Organic Chemistry - Prof. Hans J. Schäfer

2006

• K.Dreger, B.Zou, Z.Mu, H.J.Galla, L.Chi, H.Fuchs, H.J.Schäfer, Synthesis and surface properties of new ureas and amides at different interfaces, Langmuir 2006, 22, 1619-1625.

• K.Dreger, L. Zhang, H.J.Galla, H. Fuchs, L. Chi, E.U.Würthwein, H.J.Schäfer, Influence of an Amide Group in Methyl Octadecanoiates on the Monolayer Stability, Langmuir 2006, 22, 1586-1594.

• H.Schäfer, Elektrosynthese und Nachwachsende Rohstoffe, GDCh-Wochenschau, 30.01.2006.

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2005

• U.St. Bäumer, H.J. Schäfer, Cleavage of alkenes by anodic oxidation, J. Applied Electrochem. 2005, 35, 1283-1292.

• M. Schämann, H.J. Schäfer, Reaction of enamines and mediated anodic oxidation of carbohydrates with the 2,2,6,6-tetramethylpiperidine-1-oxoammonium ion (TEMPO+), Electrochim. Acta 2005, 50, 4956-4972.

• L.Wang, S. Jacobi, J. Sun, M. Overs, H. Fuchs, H.J.Schäfer, X. Zhang, J. Shen, L. Chi, Anisotropic aggregation and phase transition in Langmuir monolayers of methyl/ethyl esters of 2,3-dihydroxy fatty acids, J. Colloids and Interface Science 2005, 285, 814-820.

• B.Zou, K.Dreger, Ch. Mück-Lichtenfeld, S. Grimme, H.J.Schäfer, H.Fuchs, L. Chi, Simple and complex lattices of N-alkyl fatty acid amides on a highly oriented pyrolytic graphite surface, Langmuir 2005, 21, 1364-1370.

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2004

• H.J. Schäfer, Comparison of Chemical and Electrochemical Methods in Organic Synthesis, in Vol. 8 (ed. H.J.Schäfer) of Encyclopedia of Electrochemistry (eds. A.J.Bard, M.Stratmann) Wiley-VCh, 2004, 73-92.

• H.J. Schäfer, Anodic Reactions of Alkanes, Alkenes, and Aromatic Compounds, in Vol. 8 (ed. H.J.Schäfer) of Encyclopedia of Electrochemistry (eds. A.J. Bard, M. Stratmann) Wiley-VCh, 2004, 125 – 169.

• T. Fuchigami, T. Nonaka, H.J. Schäfer, Selectivity in Electrochemical Reactions, in Vol. 8 (ed. H.J. Schäfer) of Encyclopedia of Electrochemistry (eds. A.J. Bard, M. Stratmann) Wiley-VCh, 2004, 399- 450.

• M. Schämann, H.J. Schäfer, Alkoxyamines by reaction of 2,2,6,6-Tetramethylpiperidine-1-oxoammonium Tetrafluoroborate with Enolates, Synlett 2004, 1601-1603.

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2003

• J. Heimann, H.J. Schäfer, R. Fröhlich, B. Wibbeling, Cathodic Cyclisation of N-(Oxoalkyl)pyridinium Salts - Formation of Tricyclic Indolizidine and Quinolizidine Derivatives in Aqueous Medium, Eur. J. Org. Chem., 2003,2919-2932.

• C. Möllers, J. Prigge, B. Wibbeling, R. Fröhlich, A. Brockmeyer, H.J. Schäfer, E. Schmälzin, C. Bräuchle, K. Meerholz, E.-U. Würthwein, Polyamino-Substituted 1-Oxa-3,5-diazahexatrienes and 1-Oxa-3,5,7-triazaoctatetraenes (N-Acyl-Ologocyanamides): Synthesis, Structures, Cyclovoltammetry and NLO Properties - Experiment and Theory, Eur. J. Org. Chem., 2003, 1198-1208.

