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Topic: Thioether


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In the News (Mon 24 Jun 19)

  
  Thioether - Wikipedia, the free encyclopedia
A thioether (also known as a sulfide) is a functional group in organic chemistry that has the structure R-S-R, where R is any organic group.
A thioether is similar to an ether except that it contains a sulfur atom in place of the oxygen.
One characteristic feature of thioethers, like other sulfur containing compounds, is that simple volatile thioethers have foul odors.
en.wikipedia.org /wiki/Thioether   (155 words)

  
 Sulfide - Wikipedia, the free encyclopedia
In fact the bonding in transition metal sulfides is highly covalent, which gives rise to their semiconductor properties, which in turn is related to the practical applications of many sulfide materials.
In organic chemistry, a sulfide usually refers to the linkage C-S-C, although the term thioether is less ambiguous.
Its repeating units are bonded together by sulfide (thioether) linkages.
en.wikipedia.org /wiki/Sulfide   (615 words)

  
 Color photographic material with homophthalimide thioether development inhibitor - Patent 4046574
A color photographic material having a silver halide emulsion layer and containing a thioether compound which is reactable on chromogenic development thereby releasing a diffusible substance which inhibits the development of the silver halide.
The thioether compound is a homophthalimide containing a removable mercapto group containing moiety in the 4-position and its nitrogen in the 2-position atom being a tertiary nitrogen.
The aforesaid DIR couplers and DIR compounds contain a thioether substituent in the coupling position, and when the colour coupling reaction takes place this substituent is split off as a diffusible mercapto compound which has development inhibiting properties and which is thereby capable of influencing the further development of the silver halide.
www.freepatentsonline.com /4046574.html   (5643 words)

  
 Academic Staff - M Schroder - School of Chemistry - University of Nottingham   (Site not responding. Last check: 2007-10-09)
Thioether Macrocyclic Chemistry: Synthesis of [RhCl([15]aneS5)]2+ and [Ru(PPh3)([15]aneS5)]2+.
Rhodium Thioether Chemistry: The Synthesis and Electrochemistry of [Rh([18]aneS6)]3+ and the Ring-Opened Vinyl Thioether Complexes [Rh([18]aneS6-H)]2+ and [Rh(Me2[18]aneN2S4-H)]2+.
Mercury(II), Silver(I) and Gold(I) Thioether Crown Chemistry: Synthesis, Electrochemistry and Structures of [(HgBr2)2([24]aneS8)], [{Ag2([24]aneS8)(CF3SO3)2(MeCN)2}], [Ag2([28]aneS8)][NO3]2 and [Au2([28]aneS8)]-[PF6]2 ([24]aneS8 = 1,4,7,10,13,16,19,22-Octathiacyclotetracosane; [28]aneS8 = 1,4,8,11,15,18,22,25-Octathia-cyclooctacosane).
www.nottingham.ac.uk /chemistry/staff/schroderpubs2003.html   (7862 words)

  
 Lubricous Deposit Formed In Situ Between Wearing Surfaces at High Temperatures   (Site not responding. Last check: 2007-10-09)
In vapor phase lubrication, an organic liquid (in our studies a thioether was used) is vaporized into a flowing air stream that is directed to sliding surfaces where lubrication is needed.
The amount of thioether used was 0.014 wt % in air (1.2 ml/hr of lubricant in 2000 ml/min air).
Thioether on cast iron; plate temperature, 500 °C; vapor temperature, 400 °C; load, 4 kg.
www.grc.nasa.gov /WWW/RT1995/5000/5140mo.htm   (393 words)

  
 [No title]   (Site not responding. Last check: 2007-10-09)
The weight ratio of the bishydroxy terminated thioether to the lactam is generally from about 15: 85 to about 85: 15, preferably from about 45: 55 to about 55: 45, and more preferably about 50: 50.
thioether and lactam of the carrier mixture, biocides, fungicides, bactericides; penetrants, surfactants, anti- kogation agents, anti-curling agents, buffers, chelating agents, and anti-bleed agents.
A method according to claim 18, wherein the bishydroxy terminated thioether is thiodiethanol and the lactam is 2-pyrrolidone.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/05899.010125&ELEMENT_SET=DECL   (3219 words)

