Liquid hydrogen chloride solvent system. XII. Reactions of some sulfur, selenium, and tellurium compounds

1969 ◽  
Vol 47 (10) ◽  
pp. 1675-1680 ◽  
Author(s):  
M. E. Peach
Keyword(s):  
Hydrogen Chloride ◽  
Chloride Solution ◽  
Dimethyl Sulfide ◽  
Chloride Ion ◽  
Solvent System ◽  
Sulfenyl Chloride ◽  
Selenium Dichloride ◽  
Sulfur Dichloride ◽  
New Compounds ◽  
Tellurium Tetrachloride

The ions Me2SCl+ and MeSCl2+ have been prepared in hydrogen chloride solution from the oxidation of dimethyl sulfide and methanesulfenyl chloride with chlorine, or from methyl sulfur trichloride (MeSCl2+), and characterized as their tetrachloroborates and hexafluorophosphates. Et2SCl+BCl4− and EtSCl2+BCl4− have been prepared analogously. Dimethyl selenium and dimethyl tellurium solutions were oxidized with chlorine to dimethyl selenium dichloride and dimethyl tellurium dichloride.Methanesulfenyl chloride solution was ionized due to the protonation of sulfur, and not to the loss of a chloride ion. Methylchlorosulfonium hexafluorophosphate has been characterized. Methane- and ethane-sulfenyl chloride solutions reacted with boron trichloride giving (RSCl)2BCl3.Sulfur tetrachloride, selenium tetrachloride, and tellurium tetrachloride were sparingly soluble and showed no acidic or basic properties in the solvent. Sulfur monochloride, sulfur dichloride, selenium monochloride, and tellurium dichloride were non-basic in solution.The new compounds, Me2S2.BCl3 and Me2Te.BCl3, have been prepared and characterized.

scholarly journals A Regioselective Synthesis of Novel Functionalized Organochalcogen Compounds by Chalcogenocyclofunctionalization Reactions Based on Chalcogen Halides and Natural Products

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3729
Author(s):  
Maxim V. Musalov ◽  
Vladimir A. Potapov ◽  
Vladimir A. Yakimov ◽  
Maria V. Musalova ◽  
Arkady A. Maylyan ◽  
...  
Keyword(s):  
Natural Products ◽  
Methylene Chloride ◽  
Solvent System ◽  
Regioselective Synthesis ◽  
Sodium Metabisulfite ◽  
Two Phase ◽  
Sulfur Dichloride ◽  
Selenium Dibromide ◽  
Tellurium Tetrachloride ◽  
Distinguishing Features

The regioselective synthesis of novel functionalized condensed organochalcogen compounds by chalcogenocyclofunctionalization reactions based on chalcogen halides and the natural products thymol and carvacrol has been developed. The reactions of selenium dibromide with allyl thymol and allyl carvacrol proceeded in methylene chloride at room temperature in the presence of NaHCO3 affording bis[(7-isopropyl-4-methyl-2,3-dihydro-1-benzofuran-2-yl)methyl] and bis[(4-isopropyl-7-methyl-2,3-dihydro-1-benzofuran-2-yl)methyl] selenides in 90–92% yield. Similar sulfides were obtained in 70–72% yields by the reaction of sulfur dichloride in chloroform under reflux. Trihalotellanes containing the same organic moieties were synthesized from allyl thymol, allyl carvacrol and tellurium tetrachloride or tetrabromide in quantitative yields. Corresponding functionalized ditellurides were prepared in 91–92% yields by the reduction of the trichlorotellanes with sodium metabisulfite in two-phase solvent system. The comparison of reactivity of sulfur, selenium and tellurium halides in chalcogenocyclofunctionalization and distinguishing features of each reaction were discussed.

scholarly journals Fractionation of Lycopodiaceae Alkaloids and Evaluation of Their Anticholinesterase and Cytotoxic Activities

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6379
Author(s):  
Aleksandra Dymek ◽  
Jarosław Widelski ◽  
Krzysztof Kamil Wojtanowski ◽  
Vladyslav Vivcharenko ◽  
Agata Przekora ◽  
...  
Keyword(s):  
Solvent System ◽  
Reversed Phase ◽  
Huperzine A ◽  
Process Conditions ◽  
Cytotoxic Activities ◽  
Ache Inhibitors ◽  
Methanolic Extracts ◽  
Silanized Silica ◽  
Vacuum Liquid Chromatography ◽  
New Compounds

In view of the abundant evidence that Lycopodiaceae alkaloids, including the well-known huperzine A (HupA), are among the potent acetylcholinesterase (AChE) inhibitors, an attempt was made to search for new compounds responsible for this property. For this purpose, three plant species belonging to the Lycopodiaceae family, commonly found in the Euro-Asia region, were subjected to the isolation of bioactive compounds, their identification and subsequent evaluation of their anticholinesterase and cytotoxic activities. Methanolic extracts of two Lycopodium and one Hupezia species were obtained via optimized pressurized liquid extraction (PLE) and then pre-purified using innovative gradient vacuum liquid chromatography (gVLC). For the first time, three sorbents of different porosity packed in polypropylene cartridges and mobile phase systems of different polarity were used to elute the target compounds. This technique proved to be a rapid tool for the obtainment of alkaloid fractions and allowed one to select the appropriate process conditions to yield potent AChE inhibitors in each of the species studied. More than 100 collected fractions were analyzed via HPLC/ESI-QTOF-MS, which enabled one to detect more than 50 compounds, including several new ones previously unreported. Some of them were present in high purity fractions (60–90% of the established purity). TLC bioautography assays proved that the analyzed species are rich sources of AChE inhibitors, but H. selago showed the highest anti-AChE activity. Additionally, the modified silanized silica gel sorbent used allowed one to isolate L. clavatum alkaloids more efficiently using an aqueous reversed-phase solvent system. Furthermore, the tested extracts from the three plant extracts were found to be safe, as they did not exhibit cytotoxicity to skin fibroblasts.

SANICRO 70

Alloy Digest ◽  
1995 ◽  
Vol 44 (7) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
Hydrogen Chloride ◽  
Stress Corrosion Cracking ◽  
Chloride Ion ◽  
Heat Treating ◽  
Temperature Resistance

Abstract SANDVIK SANICRO 70 is an austenitic alloy with good high temperature resistance to carburization and nitridation. The alloy is also very resistant to chloride-ion stress-corrosion cracking and to hydrogen chloride. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as heat treating and joining. Filing Code: Ni-483. Producer or source: Sandvik.

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