• U.-St.Bäumer, H.J. Schäfer, Cleavage of Olefinic Double Bonds by Mediated Anodic Oxidation, Electrochim. Acta 48, 2003, 489-495.

• M. Schämann, H.J. Schäfer, TEMPO-mediated Anodic Oxidation of MethylGglycosides, 1-Methyl- and 1-Azido Disaccharides, Eur. J. Org. Chem., 2003, 351-358.

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2002

• T. Küpper, H.J. Schäfer, Enantioselective Reduction of 3-Methylinden-1-one in the Presence of Chiral Catalysts, in: Organic Electrochemistry. Proceedings of the Fifth International Manuel M. Baizer Symposium in Honor of Professor Jean Michel Saveant. M. S. worketin, F. Maran, K. Chiba, Eds. 2002, Volume 10, 36-39. The Electrochemical Society, Ins., NY USA.

• K. Dreger, H.J. Schäfer, Assembly of New Amphiphiles with Amide Groups Incorporated into the Alkyl Chain at the Air-Water Interface, Materials Science and Engineering, C 22, Pisa, 2002, 327-330.

• T. Renkes, H.J. Schäfer, P.M. Siemens, E. Neumann, Antibacterial Properties of Ion Channel Forming Fatty Acid Oligo (Ethylene Glycol) Esters. Materials Science and Engineering, C 22, Pisa, 2002, 275-278.

• K. Bürger, H.J. Schäfer, Kathodische Kupplung von Carbonylverbindungen zu Pinakolen an der Graphit-Kathode, in: Elektronenübertragung in Chemie und Biochemie, Beiträge der Jahrestagung der GDCh-Fachgruppe, Angewandte Elektrochemie vom 26.-28. September 2001, GDCh-Monographie, Bd. 23, 2002, S. 259-266.

• J. C. Friese, H.J. Schäfer, Short Synthesis of a Taxan-AB-Fragment with a Spiro-Cyclopropyl Group.  Synlett 5 2002, 814-816.

• J. C. Friese, S. Krause, H.J. Schäfer, Formal Total Synthesis of the Trinorguaiane Sesquiterpenes (+/-)-Clavukerin A and (+/-)-Isoclavukerin.  Tetrahedron Letter 43 2002, 2683-2685.

• M. Overs, S. Jacobi, L.F. Chi, M. Fix, H. Fuchs, H.-J. Galla and H.J. Schäfer, Assembly of New Dioxygenated Alkyl Alkanoates at the Air-Water Interface.  Colloids and Surfaces A: Physicochem. Eng. Aspects, 2002, 198-200, 453-465.

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2001

• E.M. Belgsir, H.J. Schäfer, Selective Oxidation of Carbohydrates on Nafion-TEMPO-modified graphite felt  electrodes,   Electrochemistry Communications, 3 2001,  32-35.

• S. Kratschmer, H.J. Schäfer, R. Fröhlich,  Cathodically initiated cyclodimerization of trimethyl aconitate,  Journal of Electroanalytical Chemistry 2001, 2-10.

• H.J. Schäfer,  Electrochemistry in Radical Reactions in Radicals in Organic Synthesis  (P. Renaud, M.P Sibi, Edit.), Wiley-VCH, Weinheim, 2001.

• H.J. Schäfer,  Comparison between Electrochemical Reactions and Chemical Oxidation  and Reductions (Chapter 4) in Organic Electrochemistry, 4. Edition (H. Lund, M.M. Baizer, Edit.), Marcel Dekker, Inc., 2001.

•  H.J. Schäfer,  Electrolytic Oxidative Coupling (Chapter 22) in Organic Electrochemistry,  4. Edition (H. Lund, M.M. Baizer, Edit.), Marcel Dekker, Inc., 2001.

• G. Feldmann, H.J. Schäfer,  Fatty acids linked with dyes and corrosion inhibitors, Oléagineux Corps gras Lipides 8,  2001, 60-62.

