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Your search keyword '"Caleb N. Jadrich"' showing total 4 results
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4 results on '"Caleb N. Jadrich"'

1. A Cation-Dependent Dual Activation Motif for Anionic Ring-Opening Polymerization of Cyclic Esters

Author

Caleb N. Jadrich, Vince E. Pane, Binhong Lin, Gavin O. Jones, James L. Hedrick, Nathaniel H. Park, and Robert M. Waymouth

Subjects
Anions, Lactones, Colloid and Surface Chemistry, Cations, Esters, General Chemistry, Biochemistry, Catalysis, Polymerization
Abstract

A new organocatalyst for the ring-opening polymerization of lactones has been identified. Under the tested conditions, the anions of 2,2'-bisindole promote fast, living polymerizations (as short as 10 ms) which are selective for chain elongation over transesterification (Đ ≤ 1.1). While structurally related to (thio)urea anion catalysts, anions of 2,2'-bisindole activate the monomer via the counterion rather than through hydrogen bonding. This new activation motif enables modulation of the polymerization rate by 2 orders of magnitude by changing the counterion.

Published
2022

2. Ultrafast and Controlled Ring-Opening Polymerization with Sterically Hindered Strong Bases

Author

Vince E. Pane, Charles Dausse, Nathaniel H. Park, Caleb N. Jadrich, Tim Erdmann, Robert M. Waymouth, Binhong Lin, Pedro L. Arrechea, and James L. Hedrick

Subjects
Inorganic Chemistry, Steric effects, Polymers and Plastics, Polymerization, Chemistry, Organic Chemistry, Polymer chemistry, technology, industry, and agriculture, Materials Chemistry, macromolecular substances, Ring-opening polymerization
Abstract

The controlled anionic ring-opening polymerization of lactones and siloxanes is carried out in continuous-flow reactors. Anionic ring-opening polymerization of cyclic esters with strong, soluble ba...

Published
2020

3. Thermodynamic Hydricity across Solvents: Subtle Electronic Effects and Striking Ligation Effects in Iridium Hydrides

Author

Alexander J. M. Miller, Caleb N. Jadrich, Kelsey R. Brereton, and Bethany M. Stratakes

Subjects
010405 organic chemistry, Hydride, Organic Chemistry, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Inorganic Chemistry, Solvent, Crystallography, chemistry, Electronic effect, Iridium, Physical and Theoretical Chemistry
Abstract

Insights into the influence of solvent on hydride transfer emerge from a study of iridium complexes with the formula [Cp*Ir(bpy-X)H]+ (bpy-X = 4,4′-X2-2,2′-bipyridine, X = H, Me, tBu, OMe, CO2Me, a...

Published
2019

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