Search

Your search keyword '"Wentz, Kelsie E."' showing total 13 results
Start Over Author "Wentz, Kelsie E."
13 results on '"Wentz, Kelsie E."'

1. Redox- and Charge-State Dependent Trends in 5, 6, and 7-Membered Boron Heterocycles: A Neutral Ligand Coordination Chemistry Approach to Boracyclic Cations, Anions, and Radicals

Author

Hollister, Kimberly K., Wentz, Kelsie E., and Gilliard, Robert J.

Abstract

Boron heterocycles represent an important subset of heteroatom-incorporated rings, attracting attention from organic, inorganic, and materials chemists. The empty pzorbital at the boron center makes them stand out as quintessential Lewis acidic molecules, also serving as a means to modulate electronic structure and photophysical properties in a facile manner. As boracycles are ripe for extensive functionalization, they are used in catalysis, chemical biology, materials science, and continue to be explored as chemical synthons for conjugated materials and reagents. Neutral boron(III)-incorporated polycyclic molecules are some of the most studied types of boracycles, and understanding their redox transformations is important for applications relying on electron transfer and charge transport. While relevant redox species can often be electrochemically observed, it remains challenging to isolate and characterize boracycles where the boron center and/or polycyclic skeleton have been chemically reduced.

Published
2024
Full Text
View/download PDF

4. Synthesis and Ring-Opening Metathesis Polymerization of a Strained trans-Silacycloheptene and Single-Molecule Mechanics of Its Polymer

Author

Wakefield, Herbert, primary, Kevlishvili, Ilia, additional, Wentz, Kelsie E., additional, Yao, Yunxin, additional, Kouznetsova, Tatiana B., additional, Melvin, Sophia J., additional, Ambrosius, Em G., additional, Herzog-Arbeitman, Abraham, additional, Siegler, Maxime A., additional, Johnson, Jeremiah A., additional, Craig, Stephen L., additional, Kulik, Heather J., additional, and Klausen, Rebekka S., additional

Published
2023
Full Text
View/download PDF

8. Isolation of Stable Borepin Radicals and Anions

Author

Hollister, Kimberly K., primary, Yang, Wenlong, additional, Mondol, Ranajit, additional, Wentz, Kelsie E., additional, Molino, Andrew, additional, Kaur, Aishvaryadeep, additional, Dickie, Diane A., additional, Frenking, Gernot, additional, Pan, Sudip, additional, Wilson, David J. D., additional, and Gilliard, Robert J., additional

Published
2022
Full Text
View/download PDF

10. Approaching Dianionic Tetraoxadiborecine Macrocycles: 10‐Membered Bora‐Crown Ethers Incorporating Borafluorenate Units.

Author

Wentz, Kelsie E., Molino, Andrew, Freeman, Lucas A., Dickie, Diane A., Wilson, David J. D., and Gilliard, Robert J.

Subjects
*ALKALI metals, *X-ray crystallography, *NUCLEAR magnetic resonance spectroscopy, *ELEMENTAL analysis, *ELECTRONIC structure, *BORON isotopes
Abstract

The addition of non‐benzenoid quinones, acenapthenequinone or aceanthrenequinone, to the 9‐carbene‐9‐borafluorene monoanion (1) affords the first examples of dianionic 10‐membered bora‐crown ethers (2–5), which are characterized by multi‐nuclear NMR spectroscopy (1H, 13C, 11B), X‐ray crystallography, elemental analysis, and UV/Vis spectroscopy. These tetraoxadiborecines have distinct absorption profiles based on the positioning of the alkali metal cations. When compound 4, which has a vacant C4B2O4 cavity, is reacted with sodium tetrakis[3,5‐bis(trifluoromethyl)phenyl]borate, a color change from purple to orange serves as a visual indicator of metal binding to the central ring, whereby the Na+ ion coordinates to four oxygen atoms. A detailed theoretical analysis of the calculated reaction energetics is provided to gain insight into the reaction mechanism for the formation of 2–5. These data, and the electronic structures of proposed intermediates, indicate that the reaction proceeds via a boron enolate intermediate. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

13. Isolation of Stable Borepin Radicals and Anions.

Author

Hollister KK, Yang W, Mondol R, Wentz KE, Molino A, Kaur A, Dickie DA, Frenking G, Pan S, Wilson DJD, and Gilliard RJ Jr

Abstract

Borepin, a 7-membered boron-containing heterocycle, has become an emerging molecular platform for the development of new materials and optoelectronics. While electron-deficient borepins are well-established, reduced electron-rich species have remained elusive. Herein we report the first isolable, crystalline borepin radical (2 a, 2 b) and anion (3 a, 3 b) complexes, which have been synthesized by potassium graphite (KC 8 ) reduction of cyclic(alkyl)(amino) carbene-dibenzo[b,d]borepin precursors. Borepin radicals and anions have been characterized by EPR or NMR, elemental analysis, X-ray crystallography, and cyclic voltammetry. In addition, the bonding features have been investigated computationally using density functional theory., (© 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results