• B. Koop, A. Straub, H.J. Schäfer,  Stereoselective oxidation of 4-aryl-1,4-dihydropyridines to axially chiral 4- arylpyridines with 2,2,6,6-tetramethyl-1-oxopiperidinium tetrafluoroborate  (TEMPO+BF4-), Tetrahedron: Asymmetry 12, 2001, 341-345.

• M. Dierker, H.J. Schäfer, Synthese und Eigenschaften polar substituierter Fettstoffe, in: Nachwachsende Rohstoffe für die Chemie – 7. Symposium Dresden 2001, Tagungsband, Landwirtschaftsverlag, Münster 2001, S. 668-673.

• C. Kalk, H.J. Schäfer, Fettstämmige Antioxidatien und Aminosäuren durch Oxidationen, Umlagerungen und Cycloadditionen, in: Nachwachsende Rohstoffe für die Chemie – 7. Symposium Dresden 2001, Tagungsband, Landwirtschaftsverlag, Münster 2001, S. 772-777.

• P.u Q. Nguyen, H.J. Schäfer, Enantioselective Oxidative Coupling of the Titanium Enolate of 3-Phenylacetyl-2-oxazolidinone, Organic Letters 3, 2001, 2993-2995.

• C.  Kalk, H.J. Schäfer, Antioxidants based on fatty acids, Oléagineux Corps gras Lipides 8, 2001, 89-91.

• D. Witthaut, R. Fröhlich, H.J. Schäfer, Heterocyclen durch Dominorekationen mit Aconitsäuretrimethylester, einem vielseitgen Synthesebaustein, Angew. Chem. 2001, 113, 4354-4356; Angew. Chem. Int. Ed. Engl. 40, 22 2001, 4212-4214.

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2000

• M. Fix, M. Sieber, M. Overs, H.J. Schäfer, H.-J. Galla, Temperature-dependent phase behaviour of dihydroxy octadecanoic acid methyl esters: Influence of stereochemistry and position of the second polar moiety, Phys. Chem. Chem. Phys. 2000, 2, 4515-4520.

• B. Koop, H.J. Schäfer, A. Straub, Stereoselective Interconversion of NADH and NADH+ Analogues by  Electrochemical Oxidation and Reduction Proceedings of the Electrochemical Society,  2000, 15, 124-127.

• M. Michman, M. Oron, H. J. Schäfer, Reaction of Aromatic Radical Cations with RuCl₃ - 3 H₂O, Collect. Czech. Chem. Commun. 2000, 65, 924-940.

• T. Renkes, H.J. Schäfer, P.M. Siemens, E. Neumann, Fettsäure-Oligoethylenglykolester bilden Ionenkanäle in Lipidmembranen,  Angw. Chem. 2000, 112, 2566-2570; Angw. Chem. Int Ed. Engl. 2000, 39, 2512-2516.

• U. Biermann, W. Friedt, S. Lang, W. Lühs, G. Machmüller, J.O. Metzger,  M. Rüsch gen. Klaas, H.J. Schäfer, M.P. Schneider, Neue Synthesen mit Ölen und Fetten als nachwachsende Rohstoffe für die  chemische Industrie, Angew. Chem. 2000, 112, 2292-2310; Angew. Chem. Int. Ed. Engl. 2000, 39, 2206-2224.

• L.F. Chi, S. Jacobi, B. Anczykowski, M. Overs, H.J. Schäfer, H. Fuchs, Supramolecular periodic structures in monolayers, Advanced Materials  2000, 12, 25-30.

• M. Overs, M. Fix, S. Jacobi, C. Löbbe, L.F. Chi, M. Sieber, H.J. Schäfer, H. Fuchs, H.-J. Galla, Asssembly of new vic-Dihydroxy Octadecanoic Acid Methyl Esters at the Air-Water Interface, Langmuir 2000, 16, 1141-1148.

• M. Overs, F. Hoffmann, H.J. Schäfer, H. Hühnerfuss, Infrared Reflection-Absorption Spectroscopy of Racemic and Enantioenriched   Methyl 17,18-dihydroxyoctadecanoate at the Air-Water Interface, Langmuir 2000, 16, 6995-6998.