  
 Archives of Environmental Health: Cotinine, thioether, and glucuronide excretion among active and passive bidi smokers ...   (Site not responding. Last check: 2007-10-09)
We assessed the electrophilic burden imposed by ETS by estimating subjects' urinary excretions of thioether and glucuronides.
The greatest mean urinary thioether excretion was determined for Group 2 (smokers: 6.45 [+ or -] 2.73), followed by the female members of their families (Group 3 [wives] = 4.79 [+ or -] 1.48; Group 4 [daughters] = 4.85 [+ or -] 1.37).
Means for thioether excretion for Groups 2, 3, and 4 (i.e., all the exposed groups) were significantly different from the mean for Group 1 (controls) (modified t test [p < 0.001]).
www.findarticles.com /p/articles/mi_m0907/is_6_58/ai_114009673   (1481 words)

  
 [No title]   (Site not responding. Last check: 2007-10-09)
This and the availability of an empty s*-orbital on the thioether ligand are largely responsible for a remarkable shortening of the Mo-Mo bond.
However, back-donation from the metal centers to a vacant s*-orbital of the bridging thioether represents a sizable portion of the overall bonding energy.
Expectedly, the p-acceptor ability of thioethers increases upon an increased electronegativity of the substituent on the thioether.
www.cobalt.chem.ucalgary.ca /group/ABSTRACTS/new_look_oldl_abst.html   (279 words)

  
 In Vitro Studies on Thioether Bond Formation between Hydrogenobacter thermophilus Apocytochrome c552 with ...
thioether bonds with the cysteines of apocytochrome c.
is bound covalently by two thioether bonds to the protein (25).
to form thioether bonds in the absence of a metal.
www.jbc.org /cgi/content/full/279/44/45347   (3454 words)

  
 Aciphex Clinical Pharmacology
The thioether and sulphone are the primary metabolites measured in human plasma.
In vitro studies have demonstrated that rabeprazole is metabolized in the liver primarily by cytochromes P450 3A (CYP3A) to a sulphone metabolite and cytochrome P450 2C19 (CYP2C19) to desmethyl rabeprazole.
The thioether metabolite is formed non-enzymatically by reduction of rabeprazole.
www.healthcentral.com /druglibrary/408/aciphex-clinical_pharmacology.html   (1049 words)

  
 Biosynthesis and urinary excretion of methyl sulfonium derivatives of the sulfur mustard analog, 2-chloroethyl ethyl ...   (Site not responding. Last check: 2007-10-09)
Thioether methyltransferase was previously shown to catalyze the S- adenosylmethionine-dependent methylation of dimethyl selenide, dimethyl
thioethers were tested, and all were found to be methylated in vivo:
the physiological role of thioether methyltransferase is to methylate
www.fasebj.org /cgi/content/abstract/4/15/3329   (320 words)

  
 Amit Abstract & Manuscript
In the early 19th Century, desulfurization was observed in sulfur-rich proteins (1).
In most cases, a product of this desulfurization was a thioether containing amino acid, which in 1941 was termed 'Lanthionine' (2).
Interestingly, later it was realized that several sulfur-rich proteins undergo facile desulfurization but there are no reported examples of facile thioether formation from the action of alkali on small organic disulfides such as free cystine or its analogs (3).
www.imd3.org /amitmanuscriptabstract.html   (825 words)

  
 Suicide Inactivation of Thioether S-Methyltransferase by Ethyl Vinyl Sulfide   (Site not responding. Last check: 2007-10-09)
Thioether S-methyltransferase is an important enzyme in the metabolism of sulfur and selenium-containing compounds in animals.
Since vinyl sulfonium ions are reactive toward nucleophiles, the inactivation of thioether S-methyltransferase as a result of its methylation of ethyl vinyl sulfide was investigated.
These results reveal a previously unrecognized mechanism for biochemical activation of vinyl thioethers by methylation to form reactive vinyl sulfonium ions.
pubs.acs.org /cgi-bin/abstract.cgi/bichaw/1996/35/i14/abs/bi9600815.html   (287 words)

  
 United States Patent Application: 0040167229
[0248] An acid addition salt of a substituted dialkyl ether, substituted aryl-alkyl ether, substituted dialkyl thioether, substituted dialkyl ketone, or substituted-alkyl compound is prepared by contacting the free base form of the compound with a sufficient amount of a desired acid to produce a nontoxic salt in the conventional manner.
[0250] A base addition salt of a substituted dialkyl ether, substituted aryl-alkyl ether, substituted dialkyl thioether, substituted dialkyl ketone, or substituted-alkyl compound may be prepared by contacting the free acid form of the compound with a sufficient amount of a desired base to produce the salt in the conventional manner.
The free acid form of the compound may be regenerated by contacting the salt form so formed with an acid, and isolating the free acid of the compound in the conventional manner.
appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040167229".PGNR.&OS=DN/20040167229&RS=DN/20040167229   (8452 words)

