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Search Results: 1 - 10 of 277 matches for " Thies Thiemann "
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Liquid Etherification of Alkoxybenzyl Alcohols, Cinnamyl Alcohols and Fluorinated Phenylalkenols with Platinum on Carbon (Pt/C) and Palladium on Carbon (Pd/C)  [PDF]
Thies Thiemann
International Journal of Organic Chemistry (IJOC) , 2018, DOI: 10.4236/ijoc.2018.81005
Abstract: In the presence of either Pd/C or Pt/C, 4-alkoxybenzyl alcohols, 4-alkoxy-phenylalkyl alcohols and cinnamyl alcohols undergo liquid etherification to bis(4-alkoxybenzyl) ethers, bis[(4-alkoxybenzyl)alkyl] ethers and bis(cin-namyl) ethers at temperatures of 100°C - 135°C. In a number of cases, Pt/C and Pd/C as catalysts, also when they are doped with Ru, show distinct differences when the reactions run in air, with an oxidative dehydrogenation of the alcohols as side-reaction, yielding the corresponding ketones and aldehydes as by-products. Also, the reactivity of fluorinated phenylalkenols under these conditions has been investigated. Furthermore, the immobilization of alkyl aryl ethers on silica within a column with passage of hexane as solvent was found to lead to the formation and elution of styrenes from the column in fair yield.
Hydrogenation of Alkenes with NaBH4, CH3CO2H, Pd/C in the Presence of O- and N-Benzyl Functions  [PDF]
Nuha Al Soom, Thies Thiemann
International Journal of Organic Chemistry (IJOC) , 2016, DOI: 10.4236/ijoc.2016.61001
Abstract: NaBH4, CH3CO2H, Pd/C has been described as an effective reagent system to hydrogenate alkenes. Here, we show that the hydrogenation occurs chemoselectively, making it possible to hydrogenate alkenes under Pd/C catalysis with hydrogen created in situ without O- or N-debenzylation.
3-Benzoylacrylonitrile [(E)-4-Oxo-4-phenyl-2-butenenitrile]
Thies Thiemann,Masataka Watanabe
Molbank , 2003, DOI: 10.3390/m334
Abstract: No abstract available
Brominated Thiophenes as Precursors in the Preparation of Brominated and Arylated Anthraquinones
Thies Thiemann,Yasuko Tanaka,Jesus Iniesta
Molecules , 2009, DOI: 10.3390/molecules14031013
Abstract: Brominated anthraquinones can be synthesized directly from bromothiophenes when these are reacted with 1,4-naphthoquinones in the presence of meta-chloroperoxybenzoic acid. The bromoanthraquinones are versatile building blocks in the preparation of arylated anthraquinones and of extended π-systems with interspersed anthraquinone units.
Metacyclo[2](2,5)thiophenophanes with extended pi -systems
Thies Thiemann,Kazuya Arima,Taisuke Matsumoto,Yuang-Qiang Li
Organic Communications , 2008,
Abstract: 12,13-Dibromometa[2](2,5)thiophenophane was subjected to Suzuki-Miyaura cross coupling to yield 12,13-diarylmeta[2](2,5)thiophenophanes, cyclophanes with extended p -systems
2-Propoxybenzamide
Yosef Al Jasem,Bassam al Hindawi,Thies Thiemann,Fraser White
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812033326
Abstract: In the title molecule, C10H13NO2, the amide –NH2 group is oriented toward the propoxy substituent and an intramolecular N—H...O hydrogen bond is formed between the N—H group and the propoxy O atom. The benzene ring forms dihedral angles of 12.41 (2) and 3.26 (2)° with the amide and propoxy group mean planes, respectively. In the crystal, N—H...O hydrogen bonds order pairs of molecules with their molecular planes parallel, but at an offset of 0.73 (2) to each other. These pairs are ordered into two types of symmetry-related columns extended along the a axis with the mean plane of a pair in one column approximately parallel to (-122) and in the other to (-1-22). The two planes form dihedral angle of 84.40 (1)°. Overall, in a three-dimensional network, the hydrogen-bonded pairs of molecules are either located in (-1-22) or (-122) layers. In one layer, each pair is involved in four C—H...O contacts, twice as a donor and twice as an acceptor. Additionally, there is a short C—H...C contact between a benzene C—H group and the amide π-system.
Microplastics and Wastewater Treatment Plants—A Review  [PDF]
Rana Zeeshan Habib, Thies Thiemann, Ruwaya Al Kendi
Journal of Water Resource and Protection (JWARP) , 2020, DOI: 10.4236/jwarp.2020.121001
Abstract: The emission of microplastics into nature poses a threat to aquatic and terrestrial ecosystems. Their penetration of the food chain presents a danger to human health as well. Wastewater treatment plants can be seen as the last barrier between microplastics and the environment. This review focuses on the impact of waste treatment plants in retaining microplastics. Studies show that no wastewater treatment method leads to a complete retention of microplastics, and so wastewater treatment plants themselves are viewed as point sources for the discharge of microplastics into the aquatic environment. Problems associated with the utilization of microplastic loaded sewage sludge are also discussed in the review.
Facile, Direct Reaction of Benzaldehydes to 3-Arylprop-2-Enoic Acids and 3-Arylprop-2-Ynoic Acids in Aqueous Medium  [PDF]
Thies Thiemann, Mohamed W. Elshorbagy, Mostafa H. F. A. Salem, Siraj A. N. Ahmadani, Yosef Al-Jasem, Mariam Al Azani, Mazen A. M. Al-Sulaibi, Bassam Al-Hindawi
International Journal of Organic Chemistry (IJOC) , 2016, DOI: 10.4236/ijoc.2016.62014
Abstract: Wittig reactions of benzaldehydes, alkanals, and cycloalkanals as well as of acetophenones are carried out with alkoxycarbonyl methylidenetriphenylphosphoranes in 10 w% aqueous NaOH, where the cinnamates and alkenoates produced are hydrolysed in situ and the corresponding acids are obtained after mostly simple extractive work-up, often without employing organic solvents. Under the same conditions, benzaldehydes are reacted with alkoxycarbonyl bromomethy-lidenephosphorane to produce 3-arylprop-2-ynoic acids (arylpropiolic acids).
QCD in the axial gauge
M. Thies
Physics , 1995, DOI: 10.1016/0146-6410(96)00012-9
Abstract: We review a recent attempt to deal with non-perturbative features of QCD by analytical means, using a manifestly gauge invariant, canonical approach.
Duality between quark-quark and quark-antiquark pairing in 1+1 dimensional large N models
Michael Thies
Physics , 2003, DOI: 10.1103/PhysRevD.68.047703
Abstract: We identify a canonical transformation which maps the chiral Gross-Neveu model onto a recently proposed Cooper pair model. Baryon number and axial charge are interchanged. The same physics can be described either as chiral symmetry breaking (quark-antiquark pairing) or as superconductivity (quark-quark pairing).
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