10591-85-2Relevant articles and documents
Photocatalytic H2-Evolution by Homogeneous Molybdenum Sulfide Clusters Supported by Dithiocarbamate Ligands
Fontenot, Patricia R.,Shan, Bing,Wang, Bo,Simpson, Spenser,Ragunathan, Gayathri,Greene, Angelique F.,Obanda, Antony,Hunt, Leigh Anna,Hammer, Nathan I.,Webster, Charles Edwin,Mague, Joel T.,Schmehl, Russell H.,Donahue, James P.
, p. 16458 - 16474 (2019)
Irradiation at 460 nm of [Mo3(μ3-S)(μ2-S2)3(S2CNR2)3]I ([2a]I, R = Me; [2b]I, R = Et; [2c]I, R = iBu; [2d]I, R = CH2C6H5) in a mixed aqueous-polar organic medium with [Ru(bipy)3]2+ as photosensitizer and Et3N as electron donor leads to H2 evolution. Maximum activity (300 turnovers, 3 h) is found with R = iBu in 1:9 H2O:MeCN; diminished activity is attributed to deterioration of [Ru(bipy)3]2+. Monitoring of the photolysis mixture by mass spectrometry suggests transformation of [Mo3(μ3-S)(μ2-S2)3(S2CNR2)3]+ to [Mo3(μ3-S)(μ2-S)3(S2CNR2)3]+ via extrusion of sulfur on a time scale of minutes without accumulation of the intermediate [Mo3S6(S2CNR2)3]+ or [Mo3S5(S2CNR2)3]+ species. Deliberate preparation of [Mo3S4(S2CNEt2)3]+ ([3]+) and treatment with Et2NCS21- yields [Mo3S4(S2CNEt2)4] (4), where the fourth dithiocarbamate ligand bridges one edge of the Mo3 triangle. Photolysis of 4 leads to H2 evolution but at ~25% the level observed for [Mo3S7(S2CNEt2)3]+. Early time monitoring of the photolyses shows that [Mo3S4(S2CNEt2)4] evolves H2 immediately and at constant rate, while [Mo3S7(S2CNEt2)3]+ shows a distinctive incubation prior to a more rapid H2 evolution rate. This observation implies the operation of catalysts of different identity in the two cases. Photolysis solutions of [Mo3S7(S2CNiBu2)3]+ left undisturbed over 24 h deposit the asymmetric Mo6 cluster [(iBu2NCS2)3(μ2-S2)2(μ3-S)Mo3](μ3-S)(μ3-η2,η1-S′,η1-S″-S2)[Mo3(μ2-S)3(μ3-S)(S2CNiBu2)2(μ2-S2CNiBu2)] in crystalline form, suggesting that species with this hexametallic composition and core topology are the probable H2-evolving catalysts in photolyses beginning with [Mo3S7(S2CNR2)3]+. When used as solvent, N,N-dimethylformamide (DMF) suppresses H2-evolution but to a greater degree for [Mo3S4(S2CNEt2)4] than for [Mo3S7(S2CNEt2)3]+. Recrystallization of [Mo3S4(S2CNEt2)4] from DMF affords [Mo3S4(S2CNEt2)4(η1,κO-DMF)] (5), implying that inhibition by DMF arises from competition for a Mo coordination site that is requisite for H2 evolution. Computational assessment of [Mo3S4(S2CNMe2)3]+ following addition of 2H+ and 2e- suggests a Mo(H)-μ2(SH) intermediate as the lowest energy species for H2 elimination. An analogous pathway may be available to the Mo6 cluster via dissociation of one end of the μ2-S2CNR2 ligand, a known hemilabile ligand type, in the [Mo3S4]4+ fragment.
Method for preparing tetrabenzyl thiuram disulfide
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Paragraph 0008; 0023-0026; 0027-0031; 0032-0045, (2021/11/21)
The invention belongs to the technical field of rubber auxiliary production, and relates to a method for preparing a disulphide tetrabenzyl thiuram disulfide. The method comprises the following steps: sequentially adding water, an aqueous sodium hydroxide solution and dibenzylamine in a reactor, adding a dispersing agent, and then dropwise adding carbon disulfide to perform condensation reaction to obtain the dibenzyldithioformate solution. The sodium dibenzyldithioformate solution is subjected to oxidation reaction and then filtered and dried to obtain a thiurylthiuram disulfide. In the condensation reaction process, the dispersing agent is added, the reaction system forms a uniform state, the reaction process is carried out in a uniform system, two-phase reaction is avoided when carbon disulfide is added dropwise in the prior art, and the reaction effect is poor. COD In the waste water is low, easily waste water treatment. The obtained disulfide tetrabenzylthiuram product has the appearance of white powder and the purity 98% or more.
Continuous-flow step-economical synthesis of thiuram disulfidesviavisible-light photocatalytic aerobic oxidation
Xu, Hao-Xing,Zhao, Ze-Run,Patehebieke, Yeersen,Chen, Qian-Qian,Fu, Shun-Guo,Chang, Shuai-Jun,Zhang, Xu-Xu,Zhang, Zhi-Liang,Wang, Xiao
supporting information, p. 1280 - 1285 (2021/02/26)
A continuous-flow photocatalytic synthesis of the industrially important thiuram disulfides has been developed, utilizing O2as the oxidant and Eosin Y as the photoredox catalyst. This highly atom- and step-economical method features much reduced reaction time as well as excellent product yield and purity, making it a sustainable and potentially scalable process for industrial production.
Disulfiram as a potent metallo-β-lactamase inhibitor with dual functional mechanisms
Chen, Cheng,Li, Jia-Qi,Sun, Le-Yun,Wu, Lin-Yu,Yang, Ke-Wu
supporting information, p. 2755 - 2758 (2020/03/17)
We report a promising NDM-1 inhibitor, disulfiram, which can covalently bind to NDM-1 by forming an S-S bond with the Cys208 residue. Its copper-containing metabolite in vivo, Cu(DTC)2, also inactivated NDM-1 through oxidizing the Zn(ii) thiolate site of the enzyme, therefore exhibiting dual functional inhibitory potential against B1 and B2 subclass MβLs.