  
 Research At EMSI   (Site not responding. Last check: 2007-10-09)
In 2003, we published the qualitative detection of thioether and methylamine derivatives of naphthoquinone, anthraquinone and benzoquinone using the TMAH assay.
We have obtained the thioether derivative of this quinone, and are in the process of quantifying the adduct formed from the reaction of 2-methyl-1,4-naphthoquinone with various cellular molecules.
The thioether adducts from naphthalene have already been successfully detected in cell-free systems, and we are in the process of expanding our subcellular fraction work to include other PAHs, including phenanthrene and pyrene.
emsi.osu.edu /research/2004-2005/toxicology_of_pahs.htm   (929 words)

  
 A Novel Action of the Proton Pump Inhibitor Rabeprazole and Its Thioether Derivative against the Motility of ...
A Novel Action of the Proton Pump Inhibitor Rabeprazole and Its Thioether Derivative against the Motility of Helicobacter pylori -- Tsutsui et al.
The inhibitory effects of PPIs and the thioether derivative on the motility of H.
pylori motility by PPIs and the thioether derivative.
aac.asm.org /cgi/content/full/44/11/3069   (2297 words)

  
 Structural Studies of Processing in Galactose Oxidase
To investigate how this thioether bond forms, current work in Leeds is investigating the processing of this enzyme from its precursor.
The most noticeable changes at the active site are the arrangement of the two residues that form the thioether bond, and also of the tryptophan that stacks over the thioether bond in the mature form.
We are also in the process of trying to purify and crystallise a form of the protein in which the pro-sequence has been cleaved, but the thioether bond has not yet formed.
www.astbury.leeds.ac.uk /Report/2000/Phillips.6.html   (588 words)

  
 Growth Inhibition of Hepatoma Cells Induced by Vitamin K and Its Analogs -- Nishikawa et al. 270 (47): 28304 -- Journal ...
The thioethers were prepared by the addition of 1,8-diazabicyclo[5.4.0]undec-7-ene to an ether solution of VK
A simple addition mechanism is involved in the interaction of VK and thiols, whereas an addition-elimination mechanism is likely to be involved in the interaction of the thioether derivatives and thiols (36).
Thioether derivatives, such as 2, 3, and 5, were found to be as potent as the benchmark VK and may be useful in future testing in animal studies for possible effects on tumor growth inhibition.
www.jbc.org /cgi/content/full/270/47/28304   (5334 words)

  
 Yuri I. Murinov and Galina R. Anpilogova   (Site not responding. Last check: 2007-10-09)
Organopolymeric and organosilicon heterochain complex-forming sorbents containing aliphatic thioether or (and) weakly basic amino groups or the complex selective analytical groups are highly effective sorbents for selective recovery and concentration of noble metals.
Common faults of the sorbents with aliphatic thioether groups are slow kinetics and nonreversible sorption of noble metals ions.
The decrease of extraction and sorption constants with temperature increase is characteristic of the interaction of Ag(I) with aliphatic thioether reagents.
www.arkat-usa.org /ark/journal/2001/I09_Voronkov/261/261F.asp   (5782 words)

  
 Poly(arylene thioether-ketone) compositions improved in both melt stability and crystallinity - Patent 4826906   (Site not responding. Last check: 2007-10-09)
Even when the basic stabilizer useful in the practice of this invention is added to poly(arylene thioethers) (PATEs) other than PTKs, for example, poly(p-phenylene thioether), the melt stability is not improved but is deteriorated on the contrary.
As in the case of PTK, poly(p-phenylene thioether) and the above mixture were separately melt-extruded, thereby obtaining pellet samples (the melt-extrusion was conducted at 320.degree.
They were dry-blended in a Henschel mixer, charged under a nitrogen gas stream into a twin-screw extruder equipped with screwed rotatable in the same direction and a nozzle of 5 mm across and having a cylinder diameter of 35 mm, molten and kneaded at a cylinder temperature of 375.degree.
www.freepatentsonline.com /4826906.html   (8889 words)

  
 [No title]
On the other hand, at low pH, OH addition, both to the thioether functionality and to the aromatic ring, leads promptly only to Ph-S+-CH3 radical cations.
These observations are rationalized in terms of the highly unstable nature of Ph-S+-CH3 radical cations (formed via proton-catalyzed water elimination from Ph-(OH)-S-CH3 radicals) and their rapid conversion into Ph-S+-CH3 radical cations.
Additional experimental support for the instability of radical cations derived from aromatic thioethers with delocalized positive charge on the aromatic ring has been obtained from the OH-induced oxidation studies of phenylthioacetic acid (Ph-S-CH2-COOH).
allen.rad.nd.edu /new_pubs/ndrl4368.doc   (710 words)