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1999

• K. Schnatbaum, H.J. Schäfer, Electroorganic Synthesis 67: Selective Oxidation of Carbohydrates Mediated by TEMPO, Synthesis 1999, 5, 864-872.

• E.M. Belgsir and H.J. Schäfer, TEMPO-modified graphite felt electrodes: attempts on the enantioselective  oxidation of (rac)-1-phenylethanol in the presence of (-)-sparteine, Chemical Communications 1999, 435-436.

• C. Reufer, C. Zielinski, H.J. Schäfer and R. Fröhlich, Diastereoselective Cathodic Reduction of Phenylglyoxylic Acid Attached to Chiral Auxiliaries, Acta Chem. Scand. 1999, 53, 1023-1037.

• M.O.F. Goulart and H.J. Schäfer, Diastereomeric Amides Derived from Malonic Acid: the Role of Chiral Auxiliaries and of the Nature of Co-Acids in the Mixed Kolbe Electrolyses, J. Braz. Chem. Soc. 1999, 10, 153-162.

• H.J. Schäfer , M. Zobel, in Recent Developments in the Synthesis of Fatty Acid Derivatives, G. Knothe, J.T.P. Derksen, Ed., Palladium(0)-Catalyzed Reactions of Nucleophiles with Allyl Carbonates of Unsaturated Fatty Acids, AOCS Press, Champaign, Illinois, 1999, S. 59-79.

• L. Appelbaum, C. Heinrichs, J. Demtschuk, M. Michman, M. Oron, H.J. Schäfer, H. Schumann, Ru(CH₃CN)₃Cl₃, preparation and use as a mediator for the electrooxidation of hydrocarbons, Journal of Organometallic Chemistry 1999, 592, 240-250.

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1998

• A. Weiper-Idelmann, M. aus dem Kahmen, H.J. Schäfer, M. Gockeln, Anodic Homocoupling of Carboxylic Acids derived from Fatty Acids, Acta Chem. Scand. 1998, 52, 672-682.

• M. Plate, M. Overs, H.J. Schäfer, Synthesis of Enantioenriched Methyl vic - Dihydroxystearates,  Synthesis 1998,   1255 - 1258.

• M. aus dem Kahmen, H.J. Schäfer, Cycloadditions with unsaturated Fatty Acids,  Fat/Lipid 1998, 100(6), 227-235.

• S. Jacobi, L. Chi, M. Plate, M. Overs, H.J. Schäfer, H. Fuchs, Monolayer Studies of Enantioenriched Methyl vic-Dihydroxystearates, Thin Solid Films 1998, 327-329, 180-184.

• M. Plate, H.J. Schäfer und M. aus dem Kahmen, Anodische Additionen an Konjuenfettsäure - Methode, Produkte und deren  Eigenschaften, Schriftenreihe „Nachwachsende Rohstoffe Bd. 12", Chemische Nutzung  heimischer Pflanzenöle  - Abschlußkolloquium des BML, Landwirtschaftsverlag  Münster, 1998, S. 50. - 74.

• M. Zobel und H.J. Schäfer, Nukleophile Additionen und Substitutionen an ungesättigten Fettsäuren, Schriftenreihe „Nachwachsende Rohstoffe Bd. 12", Chemische Nutzung  heimischer Pflanzenöle - Abschlußkolloquium des BML, Landwirtschaftsverlag  Münster, 1998, S. 75 - 110.

• D. Fabritius und H.J. Schäfer, Mikrobielle w- und b-Oxidation von Fettsäuren, Schriftenreihe „Nachwachsende Rohstoffe Bd. 12", Chemische Nutzung  heimischer Pflanzenöle - Abschlußkolloquium des BML, Landwirtschaftsverlag  Münster, 1998, S. 111. - 140.

• D. Fabritius, H.J. Schäfer, A. Steinbüchel, Bioconversion of sunflower oil, rapeseed oil and ricinoleic acid by Candida tropicalis M25, Appl. Microbiol Biotechnol 1998, 50, 573-578.

