmetric photochemistry are not suitable address problem because interaction carbonyls Brønsted or Lewis acidic catalysts can alter electronic structure their excited state and divert reactivity toward alternate photoproducts. We show herein...
The Paternò–Büchi reaction is the [2+2] photocycloaddition of a carbonyl with an alkene to afford oxetane products. Enantioselective catalysis this classical photoreaction, however, has proven be long-standing challenge. Many best-developed strategies for asymmetric photochemistry are not suitable address problem because interaction carbonyls Brønsted or Lewis acidic catalysts can alter electronic structure their excited state and divert reactivity towards alternate photoproducts. We show...
Attachment of quantum dots or fluorescent molecules to gold nanoparticles has a variety optical labeling and sensory applications. In this study, we use both e-beam lithography DNA origami examine the fluorescence enhancement with systematic approach understanding contribution nanoparticle size interparticle spacing. The unique design our patterns allows us study effects spacing on in one quick constant conditions – removing undesirable such as differences concentration other chemistry that...
Screen printing for the fabrication of Thick Film microelectronic circuits is now a mature technology. A greater understanding processes and materials used has allowed once ‘black art’ to develop into high precision, yield process today—with containing 250 µm conductors on many levels being printed over large areas up 6 in. × 8 However, electronic systems designers are demanding more compact interconnections screen technology must advance meet this challenge. Encouraging research date...