Journal ArticleDOI
NMR Chemical Shifts of Common Laboratory Solvents as Trace Impurities.
TLDR
1H and 13C chemical shifts of what are, in the authors' experience, the most popular “extra peaks” in a variety of commonly used NMR solvents are collected, in the hope that this will be of assistance to the practicing chemist.Abstract:
In the course of the routine use of NMR as an aid for organic chemistry, a day-to-day problem is the identification of signals deriving from common contaminants (water, solvents, stabilizers, oils) in less-than-analytically-pure samples. This data may be available in the literature, but the time involved in searching for it may be considerable. Another issue is the concentration dependence of chemical shifts (especially 1H); results obtained two or three decades ago usually refer to much more concentrated samples, and run at lower magnetic fields, than today’s practice. We therefore decided to collect 1H and 13C chemical shifts of what are, in our experience, the most popular “extra peaks” in a variety of commonly used NMR solvents, in the hope that this will be of assistance to the practicing chemist.read more
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Journal ArticleDOI
NMR Chemical Shifts of Trace Impurities: Common Laboratory Solvents, Organics, and Gases in Deuterated Solvents Relevant to the Organometallic Chemist
Gregory R. Fulmer,Alexander J. M. Miller,Nathaniel H. Sherden,Hugo E. Gottlieb,Abraham Nudelman,Brian M. Stoltz,John E. Bercaw,Karen I. Goldberg +7 more
TL;DR: Tables of 1H and 13C NMR chemical shifts have been compiled for common organic compounds often used as reagents or found as products or contaminants in deuterated organic solvents as discussed by the authors.
Journal ArticleDOI
Highly practical copper(I)/TEMPO catalyst system for chemoselective aerobic oxidation of primary alcohols.
TL;DR: A new (bpy)Cu(I)/TEMPO catalyst system that enables efficient and selective aerobic oxidation of a broad range of primary alcohols to the corresponding aldehydes using readily available reagents, at room temperature with ambient air as the oxidant.
Journal ArticleDOI
Mechanism of copper(I)/TEMPO-catalyzed aerobic alcohol oxidation.
TL;DR: A mechanistic investigation of the (bpy)Cu(I)/TEMPO/NMI catalyst system is presented, in which the reactivity of benzylic and aliphatic alcohols are compared andCatalytic rate laws, kinetic isotope effects, and spectroscopic data show that reactions of benzymes have different turnover-limiting steps.
Journal ArticleDOI
Thermal stability of low temperature ionic liquids revisited
TL;DR: In this paper, the authors showed that 1-butyl-3-methylimidazolium triflate was stable at 200°C and showed good wettability against aluminum oxide and silver at elevated temperatures.
Journal ArticleDOI
Boosting Zinc Electrode Reversibility in Aqueous Electrolytes by Using Low-Cost Antisolvents
TL;DR: In this paper, a similar antisolvent strategy was proposed to boost Zn reversibility via regulation of the electrolyte on a molecular level. But this strategy is not applicable to other solvents, indicating its practical universality.