TY  - JOUR
A1  - Koch, Andreas
A1  - Kleinpeter, Erich
T1  - Restricted rotation about particial C, N Double Bond
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Kleinpeter, Erich
T1  - The Structure of hydantions in solution and in the solid state
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Kleinpeter, Erich
A1  - Heydenreich, Matthias
A1  - Kalder, L.
A1  - Koch, Andreas
A1  - Henning, Dietrich
A1  - Kempter, Gerhard
A1  - Benassi, Rois
A1  - Taddei, F.
T1  - NMR spectroscopic and theoretical structural analysis of 5,5-disubstituted hydantoins in solution
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Banße, Wolfgang
A1  - Fliegner, Jana Ute
A1  - Hennig, H.
A1  - Lehmann, Andreas
A1  - Uhlemann, Erhard
A1  - Tschwatschal, F.
T1  - Ligand exchange reactions of molybdenum hexacarbonyl with tridentate diacidic ligands
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Berth, Gisela
A1  - Dautzenberg, Herbert
A1  - Peter, Martin G.
T1  - Physica-chemical characterization of chitosans in dilute solution
Y1  - 1998
SN  - 2-907922-57-2
ER  - 
TY  - JOUR
A1  - Yenesew, Abiy
A1  - Midiwo, Jacob O.
A1  - Meisner, M.
A1  - Heydenreich, Matthias
A1  - Peter, Martin G.
T1  - Two prenylated flavanones from stem bark of erythrina burttii
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Yenesew, Abiy
A1  - Midiwo, Jacob O.
A1  - Heydenreich, Matthias
A1  - Peter, Martin G.
T1  - Four isoflavanones from stem bark of erythrina sacleuxii
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Koetz, Joachim
A1  - Plantenberg, Thomas
T1  - Self-assembled polyanion-polycation systems
Y1  - 1998
SN  - 0-9585708-1-7
ER  - 
TY  - JOUR
A1  - Berth, Gisela
A1  - Dautzenberg, Herbert
A1  - Peter, Martin G.
T1  - Physico-chemical characterization of chitosans varying in degree of acetylation
Y1  - 1998
SN  - 0144-8617
ER  - 
TY  - JOUR
A1  - Struszczyk, Marcin Henryk
A1  - Loth, Fritz
A1  - Köhler, L. A.
A1  - Peter, Martin G.
T1  - Characterization of chitosan
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Struszczyk, Marcin Henryk
A1  - Loth, Fritz
A1  - Peter, Martin G.
T1  - Analysis of deacetylation deree in chitosans from various sources
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Friedrich, Alwin
A1  - Hefele, Heike
A1  - Mickler, Wulfhard
A1  - Mönner, Anke
A1  - Uhlemann, Erhard
A1  - Scholz, F.
T1  - Voltammetric and potentiometric studies on the stability of vanadium(IV) complexes : a comparision of sulution phase voltammetry with the voltammetry of the microcrystalline solid compounds
Y1  - 1998
ER  - 
TY  - THES
A1  - Wu, Yuling
T1  - Syntheses of defined carbohydrate surfactants and determination of their wetting behaviour under equilibrium and dynamic conditions
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Mickler, Wulfhard
A1  - Mönner, Anke
A1  - Uhlemann, Erhard
T1  - Electrochemical studies on the stability of copper ß-diketone chelates
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Struszczyk, Marcin Henryk
A1  - Loth, Fritz
A1  - Peter, Martin G.
T1  - Calibration of methods for the determination of the degree of decatetylation of chitosan
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Mickler, Wulfhard
A1  - Reich, Annett
A1  - Uhlemann, Erhard
T1  - Extraction of iron (II) and iron (III) with 4-acylpyrazolones in comparision with long chain 1-phenyl-1,3- (cyclo)alkanediones
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Cierpiszewski, Ryszard
A1  - Rusinska-Roszak, D.
A1  - Szymanowski, Jan
A1  - Mickler, Wulfhard
A1  - Uhlemann, Erhard
T1  - Rate of coper extraction and structure of model ß-diketones and 4-acyl-5-pyrazolones
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Koetz, Joachim
A1  - Kosmella, Sabine
T1  - Polyelectrolyte complex formation with chitosan
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Kosmella, Sabine
A1  - Koetz, Joachim
A1  - Shirahama, K.
A1  - Liu, J.
T1  - The cooperative nature of complex formation in mixed polyelectrolyte-surfactant systems
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Streffer, Katrin
A1  - Kaatz, Helvi
A1  - Bauer, Christian G.
A1  - Makower, Alexander
A1  - Schulmeister, Thomas
A1  - Scheller, Frieder W.
A1  - Peter, Martin G.
A1  - Wollenberger, Ursula
T1  - Application of a sensitive catechol detector for determination of tyrosinase inhibitors
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Alarcon, Julio
A1  - Alderete, Joel B.
