3878-41-9Relevant academic research and scientific papers
Non-phase-transition luminescence mechanochromism of a copper(I) coordination polymer
Kwon, Eunjin,Kim, Jineun,Lee, Kang Yeol,Kim, Tae Ho
, p. 943 - 949 (2017)
A copper(I) coordination polymer, [Cu2I2L2]n (CP 1), shows luminescence mechanochromism with a color change from greenish-blue to yellow upon the application of pressure. Powder X-ray diffraction and Raman studies reveal that the changes in the bond lengths in crystalline CP 1 are the main cause of luminescence mechanochromism. The luminescence mechanochromic process of CP 1 preserves its crystallinity with a small lattice distortion, despite very high pressure, and it is a non-phase-transition process. After the addition of several drops of acetonitrile to the ground and compressed samples, the original greenish-blue emissive and crystalline states are restored. Therefore, the luminescence color conversion processes are fully reversible.
Method for preparing thionocarbamates and co-producing 2-mercaptoethanol or O-alkylthioethyl xanthogenate
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Paragraph 0101; 0102, (2018/10/11)
The invention belongs to field of mineral flotation collecting agent materials and in particular discloses a method for preparing thionocarbamates. The method comprises the following steps: carrying out esterification reaction on xanthogenate and 2-halogenated ethanol to obtain O-alkyl-S-hydroxyethyl xanthogenate; carrying out ammonolysis reaction on the O-alkyl-S-hydroxyethyl xanthogenate and fatty amine to obtain a mixture of the thionocarbamates and 2-mercaptoethanol; after carrying out alkali washing on the mixture of the thionocarbamates and the 2-mercaptoethanol, carrying out oil-water separation, wherein an oil phase is the thionocarbamates and a water phase is 2-hydroxyethanethiol salt; carrying out acid washing on the 2-hydroxyethanethiol salt to obtain 2-mercaptoethanol. The invention further provides O-alkylthioethyl xanthogenate which is prepared by enabling the 2-hydroxyethanethiol salt and alkyl halide to react to obtain 2-alkylthioethyl ethanol and enabling the 2-alkylthioethyl ethanol to react with carbon disulfide and alkali. According to the method provided by the invention, the yield of the prepared thionocarbamates, 2-mercaptoethanol and O-alkylthioethyl xanthogenate is high and the purity is high; a product is easy to separate and purity and co-production is realized; the cost is saved and the reaction efficiency is also improved; the method is green and environmentally friendly.
Silica-promoted facile synthesis of thioesters and thioethers: A highly efficient, reusable and environmentally safe solid support
Basu, Basudeb,Paul, Susmita,Nanda, Ashis K.
experimental part, p. 767 - 771 (2010/09/05)
An efficient, mild and rapid procedure for the acylation and alkylation of aromatic and aliphatic thiols mediated on a silica gel surface at room temperature is described. The protocol allows the protection of thiols under neutral heterogeneous conditions without requiring any bases or Lewis acids, and the silica gel used as the promoter can be recycled for several runs without any loss of activity.
Synthesis of sulfides under solvent- and catalyst-free conditions
Movassagh, Barahman,Soleiman-Beigi, Mohammad
experimental part, p. 409 - 411 (2010/05/01)
A simple, highly efficient, and green protocol has been developed for preparation of sulfides from alkyl or aryl thiols and benzyl-, allyl-, t-butyl, and adamantyl halides under solvent- and catalyst-free conditions.
The epoxy-Ramberg-Baecklund reaction (ERBR): A sulfone-based method for the synthesis of allylic alcohols
Evans, Paul,Johnson, Paul,Taylor, Richard J. K.
, p. 1740 - 1754 (2007/10/03)
The epoxy-Ramberg-Baecklund reaction (ERBR) is outlined, in which α,β-epoxy sulfones are converted into a range of mono-, di- and tri-substituted allylic alcohols, on treatment with base. Modification of this method enabled the preparation of enantio-enriched allylic alcohols following the diastereoselective epoxidation of enantio-enriched vinyl sulfones that were accessed efficiently from the chiral pool. The scope, optimisation and limitations of the ERBR as a method for the preparation of allylic alcohols are discussed. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
A mild and highly convenient chemoselective alkylation of thiols using Cs2CO3-TBAI
Salvatore, Ralph Nicholas,Smith, Robert A.,Nischwitz, Adam K.,Gavin, Terrence
, p. 8931 - 8935 (2007/10/03)
A mild and improved method for the synthesis of thioethers has been developed. In the presence of cesium carbonate, tetrabutylammonium iodide, and DMF, various alkyl and aryl thiols underwent S-alkylation to afford structurally diverse sulfides in high yield. Unprotected mercaptoalcohols and thioamines reacted chemoselectively at the sulfur moiety exclusively. An example of a one-pot, solid-phase synthesis of a thioether is also described.
