ChemInform Abstract: CROWN THIOETHERS AND ACYCLIC ANALOGS CONTAINING (Z)-DITHIOETHENE UNITS

1985 ◽  
Vol 16 (36) ◽  
Author(s):  
W. SCHROTH ◽  
H. POLESCHNER ◽  
M. GAEBLER ◽  
A. LIST ◽  
R. RADEGLIA
Keyword(s):  
Crown Thioethers

Remote asymmetric induction in free radical cycloaddition leading to trans-cyclohexano-fused 12-membered crown thioethers

1995 ◽  
Vol 36 (13) ◽  
pp. 2293-2294 ◽  
Author(s):  
Emmanuil I. Troyansky ◽  
Rustem F. Ismagilov ◽  
Yury A. Strelenko ◽  
Vyacheslav V. Samoshin ◽  
Dmitry V. Demchuk ◽  
...  
Keyword(s):  
Free Radical ◽  
Asymmetric Induction ◽  
Crown Thioethers

Synthese des offenkettigen Thioetherthiols ′S8′ -H2 und der Kronenthioether ′S8′ , Bzo2-12 S 4, Bzo4-24 S 8 und Bzo6-36 S 12; Röntgenstrukturanalyse von Bzo4-24 S 8 [1] / Syntheses of the Open-Chain Thioetherthiol ′S8′-H2 and the Crown Thioethers ′S8′, Bzo2-12 S 4, Bzo4-24 S 8 and Bzo6-36 S 12; X-Ray Structure of Bzo4-24 S 8

1991 ◽  
Vol 46 (2) ◽  
pp. 209-215 ◽  
Author(s):  
Dieter Seilmann ◽  
Peter Lechner ◽  
Matthias Moll ◽  
Falk Knoch
Keyword(s):  
Structure Determination ◽  
Open Chain ◽  
X Ray ◽  
Crown Thioethers

The octadendate thioetherthiol ′S8′ - H2 was synthesized by alkylation of the tetradendate thioetherthiol ′S4′ - H2. Further products were the disulfide ′S8′, resulting from the oxidation of ′S8′ - H2, and the crown thioethers Bzo2 -12S4, Bzo4 -24S8 and Bzo6 -36S12. Bzo4 -24S8 was characterized by X-ray structure determination.

Polymer Pendant Crown Thioethers for Removal of Mercury from Acidic Waste Streams-Characterization and Extraction Performance

2002 ◽  
Vol 757 ◽  
Author(s):  
Theodore F. Baumann ◽  
Glenn A. Fox ◽  
Art J. Nelson ◽  
Joy C. Andrews ◽  
Darrell B. Bishop ◽  
...  
Keyword(s):  
Binding Sites ◽  
Cost Effective ◽  
Loading Capacity ◽  
High Concentration ◽  
Waste Streams ◽  
Acidic Solutions ◽  
Crown Thioethers ◽  
Ph Range ◽  
Competing Ions

ABSTRACTThe removal and immobilization of mercury(II) ions from industrial waste streams is a difficult and expensive problem requiring a robust extractant that is resistant to corrosive conditions. We have now developed an acid-resistant thiacrown polymer that has potential utility as a selective and cost-effective Hg2+ extractant. A new crown thioether, 2-hydroxymethyl-1,4,8,11,14-pentathiacycloheptadecane ([17] aneS5-OH), was synthesized through reaction of 2,3-dimercapto-1-propanol with 4,7,10-trithiatridecane-1,13-di-p-toluenesulfonate; then treated with thionyl chloride to form 2-chloromethyl-1,4,8,11,14-pentathiacycloheptadecane ([17] aneS5-Cl); followed by conversion to 2-(N-methyl)aminomethyl-1,4,8,11,14-pentathiacycloheptadecane ([17] aneS5-NHMe), through reaction with methylamine. The synthesis of the 4-vinylbenzyl-substituted thiacrown was readily accomplished by treating with 4-vinylbenzyl chloride. Co-polymerization of the 4-vinylbenzyl-substituted thiacrown with DVB (80% divinylbenzene) using AIBN as the radical initiator generated the highly cross-linked crown thioether polymer. The polymer based material was tested for Hg(II) extraction activity from acidic solutions. The material was found to extract 95+% of the Hg in a pH range of around 1.5 to over 6.0, with contact times of less than 30 min and in the presence of high concentration of competing ions such as Pb, Cd, Al, and Fe. The spent polymer could also be stripped of the Hg2+ and reused without sufficient loss of loading capacity. Characterization of the binding sites by XPS and XAS show only some of the S atoms in the thiacrown participate in the binding of Hg. Our results indicate this polymer has the potential to treat highly acidic wastes efficiently. This thiacrown polymer is far more effective in extracting Hg2+ from aqueous solution than previously reported Hg2+ extrac-tants, not only being very fast and efficient and selective, but also independent of pH.

ChemInform Abstract: Synthesis of Sulfur-Containing Large-Membered Heterocycles (Crown Thioethers) with Bis(o-mercapto)phenyl Sulfide.

ChemInform ◽  
2010 ◽  
Vol 30 (49) ◽  
pp. no-no
Author(s):  
Juzo Nakayama ◽  
Ayako Kaneko ◽  
Yoshiaki Sugihara ◽  
Akihiko Ishii
Keyword(s):  
Phenyl Sulfide ◽  
Crown Thioethers ◽  
Sulfur Containing

Conjugated crown thioethers and strained cyclic alkynes by nucleophilic SN′-reaction

1995 ◽  
Vol 36 (11) ◽  
pp. 1835-1838 ◽  
Author(s):  
Rolf Gleiter ◽  
Harald Röckel ◽  
Bernhard Nuber
Keyword(s):  
Crown Thioethers

ChemInform Abstract: Conjugated Crown Thioethers and Strained Cyclic Alkynes by Nucleophilic SN′-Reaction.

ChemInform ◽  
2010 ◽  
Vol 26 (29) ◽  
pp. no-no
Author(s):  
R. GLEITER ◽  
H. ROECKEL ◽  
B. NUBER
Keyword(s):  
Crown Thioethers

Crown thioethers and 1,4-dithiacyclanes immobilized on silica carrier: preparation and studies of complexation affinity towards metal ions

1996 ◽  
Vol 6 (1) ◽  
pp. 9-11 ◽  
Author(s):  
Emmanuil I. Troyansky ◽  
Mariam S. Pogosyan ◽  
Nataliya M. Samoshina ◽  
Gennady I. Nikishin ◽  
Vyacheslav V. Samoshin ◽  
...  
Keyword(s):  
Metal Ions ◽  
Crown Thioethers

ChemInform Abstract: Syntheses, Structures, and Complexation of cis- and trans-Cycloheptane-1,2-diyl-fused Crown Thioethers ([12]ansS4).

ChemInform ◽  
2011 ◽  
Vol 42 (39) ◽  
pp. no-no
Author(s):  
Akihiko Ishii ◽  
Sohei Asami ◽  
Yoko Fujiwara ◽  
Aya Ono ◽  
Norio Nakata
Keyword(s):  
Crown Thioethers ◽  
Cis And Trans
Sign in / Sign up

Export Citation Format

Share Document