A1  - Peter, Martin G.
A1  - Becerra, Juan J.
A1  - Silva, M.
T1  - Study on synthesis of 3 alpha,4 alpha-dihydroxy-dihydro-beta-agarofuran
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Mahapatra, Susanta
A1  - Vetter, Reinhard
A1  - Zuhrt, Christian
A1  - Nguyen, Huu Tong
A1  - Ritschel, Thomas
A1  - Zülicke, Lutz
T1  - Ground state potential energy surface, 3D time-dependent intramolecular dynamics and vibrational states of the N2H+ molecular ion
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Kallies, Bernd
A1  - Mitzner, Rolf
T1  - Models of water-assisted hydrolyses of methyl formate, formamide, and urea from combined DFT-SCRF calculations
N2  - In this work we present theoretical studies of the hydrolytic reaction of methyl formate, formamide and urea with one water molecule. The studied systems contain two additional water molecules which can act as bifunctional acid- base catalysts. These water molecules catalyze proton transfers between the primary reacting species. Our models describe the concerted transfer of two protons in every reaction step. The calculations have been carried out with the Becke3LYP/6-31G* method. Unspecific solvation effects have been included by means of a polarizable continuum model. Substrate reactivity differences as well as preferences for different reaction pathways can be discussed with the aid of these molecular systems. The studied alternative mechanisms include the common addition-elimination mechanism via a tetrahedral intermediate, and a concerted SN-like mechanism without a reaction intermediate. Our results suggest that the proved decreasing substrate reactivity in the order ester, amide, urea is caused by a rising resonance stabilization of the reaction centre, and not by a different positive partial charge of the carbonyl carbon. It is also concluded, that the probability of a concerted addition of a nucleophile and elimination of a leaving group without a tetrahedral intermediate rises in the order ester, amide, urea. The ordering of reactivity is not influenced by this behaviour.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Beitz, Toralf
A1  - Bechmann, Wolfgang
A1  - Mitzner, Rolf
T1  - Investigations of reactions of selected Azaarenes with radicals in water, 2. Chlorine and Bromine radicals
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Kallies, Bernd
A1  - Mitzner, Rolf
T1  - Structural Properties of Protonated Acyl Derivatives as Studied by Quantum Mechanics
N2  - Basicities of 16 acyl compounds including selected aldehydes, ketones, esters, amides and ureas in the gas phase and in water were calculated with the Becke3LYP/6-31G* method. Solvent effects were modeled using a polarizable electrostatic continuum representation of the solvent. The properties of the electron densities of protonated molecules were described by localized bond orbitals. Our results suggest that the carbonyl oxygen is the preferred site of protonation for all molecules studied. Calculated pKa values in water range from -12 for aldehydes to + 1.5 for ureas. They agree well with published experimental data. We found that a high basicity of acyl compounds at the carbonyl oxygen is coupled with a large amount of additional resonance stabilization at the carbonyl group. The protonation of the leaving group of eaters, amides and ureas is less preferred, but the basicity difference between C=O and -OR or -NR2 decreases from esters to ureas. Calculated pKa values for this site range from -18 for esters to + 3 for ureas. These values are often not accessible by experiment. The structure of carboxylic acid derivatives protonated at the leaving group is determined by prefragmentation of the molecules into an acylium ion or positively charged isocyanate and an alcohol or amine. (C) 1998 Elsevier Science B.V.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Beitz, Toralf
A1  - Bechmann, Wolfgang
A1  - Mitzner, Rolf
T1  - Investigations of reactions of selected Azaarenes with radicals in water, 1. Hydroxyl and sulfate radicals
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Benassi, Rois
A1  - Bregulla, Antje
A1  - Friedrich, Alwin
A1  - Henning, Dietrich
A1  - Heydenreich, Matthias
A1  - Mickler, Wulfhard
A1  - Kleinpeter, Erich
A1  - Kempter, Gerhard
A1  - Schilde, Uwe
A1  - Taddei, F.
T1  - NMR spectroscopic and theoretical structural study of 5-exo-methylene-substituted hydantoins
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Reiche, K. B.