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1997

• K. C. Möller, H. J. Schäfer, Anodic Oxidation of Cyclohexene: Dependence of the Product distribution on the reaction variables, Electrochim. Acta 1997, 42, 1971-1978.

• D. Fabritius, H. J. Schäfer, A. Steinbüchel, Biotransformation of linoleic acid with the Cadida tropicalis M25 mutant, Applied Microbiology and Biotechnology 1997, 48, 83-87.

• B. Klotz-Berendes, W. Kleemiß, U. Jegelka, H.J. Schäfer, S. Kotila, Enzymatic Synthesis of Optically Active Monoalkylated Malonic Monoesters, Tetrahedron, Asymmetry 1997, 8, 1821-1823.

• M. Zobel, H.J. Schäfer, Nukleophile Additionen an Ölsäure, 10-Undecensäure und Ricinolsäure, Tagungsband 5. Symposium Nachw. Rohstoffe 1997, Berlin, 186-190.

• M. Plate, H.J. Schäfer, Anodische Additionen von Alkoholen an Konjuenfettsäuremethylester, Tagungsband 5. Symposium Nachw. Rohstoffe 1997, Berlin, 195-198.

• M. Folmer Nielsen, B. Batanero, T. Löhl, H.J. Schäfer, Enantioselective Cathodic Reduction of 4-Methylcoumarine; Dependence of  Selectivity on Reaction Conditions and Investigation of the Mechanism, Chemistry Eur. J. 1997, 3, 2011-2024.

• H.J. Schäfer, S. Kratschmer, A. Weiper, E. Klocke, M. Plate, R. Maletz, Conversion of Biomass Derived Products by Anodic Activation, Novel Trends in Electroorganic Synthesis, S. Torii (Ed)., Springer-Verlag Tokyo, 1997, 187-190.

• M.F. Nielsen, B. Batanero, S. Rolvering, H.J. Schäfer, Enantioselective Cathodic Hydrogenation of Prostereogenic Activated Double  Bonds, Novel Trends in Electroorganic Synthesis,  S. Torii (Ed)., Springer-Verlag Tokyo, 1997, 229-232.

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1996

• M. Harenbrock, A. Matzeit, H. J. Schäfer, Anodic Heterocoupling (Mixed Kolbe Electrolysis) of Carbohydrate Carboxylic Acids with Alkanoic Acids to C-Glycosides, Liebigs Ann. 1996, 55-62.

• S. Lambrecht, H. J. Schäfer, R. Fröhlich, M. Grehl, A Highly Stereoselective Synthesis of a Tetrahydrofluorene via a Domino Claisen Rearrangement Hetero-Ene Reaction, Synlett 1996, 3, 283-284.

• D. Fabritius, H. J. Schäfer, A. Steinbüchel, Identification and production of 3-hydroxy-D9-cis-1,18-octadecenedioic acid by mutants of Candida tropicalis, Appl. Microbiol. Biotechnol. 1996, 45, 432-438.

• R. Maletz, L. Hinkamp, M. Zobel, M. aus dem Kahmen, H. J. Schäfer, Neue Oleochemikalien aus ungesättigten Fettsäuren durch CC-Verknüpfungsreaktionen in: Perspektiven nachwachsender Rohstoffe in der Chemie Ed. H. Eierdanz, VCH Weinheim, 1996, S. 259-262.

• K. Schnatbaum, H. J. Schäfer, Anodic Oxidation of Alcohols at the Nickel Hydroxide Electrode GDCh-Monographie, Bd. 3, 1996, S. 235-241.

• Katja Scharpwinkel, Stefan Matull, H. J. Schäfer, Enantioselective Addition of Lithium Trimethylsilyl Acetylide to Substituted Coclohexanones - Synthesis of Optically Active Tertiary Cyclohexanols, Tetrahedron Asymmetry 1996, 7, 2497-2500.

