Results 21 to 30 of about 35,246 (344)

A Study on the Chemistry and Biological Activity of 26-Sulfur Analogs of Diosgenin: Synthesis of 26-Thiodiosgenin S-Mono- and Dioxides, and Their Alkyl Derivatives

Molecules, 2022
A chemoselective procedure for MCPBA oxidation of 26-thiodiosgenin to corresponding sulfoxides and sulfone was elaborated. An unusual equilibration of sulfoxides in solution was observed.
Aneta M. Tomkiel, Dorota Czajkowska-Szczykowska, Ewa Olchowik-Grabarek, Lucie Rárová, Szymon Sękowski, Jacek W. Morzycki   +5 more
doaj   +1 more source

Organocatalytic sulfoxidation [PDF]

Tetrahedron, 2021
Treatment of a sulfide with a catalytic amount of a 1,3 diketone in the presence of silica sulfuric acid as a co-catalyst and hydrogen peroxide (50% aq) as the stoichiometric oxidant leads to the corresponding sulfoxide product. The reaction is effective for diaryl, aryl-alkyl and dialkyl sulfides and is tolerant of oxidisable and acid sensitive ...
Stuart C. Davidson, Gabriel dos Passos Gomes, Leah R. Kuhn, Igor V. Alabugin, Alan R. Kennedy, Nicholas C.O. Tomkinson   +5 more
openaire   +3 more sources

Transfer of electrophilic NH using convenient sources of ammonia: direct synthesis of N–H sulfoximines from sulfoxides [PDF]

, 2016
The transfer of nitrogen atoms is extremely valuable in the preparation of medicinal compounds. Here, a new system for NH transfer is developed to prepare sulfoximines, which are emerging as valuable motifs for drug discovery.
Bentley, Bizet, Bizet, Buglioni, Carroccia, Cheng, Collins, Collins, Collins, Dauban, Degennaro, Dohi, Dong, Fiori, Goldberg, Gutmann, Iacobucci, Ivanov, Jat, Johnson, Langner, Lücking, Lücking, Mancheño, Mendiola, Miao, Miyasaka, Ochiai, Okamura, Rit, Roizen, Romero, Shen, Silva, Souto, Starkov, Tamura, Teng, Wang, Weber, Williamson, Zenzola, Zhu, Zou   +43 more
core   +1 more source

Enantiomeric oxidation of organic sulfides by the filamentous fungi Botrytis cinerea, Eutypa lata and Trichoderma viride [PDF]

, 2007
The biotransformations of a series of substituted sulfides were carried out with the filamentous fungi Botrytis cinerea, Eutypa lata and Trichoderma viride.
Annunziata, Auret, Bolm, Cashman, Collins, Cristina Pinedo-Rivilla, Fernández, Gamma, Holland, Holland, Holland, Holland, Holland, Holland, Holland, Holland, Holland, Isidro G. Collado, Jones, Josefina Aleu, Khatib, Komatsu, Kubec, Kyung, Madesclaire, Mata, Page, Ricci, Sang   +28 more
core   +2 more sources

Electrochemical oxidations of thioethers: Modulation of oxidation potential using a hydrogen bonding network

Electrochemistry Communications, 2019
A highly efficient chemo-selective electrochemical oxidation of thioethers to sulfoxides and sulfones was developed. The hydrogen bonding network generated from hexafluoro-2-propanol (HFIP) and acetic acid (AcOH) plays an important role in the modulation
Shiwen Liu, Bocheng Chen, Yi Yang, Yuhao Yang, Qianjin Chen, Xiaojun Zeng, Bo Xu   +6 more
doaj   +1 more source

Membrane-free selective oxidation of thioethers with water over a nickel phosphide nanocube electrode

Cell Reports Physical Science, 2021
Summary: Developing a membrane-free oxidation reaction, especially using water as the oxygen source, to generate high-value chemicals with high selectivity for replacing low-value O2 over a cost-effective catalyst is significant.
Shuyan Han, Changhong Wang, Yanmei Shi, Cuibo Liu, Yifu Yu, Siyu Lu, Bin Zhang   +6 more
doaj   +1 more source

Can acyclic conformational control be achieved via a sulfur-fluorine gauche effect? [PDF]

, 2015
The gauche conformation of the 1,2-difluoroethane motif is known to involve stabilising hyperconjugative interactions between donor (bonding, σC-H) and acceptor (antibonding, σ*C-F) orbitals.
Daniliuc, C, Gilmour, R, Holland, MC, Houk, KN, Thiehoff, C   +4 more
core   +1 more source

Unexpected nucleophilic participation and rearrangement of DBU in reactions with saccharin derivatives [PDF]

, 2003
DBU attacks saccharin derivatives with subsequent rearrangement to give rise to 3-[3'-(1"-azepin-2"-onyl)propylamino]-1,2-benzisothiazole-1,1-dioxide 2 after work ...
Barkley, James V., Bethell, Donald, Bulman Page, Philip C., Vahedi, Hooshang   +3 more
core   +1 more source

Highly Efficient Selective Oxygenation of Sulfides to Sulfoxides by Oxalic Acid Dihydrate in the Presence of H2O2

E-Journal of Chemistry, 2012
A highly efficient method for the oxidation of sulfides to sulfoxides using oxalic acid dihydrate in the presence of hydrogen peroxide has been developed.
Masoud Mokhtary, Mohammad Qandalee, Masoumeh Rastegar Niaki   +2 more
doaj   +1 more source

Desulfurization of Dibenzothiophene and Oxidized Dibenzothiophene Ring Systems

Molecules, 2010
Lithium, used in conjunction with sodium metal, produces a high yield of biphenyl when reacted with dibenzothiophene, dibenzothiophene sulfoxide or dibenzothiophene sulfone.
Diego P. Morales, Alexander S. Taylor, Steven C. Farmer   +2 more
doaj   +1 more source