  
 Information Bridge: DOE Scientific and Technical Information   (Site not responding. Last check: 2007-10-09)
Studies of radiolytically generated radical cations in aromatic hydrocarbon solvents have led to the first direct characterization of monomeric thioether radical cations in liquid solution.
Monomeric thioether radical cations in arene solvents such as toluene exist as arene-thioether mixed complex radical cations -- the first {pi}-lone pair mixed complex radical cations ever observed.
Thioether radical cations provide a valuable test system to probe the chemical influence of orbital interactions that are generic to all {pi}-type and heteroatom-containing organic radical cations, and magnetic resonance provides unsurpassed structural resolution for condensed-phase paramagnetic intermediates.
www.osti.gov /bridge/product.biblio.jsp?osti_id=10132711   (243 words)

  
 Darren Englebretsen, Institute of Fundamental Sciences   (Site not responding. Last check: 2007-10-09)
For example, HIV-1 protease analogues synthesised using both thioether and thioester ligation methods showed different levels of activity, which were related to the extent of disruption of part of the substrate binding site by the non-amide ligation linkage.
I have also applied thioether ligation to the synthesis of a selectively N15 labeled protein (~30 kDa) made from two recombinantly expressed subunits.
Englebretsen, D.R., Choma, C.T. and Robillard, G.T. Synthesis of a designed transmembrane protein by thioether ligation of solubilised segments: Na-haloacetylated peptides survived resin cleavage using TFA with EDT as scavenger.
www.massey.ac.nz /~wwifs/staff/engelbretsen.htm   (565 words)

  
 EPA SBIR Awards 2000   (Site not responding. Last check: 2007-10-09)
The Phase I objective is to develop a silica-polyamine composite material to be used in an efficient, environmentally benign system to extract oxidized mercury from coal-fire flue gas desulfurization water to levels less that 2 ppb.
Purity Systems, Inc., plans to produce a material, with a long useful lifetime, which will extract mercury II from flue gas desulfurization water containing up to 600 ppb mercury efficiently and effectively at high processing rates.
These materials will have long useful lifetimes; based on the lifetimes of similar materials, the thioether amended silica-polyamine composite materials should be effective even after 3,000 extraction cycles.
www.nttc.edu /resources/funding/awards/epa/water00/Phase1/fischer.asp   (304 words)

  
 [No title]   (Site not responding. Last check: 2007-10-09)
Non-limiting examples of G include hydrogen, alkyl, haloalkyl, vinyl, aryl, alkynyl, silyl, germyl, amine, ammonium, phosphine, phosphonium, ether, thioether, fluoro, chloro, bromo, iodo, borane, borate, alane and aluminate groups or any combination of such groups that do not completely prohibit formation of diarylsilyl bridged bisindenyl compounds.
The linker group may be an alkyl, vinyl, phenyl, alkynyl, silyl, germyl, amine, ammonium, phosphine, phosphonium, ether, thioether, borane, borate, alane or aluminate groups.
The cyclopentadienyl ring system may be substituted with alkyl, perhaloalkyl, vinyl, aryl, alkynyl, silyl, germyl, amine, ammonium, phosphine, phosphonium, ether, thioether, fluoro, chloro, bromo, iodo, borane, borate, alane and aluminate groups or any combination of such groups that do not completely prohibit formation of diarylsilyl bridged biscyclopentadienyl compounds.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/58913.010816&ELEMENT_SET=DECL   (9621 words)

  
 United States Patent: 4,590,240
The reaction is run in the absence of oxygen by blanketing the reactants with nitrogen.
The specific curing agent employed is not critical to the practice of the applicants' invention.
To prevent premature cure of the insulating window glass sealant composition the thioether-modified polymer and the curing agent may be separately packaged and mixed immediately prior to application.
pweb.netcom.com /~jhm/4590240.htm   (3367 words)

  
 Identification of novel sulfur-containing bacterial polyesters: biosynthesis of ...   (Site not responding. Last check: 2007-10-09)
Identification of novel sulfur-containing bacterial polyesters: biosynthesis of poly(3-hydroxy-S-propyl-{omega}-thioalkanoates) containing thioether linkages in the side chains -- Ewering et al.
According to the lability of thioether compounds to acid-catalysed
thioether linkages in the side chain are very glutinous and
mic.sgmjournals.org /cgi/content/full/148/5/1397   (3089 words)

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