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Lachguar A, Bandyopadhyay U, Ech-Chariy M, Vincendeau S, Audin C, Daran JC, Manoury E, Poli R, Deydier E. New Protocol for the Synthesis of S-Thioesters from Benzylic, Allylic and Tertiary Alcohols with Thioacetic Acid. Chemistry 2024; 30:e202302551. [PMID: 37823749 DOI: 10.1002/chem.202302551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 10/11/2023] [Accepted: 10/12/2023] [Indexed: 10/13/2023]
Abstract
A new one-pot solvent-less reaction to convert benzylic, allylic, ferrocenyl or tertiary alcohols into S-thioesters, bench-stable and less odorous precursors of the corresponding thiols, which is based on reactions in neat thioacetic acid in the presence of tetrafluoroboric acid, is presented. Reaction monitoring by NMR and GC of the benzyl alcohol conversion indicated the intermediate formation of benzyl acetate and benzyl thionoacetate (PhCH2 OC(S)CH3 ) prior to the slower conversion to the final S-benzyl thioacetate product. Increasing the HBF4 concentration enhanced the reaction rate, giving good to excellent yield (up to 99 %) for a large scope of alcohols. Control experiments, with support of DFT calculations, have revealed a thermodynamically favorable, though requiring HBF4 -activation, disproportionation of CH3 C(O)SH to CH3 C(O)OH and CH3 C(S)SH, the latter immediately decomposing to H2 S and (MeC)4 S6 but also generating the hitherto unreported [MeC(O)C(Me)S]2 (μ-S)2 . Kinetic investigations demonstrated that the rate of benzyl alcohol conversion is second-order in [PhCH2 OH] and second order in [HBF4 ], while the rate of conversion of the benzyl acetate intermediate to S-benzyl thioacetate is second order in [PhCOOMe] and fourth order in [HBF4 ]. The DFT calculations rationalize the need to two alcohol molecules and two protons to generate the reactive benzyl cation.
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Affiliation(s)
- Abdelhak Lachguar
- LCC-CNRS, Université de Toulouse, UPS, INPT, 205 Route de Narbonne, 31077, Toulouse, Cedex 4, France
- IUT A Paul Sabatier, Dpt. De Chimie, Ave. G. Pompidou, 81104, Castres Cedex, France
| | - Uchchhal Bandyopadhyay
- LCC-CNRS, Université de Toulouse, UPS, INPT, 205 Route de Narbonne, 31077, Toulouse, Cedex 4, France
| | - Mehdi Ech-Chariy
- LCC-CNRS, Université de Toulouse, UPS, INPT, 205 Route de Narbonne, 31077, Toulouse, Cedex 4, France
- IUT A Paul Sabatier, Dpt. De Chimie, Ave. G. Pompidou, 81104, Castres Cedex, France
| | - Sandrine Vincendeau
- LCC-CNRS, Université de Toulouse, UPS, INPT, 205 Route de Narbonne, 31077, Toulouse, Cedex 4, France
| | - Catherine Audin
- LCC-CNRS, Université de Toulouse, UPS, INPT, 205 Route de Narbonne, 31077, Toulouse, Cedex 4, France
- IUT A Paul Sabatier, Dpt. De Chimie, Ave. G. Pompidou, 81104, Castres Cedex, France
| | - Jean-Claude Daran
- LCC-CNRS, Université de Toulouse, UPS, INPT, 205 Route de Narbonne, 31077, Toulouse, Cedex 4, France
| | - Eric Manoury
- LCC-CNRS, Université de Toulouse, UPS, INPT, 205 Route de Narbonne, 31077, Toulouse, Cedex 4, France
| | - Rinaldo Poli
- LCC-CNRS, Université de Toulouse, UPS, INPT, 205 Route de Narbonne, 31077, Toulouse, Cedex 4, France
- Institut Universitaire de France, 1, rue Descartes, 75231, Paris, France
| | - Eric Deydier
- LCC-CNRS, Université de Toulouse, UPS, INPT, 205 Route de Narbonne, 31077, Toulouse, Cedex 4, France
- IUT A Paul Sabatier, Dpt. De Chimie, Ave. G. Pompidou, 81104, Castres Cedex, France
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Yamada K, Masuda Y. A sulfur-33 nuclear quadrupole resonance study of 33 S 2 -labeled L-cystine. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2023; 61:296-300. [PMID: 36650107 DOI: 10.1002/mrc.5333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/11/2023] [Accepted: 01/14/2023] [Indexed: 06/17/2023]
Abstract
The sulfur electric-field-gradient tensor for a disulfide bond in 33 S2 -labeled L-cystine has been investigated by 33 S nuclear quadrupole resonance (NQR). 33 S2 -labeled L-cystine is synthesized by introduction of disulfide ions prepared from elemental 33 S-sulfur into an amino acid derivative, the side chain of which is iodinated. In its NQR spectrum, sharp single peaks are observed at between 24.63 and 24.90 MHz in the temperature range from 80 to 298 K. The two-dimensional nutation echo 33 S NQR experiment is carried out at 160 K, and the quadrupole coupling constant, CQ , and the asymmetric parameter, ηQ , are obtained to be 46.9(9) MHz and 0.6(1), respectively. The calculated 33 S electric-field-gradient tensor components with respect to the molecular frame is briefly discussed.
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Affiliation(s)
- Kazuhiko Yamada
- Interdisciplinary Science Unit, Multidisciplinary Sciences Cluster, Research and Education Faculty, Kochi University, Kochi, Japan
| | - Yuichi Masuda
- Graduate School of Bioresources, Mie University, Tsu, Japan
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
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Sergentu DC, Gendron F, Walter ED, Park S, Capan C, Surbella RG, Soderquist CZ, Hall GB, Sinkov SI, Autschbach J, Cho H. Equatorial Electronic Structure in the Uranyl Ion: Cs 2UO 2Cl 4 and Cs 2UO 2Br 4. Inorg Chem 2021; 61:3821-3831. [PMID: 34817159 DOI: 10.1021/acs.inorgchem.1c02832] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electric field gradient (EFG) tensors in the equatorial plane of the linear UO22+ ion have been measured by nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) experiments and computed by relativistic Kohn-Sham methods with and without environment embedding for Cs2UO2Cl4 and Cs2UO2Br4. This approach expands the possibilities for probing the electronic structure in uranyl complexes beyond the strongly covalent U-O bonds. The combined analyses find that one of the two largest principal EFG tensor components at the halogen sites points along the U-X bond (X = Cl, Br), and the second is parallel to the UO22+ ion; in Cs2UO2Cl4, the components are nearly equal in magnitude, whereas in Cs2UO2Br4, due to short-range bromide-cesium interactions, the equatorial component is dominant for one pair of Br sites and the axial component is larger for the second pair. The directions and relative magnitudes of the field gradient principal axes are found to be sensitive to the σ and π electron donation by the ligands and the model of the environment. Chlorine-35 NQR spectra of 235U-depleted and 235U-enriched Cs2UO2Cl4 exhibited no uranium-isotope-dependent shift, but the resonance of the depleted sample displayed a 58% broader line width.
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Affiliation(s)
- Dumitru-Claudiu Sergentu
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, United States
| | - Frédéric Gendron
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, United States
| | - Eric D Walter
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Sejun Park
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Cigdem Capan
- Washington State University, Richland, Washington 99354, United States
| | - R Gian Surbella
- National Security Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Chuck Z Soderquist
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Gabriel B Hall
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Sergey I Sinkov
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, United States
| | - Herman Cho
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
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