A facile and efficient method for the reduction of sulfoxides into sulfides with an Al-NiCl2·6H2O system
Raju, B. Rama,Devi, Gitali,Nongpluh, Yoofisaca S.,Saikia, Anil K.
, p. 358 - 360 (2007/10/03)
It has been observed that alkyl aryl and dialkyl sulfoxides can be conveniently and rapidly converted to the corresponding sulfides with an Al-NiCl2-6H2O system in high yields. Ketones are not affected under these reaction conditions.
N-H insertion reactions of rhodium carbenoids. Part 3. The development of a modified Bischler indole synthesis and a new protecting-group strategy for indoles
Bashford, Katherine E.,Cooper, Anthony L.,Kane, Peter D.,Moody, Christopher J.,Muthusamy, Sendogagounder,Swanna, Elizabeth
, p. 1672 - 1687 (2007/10/03)
A modified version of the Bischler indole synthesis has been developed in which the key step is the N-H insertion reaction of rhodium carbene intermediates derived from α-diazo-β-ketoesters with anilines. Thus N-methylanilines 1 react with diazoketoesters 2 in the presence of dirhodium(II) acetate to give (N-arylamino)ketones 3, cyclisation of which using boron trifluoride-ethyl acetate or acidic ion exchange resin gives the indoles 4. In order to extend this method to the synthesis of N-unsubstituted indoles, a new protecting group strategy for indoles was developed. In this, anilines are reacted with α,β-unsaturated-esters or -sulfones to give the conjugate addition products 6 and 9, cyclisation of which gives indoles 8 and 11. The N-(2-ethoxycarbonylethyl)- and -(2-sulfonylethyl)- protecting groups are readily removed from indoles 8 and 11 by treatment with base.
Organosulfur compounds as potential fungicides: The preparation and properties of some substituted benzyl 2-hydroxyethyl oligosulfides
Ayodele, Ezekiel T.,Hudson, Harry R.,Ojo, Isaac A. O.,Pianka, Max
, p. 123 - 142 (2007/10/03)
Compounds of the general type ArCH2SnCH2CH2OH (n = 1 - 4, Ar = Ph, 2-MeC6H4. 4-MeC6H4, 4-ClC6H4, 4-MeOC6H4; n = 1 - 3, Ar = 2-ClC6H4; n = 2, Ar = 4-FC6H4; n = 3 or 4, Ar = 2-furyl) have been prepared as analogues of the trisulfide PhCH2SSSCH2CH2OH (an antimicrobial compound which occurs in the plant Petiveria alliacea) and their potential for application as agricultural fungicides has been examined. In vitro tests against Fusarium culmorum, Fusarium oxysporum and Gauennmyceles graminis showed that all compounds gave > 80% control of these organisms at 1000 ppm. Tests at 100 and 10 ppm showed varying levels of control but the activity did not depend significantly on the number of sulfur atoms present. Selected compounds were also shown to be active in vivo against Erysiphe graminis on barley seedlings, Botrytis fabae and Uromyces viciae-fabae on bean seedlings, Podosphaera leucotricha on apple seedlings, and Phytophthora infestans on potato leaf. The compounds were phytotoxic at concentrations greater than 0.33%.
The Epoxy-Ramberg-Backlund reaction: A new route to allylic alcohols
Evans, Paul,Taylor, Richard J. K.
, p. 3055 - 3058 (2007/10/03)
A new variant of the Ramberg-Backlund reaction is described, the epoxy-Ramberg-Backlund reaction (ERBR), in which α,β-epoxysulfones, on treatment with base, are converted into a range of mono-, di- and tri-substituted allylic alcohols. The scope and limitations of the ERBR are discussed.
