Further Conventions for NMR Shielding and Chemical Shifts (IUPAC Recommendations 2008)Copyright IUPAC (2008). Reprinted with permission from Pure Appl. Chem., 2008, 80, 59-84, which can be freely downloaded from www.iupac.org/publications/pac/80/1/0059, provided IUPAC copyright is acknowledged in any use. Membership of the relevant IUPAC Committee is listed therein.

Harris, Robin K.; Becker, Edwin D.; Menezes, Sônia Maria Cabral de; Granger, Pierre; Hoffman, Ralph E.; Zilm, Kurt W.

doi:10.1002/9780470034590.emrstm1019

Cited by 4 publications

(1 citation statement)

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“…1 H and 13 C{ 1 H} NMR spectra are referenced to external SiMe 4 using the residual protio solvent peaks as internal standards ( 1 H NMR experiments) or the characteristic resonances of the solvent nuclei ( 13 C NMR experiments). 7 Li{ 1 H} NMR spectra were referenced indirectly with the 1 H resonance of SiMe 4 at 0 ppm, according to IUPAC standard. , IR spectra were recorded on a Mattson Genesis FTIR spectrometer. Elemental analyses were performed by the Microanalytical Laboratory at UC Berkeley.…”

Section: Methodsmentioning

confidence: 99%

Uranyl Coordination by the 14-Membered Macrocycle Dibenzotetramethyltetraaza[14]annulene

et al. 2017

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Reaction of [UO(N(SiMe))(THF)] with 1 equiv of dibenzotetramethyltetraaza[14]annulene (tmtaaH) affords the uranyl complex [UO(tmtaaH)(N(SiMe)) (THF)] (1) (THF = tetrahydrofuran) as red blocks in 83% yield. Similarly, thermolysis of a mixture of [UO(N(SiMe))(THF)] and 2 equiv of tmtaaH affords [UO(tmtaaH)] (2), which can be isolated as red-orange crystals in 67% yield after workup. Both 1 and 2 were fully characterized, including analysis by X-ray crystallography. The tmtaaH ligands in 1 and 2 are only coordinated to the uranium center via one β-diketiminate fragment, while the protonated β-diketimine portion of the ligand remains uncoordinated. Reaction of [UO(N(SiMe))(THF)] with 1 equiv of Li(tmtaa) in CH results in the formation of [Li(THF)][UO(N(SiMe))(tmtaa)] (3), which can be isolated in 55% yield as a red-brown crystalline solid. The tmtaa ligand in complex 3 supports a dative interaction between an oxo ligand in the uranyl fragment and a lithium cation, suggesting that tmtaa could be a useful ligand for developing the oxo ligand functionalization chemistry of the uranyl ion.

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Section: Methodsmentioning

confidence: 99%

Uranyl Coordination by the 14-Membered Macrocycle Dibenzotetramethyltetraaza[14]annulene

et al. 2017

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Zerovalent Nickel Compounds Supported by 1,2-Bis(diphenylphosphino)benzene: Synthesis, Structures, and Catalytic Properties

2017

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Zerovalent nickel compounds which feature 1,2-bis(diphenylphosphino)benzene (dppbz) were obtained via the reactivity of dppbz towards Ni(PMe), which affords sequentially (dppbz)Ni(PMe) and Ni(dppbz). Furthermore, the carbonyl derivatives (dppbz)Ni(PMe)(CO) and (dppbz)Ni(CO) may be obtained via the reaction of CO with (dppbz)Ni(PMe). Other methods for the synthesis of these carbonyl compounds include (i) the formation of (dppbz)Ni(CO) by the reaction of Ni(PPh)(CO) with dppbz and (ii) the formation of (dppbz)Ni(PMe)(CO) by the reaction of (dppbz)Ni(CO) with PMe. Comparison of the ν(CO) IR spectroscopic data for (dppbz)Ni(CO) with other (diphosphine)Ni(CO) compounds provides a means to evaluate the electronic nature of dppbz. Specifically, comparison with (dppe)Ni(CO) indicates that the o-phenylene linker creates a slightly less electron donating ligand than does an ethylene linker. The steric impact of the dppbz ligand in relation to other diphosphine ligands has also been evaluated in terms of its buried volume (%V) and steric maps. The nickel center of (dppbz)Ni(PMe) may be protonated by formic acid at room temperature to afford [(dppbz)Ni(PMe)H], but at elevated temperatures, effects catalytic release of H from formic acid. Analogous studies with Ni(dppbz) and Ni(PMe) indicate that the ability to protonate the nickel centers in these compounds increases in the sequence Ni(dppbz) < (dppbz)Ni(PMe) < Ni(PMe); correspondingly, the pK values of the protonated derivatives increase in the sequence [Ni(dppbz)H] < [(dppbz)Ni(PMe)H] < [Ni(PMe)H]. (dppbz)Ni(PMe) and Ni(PMe) also serve as catalysts for the formation of alkoxysilanes by (i) hydrosilylation of PhCHO by PhSiH and PhSiH and (ii) dehydrocoupling of PhCHOH with PhSiH and PhSiH.

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Conformations in Solution and in Solid-State Polymorphs: Correlating Experimental and Calculated Nuclear Magnetic Resonance Chemical Shifts for Tolfenamic Acid

et al. 2020

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Cited by 4 publications

References 30 publications

Uranyl Coordination by the 14-Membered Macrocycle Dibenzotetramethyltetraaza[14]annulene

Uranyl Coordination by the 14-Membered Macrocycle Dibenzotetramethyltetraaza[14]annulene

Zerovalent Nickel Compounds Supported by 1,2-Bis(diphenylphosphino)benzene: Synthesis, Structures, and Catalytic Properties

Conformations in Solution and in Solid-State Polymorphs: Correlating Experimental and Calculated Nuclear Magnetic Resonance Chemical Shifts for Tolfenamic Acid

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