• R. Maletz, H. J. Schäfer, R. Quermann, Conversion of Unsaturated Fatty acids. - Nucleophilic additions to (E)-12-Oxo-10-octadecenoate, Fett/Lipid 1996, 98, 370-379.

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1995

• B. Klotz-Berendes, H.J. Schäfer, Diastereoselektive Kupplung anodisch erzeugter Radikale mit chiralen Amidgruppen, Angew. Chem. 1995, 107, 218-220; Angew. Chem. Int. Ed. Engl. 1995, 34, 189-190.

• S. Wiegand, H.J. Schäfer, Synthesis of the Salutaridine and Aporphine Skeleton via Palladium(O) Catalyzed Cyclization and S_RN1 Reaction of 2'-Bromoreticulines, Tetrahedron 1995, 51, 5341-5350.

• R. Gorny, H.J. Schäfer und R. Fröhlich, Diastereoselektive kathodische Cyclisierung von 1-(4- und 1-(3-Oxoalkyl)pyridinium-Salzen zu Chinolizidin- bzw. Indolizidin-Derivaten, Angew. Chem. Int. Ed. Engl. 1995, 34, 190-191.

• W. Thielemann, H.J. Schäfer and S. Kotila, A Facila Entry to the Taxane AB Ring System by Cyclopropyl-Carbinyl-Rearrangement of Tricyclo5.3.1.0^1,7undecanols, Tetrahedron 1995, 51, 12027-12034.

• A. Matzeit, H.J. Schäfer, C. Amatore, Radical Tandem Cyclizations by Anodic Decarboxylation of Carboxylic Acids, Synthesis1995, 11, 1433-1444.

• H.J. Schäfer, B. Klotz-Berendes, M. Letzel, C. Zielinski, N. Schoo, T. Löhl, and U. Höweler, Diastereoselective and Enantioselective Conversions at the Anode and the Cathode, Novel Trends in Electroorganic Synthesis, Kodansha, Tokyo 1995, 149-154.

• A. Matzeit and H.J. Schäfer, Radical Tandem Cyclizations, Novel Trends in Electroorganic Synthesis, Kodansha, Tokyo 1995, 303 - 310.

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1994

• J. Weiguny, H.J. Schäfer, Synthesis of Advanced Prostaglandine Precursors by Kolbe Electrolysis. I. Preparation of (1'R,4'S,3R/S)-3-(cis-4-Acetoxycyclopent-2-enyloxy)-3-ethoxypropionic Acid), Liebigs Ann. Chem. 1994, 225 - 233.

• J. Weiguny, H.J. Schäfer, Synthesis of Advanced Prostaglandine Precursors by Kolbe Electrolysis. - II. Preparation of Coacids and anodic initiated Tandem Radical-Addition/Radical-Coupling Reaction with (1'R,4'S,3R/S)-3-(cis-4-Acetoxycyclopent-2-enyloxy)-3-ethoxypropionic Acid), Liebigs Ann. Chem. 1994, 235 - 242.

• H. Riering, H. J. Schäfer, An Anode modified with immobilized Benzoquinone. - Part I. - Synthesis of substituted Benzoquinones, Chem. Ber. 1994, 127, 859 - 873.

• C. Zielinski and H. J. Schäfer, Diastereosective Cathodic Reduction of Chiral Phenylglyoxylamides Tetrahedron Lett. 1994, 35, 5621-5624.

• R. Multzsch, W. Lokotsch, B. Steffen, S. Lang, J.O. Metzger, H.J. Schäfer, S. Warwel, F. Wagner, "Enzymatic Production and Physicochemical Characterization of Uncommon Wax Esters and Monoglycerides", J. Amer. Oil Chem. Soc. 1994, 721-725.

• H.J. Schäfer, M. a.d. Kahmen, L. Hinkamp, R. Maletz, Neue Oleochemikalien aus ungesättigten Fettsäuren durch Cycloaddition, nukleophile Addition und anodische Oxidation, 3. Symposium Nachwachsende Rohstoffe - Perspektiven für die Chemie, Landwirtschaftsverlag Münster, 1994, 217 - 234.

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