WorldWideScience

Sample records for arylsulfonates

  1. Photochemical surface modification of poly(arylsulfone) ultrafiltration membrane and covalent immobilization of enzyme

    Institute of Scientific and Technical Information of China (English)

    SONG Hua; WU Guang-xia; LIU Kai

    2004-01-01

    The sensitivity of poly(arylsulfone)(PSf) for UV irradiation in different solvents(water and ethanol) was investigated. It is confirmed that acrylic acid(AA) and acrylamide(AAm) are grafted only onto the surface of the membrane instead of the interior by FTIR and scanning electron microscope(SEM). The membrane performance(ΔJ/J0 and contact angleθ) after photografting was studied. In the range of conditions used, the grafting yield increases with irradiation time and monomer concentration growing. After photografting and N-3-dimethyl-aminopropyl-N' -ethycarbodiimide hydrochloride(EDC) activation, PSf membrane was immobilized with hydrogen peroxide oxidoreductase, and showed a higher activity than the control membrane.

  2. One-step synthesis of α,β-unsaturated arylsulfones by a novel multicomponent reaction of aromatic aldehydes,chloroacetonitrile, benzenesulfinic acid sodium salt

    Institute of Scientific and Technical Information of China (English)

    Lei Zhang; Mao Hua Ding; Hong Yun Guo

    2012-01-01

    A new and green method for the synthesis of α,β-unsaturated arylsulfones had been achieved through the condensation of aromatic aldehydes,chloroacetonitrile,benzenesulfinic acid sodium salt in the presence of 1-butyl-3-methyl imidazolium hydroxide ([bmim]OH) in EtOH under reflux.The ionic liquid was recovered and recycled for subsequent reactions.The advantages of this protocol were non-toxic,easy work-up and good yields.

  3. A Facile and Efficient Synthesis of Arylsulfonates and Arylsulfonyl Hydrazides under Solvent Free Conditions

    Institute of Scientific and Technical Information of China (English)

    ZHAO,Na; WANG,Yu-Lu; WANG,Jin-Ye

    2004-01-01

    @@ Organosulfur compounds are useful materials and most of them have pharmacological properties. The sulfonic esters are important intermediates in organic synthesis and used as acaricides and thermal recording materials. The sulfonyl hydrazides are valuable as inhibitors, agrochemical fungicides, insecticides and photographic images. Some methods have been reported for preparing these compounds to date. Usually, these reactions were carried out in organic solvent[1,2]such as pyridine and DMF. Even up-to date solid-phase synthesis requires solvent. What's more, they have other drawbacks including long reaction time, producing much wastes and by-products, tedious experimental procedure.

  4. Novel chemistry of alpha-tosyloxy ketones: applications to the solution- and solid-phase synthesis of privileged heterocycle and enediyne libraries

    DEFF Research Database (Denmark)

    Nicolaou, K C; Montagnon, T; Ulven, T;

    2002-01-01

    New synthetic technologies for the preparation and elaboration of alpha-tosyloxy ketones in solution- and on solid-phase are described. Both olefins and ketones serve as precursors to these relatively stable chemical entities: olefins via a novel one-pot epoxidation, arylsulfonic acid displacement...

  5. Synthesis of Xylitan Derivatives and Preliminary Evaluation of in Vitro Trypanocidal Activity

    Directory of Open Access Journals (Sweden)

    Paula Regina Elias

    2016-10-01

    Full Text Available A series of novel xylitan derivatives derived from xylitol were synthesized using operationally simple procedures. A xylitan acetonide was the key intermediate used to prepare benzoate, arylsulfonate esters and 1,2,3-triazole derivatives of xylitan. These compounds were evaluated for their in vitro anti-Trypanosoma cruzi activity against trypomastigote and amastigote forms of the parasite in T. cruzi-infected cell lineages. Benznidazole was used as positive control against T. cruzi and cytotoxicity was determined in mammalian L929 cells. The arylsulfonate xylitan derivative bearing a nitro group displayed the best activity of all the compounds tested, and was slightly more potent than the reference drug benznidazole. The importance of the isopropylidene ketal moiety was established and the greater lipophilicity of these compounds suggests enhancement in cell penetration.

  6. Double Heteroatom Functionalization of Arenes Using Benzyne Three‐Component Coupling†

    Science.gov (United States)

    García‐López, José‐Antonio; Çetin, Meliha

    2015-01-01

    Abstract Arynes participate in three‐component coupling reactions with N, S, P, and Se functionalities to yield 1,2‐heteroatom‐difunctionalized arenes. Using 2‐iodophenyl arylsulfonates as benzyne precursors, we could effectively add magnesiated S‐, Se‐, and N‐nucleophilic components to the strained triple bond. In the same pot, addition of electrophilic N, S, or P reagents and a copper(I) catalyst trapped the intermediate aryl Grignard to produce a variety of 1,2‐difunctionalized arenes. PMID:25580700

  7. The ssu Locus Plays a Key Role in Organosulfur Metabolism in Pseudomonas putida S-313

    OpenAIRE

    Kahnert, Antje; Vermeij, Paul; Wietek, Claudia; James, Peter; Leisinger, Thomas; Kertesz, Michael A.

    2000-01-01

    Pseudomonas putida S-313 can utilize a broad range of aromatic sulfonates as sulfur sources for growth in sulfate-free minimal medium. The sulfonates are cleaved monooxygenolytically to yield the corresponding phenols. miniTn5 mutants of strain S-313 which were no longer able to desulfurize arylsulfonates were isolated and were found to carry transposon insertions in the ssuEADCBF operon, which contained genes for an ATP-binding cassette-type transporter (ssuABC), a two-component reduced flav...

  8. Biostimulation of Oil Sands Process-Affected Water with Phosphate Yields Removal of Sulfur-Containing Organics and Detoxification.

    Science.gov (United States)

    Quesnel, Dean M; Oldenburg, Thomas B P; Larter, Stephen R; Gieg, Lisa M; Chua, Gordon

    2015-11-01

    The ability to mitigate toxicity of oil sands process-affected water (OSPW) for return into the environment is an important issue for effective tailings management in Alberta, Canada. OSPW toxicity has been linked to classical naphthenic acids (NAs), but the toxic contribution of other acid-extractable organics (AEOs) remains unknown. Here, we examine the potential for in situ bioremediation of OSPW AEOs by indigenous algae. Phosphate biostimulation was performed in OSPW to promote the growth of indigenous photosynthetic microorganisms and subsequent toxicity and chemical changes were determined. After 12 weeks, the AEO fraction of phosphate-biostimulated OSPW was significantly less toxic to the fission yeast Schizosaccharomyces pombe than unstimulated OSPW. Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) analysis of the AEO fraction in phosphate-biostimulated OSPW showed decreased levels of SO3 class compounds, including a subset that may represent linear arylsulfonates. A screen with S. pombe transcription factor mutant strains for growth sensitivity to the AEO fraction or sodium dodecylbenzenesulfonate revealed a mode of toxic action consistent with oxidative stress and detrimental effects on cellular membranes. These findings demonstrate a potential algal-based in situ bioremediation strategy for OSPW AEOs and uncover a link between toxicity and AEOs other than classical NAs.