A1  - Starke, Ines
A1  - Kleinpeter, Erich
A1  - Holdt, Hans-Jürgen
T1  - Host-guest complexation of imine-type meta-bridged bis(benzo crown ether)s with alkali cations in the gas phase under FAB conditions
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Kleinpeter, Erich
A1  - Heydenreich, Matthias
A1  - Woller, Jochen
A1  - Wolf, Gunter
A1  - Koch, Andreas
A1  - Kempter, Gerhard
A1  - Pihlaja, Kalevi
T1  - Configuration and stereodynamics of exo/endoisomeric push-pull alkenes of pentadiene structure
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Hilfert, Liane
A1  - Sarodnick, Gerhard
A1  - Kempter, Gerhard
A1  - Kleinpeter, Erich
T1  - 1H, 13C and 15 N NMR study and molecular modelling of 2,3- disubstituted quinoxalines with sterically hinderered aromatic and heteroaromatic substituents
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Kleinpeter, Erich
T1  - Conformational analysis of saturated six-membered oxygen-containing heterocyclic rings
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Heydenreich, Matthias
A1  - Koch, Andreas
A1  - Ristau, Thomas
A1  - Knoll, Susanne
A1  - Heinicke, Jochen
A1  - Sieler, Joachim
A1  - Niemitz, Matthias
A1  - Mühlstädt, Manfred
A1  - Kleinpeter, Erich
T1  - Conformational analysis of sulfur-containing heterocycles ; part I: synthesis and structural determination of diastereomerically pure 4,6-bis(phenoxymethyl)-1,2,5-trithiepanes
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Bechthold, Nina
A1  - Tiersch, Brigitte
A1  - Koetz, Joachim
A1  - Friberg, Stig E.
T1  - Structure Formation in polymer-modified liquid crystals
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Koetz, Joachim
A1  - Beitz, Toralf
A1  - Tiersch, Brigitte
T1  - Self assembled polymer-surfactant systems
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Rottmann, Antje
A1  - Synstad, Bjoenar
A1  - Eijsink, Vincent G. H.
A1  - Peter, Martin G.
T1  - Synthesis of N-acetylglucosaminyl and diacetylchitobiosyl amides of heterocyclic carboxylic acids as potential chitinase inhibitors
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Struszczyk, Marcin Henryk
A1  - Halweg, R.
A1  - Peter, Martin G.
T1  - Comparative analysis of chitosans from insects and crustacea
Y1  - 1999
SN  - 3-9806494-5-8
ER  - 
TY  - JOUR
A1  - Letzel, Matthias C.
A1  - Synstad, Bjoenar
A1  - Eijsink, Vincent G. H.
A1  - Peter-Katalinic, Jasna
A1  - Peter, Martin G.
T1  - Libraries of chito-oligosaccharides of mixed acetylation patterns and their interactions with chitinases
Y1  - 1999
SN  - 3-9806494-5-8
ER  - 
TY  - JOUR
A1  - Koetz, Joachim
A1  - Kosmella, Sabine
T1  - Polymers in lyotropic liquid crystals
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Koetz, Joachim
T1  - Interactions between charged colloids and polyelectrolytes (invited lecture)
Y1  - 1999
SN  - 0-89852- 748-1
ER  - 
TY  - JOUR
A1  - Struszczyk, Marcin Henryk
A1  - Loth, Fritz
A1  - Peter, Martin G.
T1  - Preparation of paper sheets containing microcrystalline chitosan
Y1  - 1999
SN  - 3-9806494-5-8
ER  - 
TY  - JOUR
A1  - Struszczyk, Marcin Henryk
A1  - Loth, Fritz
A1  - Peter, Martin G.
T1  - Method of microcrystalline chitosan-protein films preparation
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Mickler, Wulfhard
T1  - Reactive Liquid-Liquid-Extraction of heavy metals from Landfill Leachate
Y1  - 1999
SN  - 3-924763-80-1
ER  - 
TY  - JOUR
A1  - Mickler, Wulfhard
A1  - Mönner, Anke
A1  - Uhlemann, Erhard
A1  - Wilke, S.
A1  - Müller, H.
T1  - Transfer of ß-diketone and 4-acylpyrazolone anions across the electrified water nitrobenzene interface
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Zuhrt, Christian
A1  - Neumann, Rainer
A1  - Zülicke, Lutz
T1  - Investigation of vibrational states of the ArHCl+ cation in the electronic ground state
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Kaatz, Helvi
A1  - Streffer, Katrin
A1  - Wollenberger, Ursula
A1  - Peter, Martin G.
T1  - Inhibition of mushroom tyrosinase by kojic acid octanoates
Y1  - 1999
ER  - 
TY  - THES
A1  - Netz, Roland R.
T1  - Field-theoretic approaches to clasical charged systems
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Kosmella, Sabine
A1  - Koetz, Joachim
A1  - Shirahama, K.
T1  - Binding of dodecylpyridinium chloride to anionic co-polymers and their complexes
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Beitz, Toralf
A1  - Koetz, Joachim
A1  - Friberg, Stig E.
T1  - Polymer-modified ionic microemulsion formed in the system SDS/Water/Xylene/Pentanol
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Beyermann, Jochen
A1  - Koetz, Joachim
A1  - Jäger, Werner
A1  - Friberg, Stig E.
T1  - Influence of charge density of anionic polyelectrolytes on structure formation in liquid crystalline systems
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Kamlage, Stefan
A1  - Sefkow, Michael
A1  - Peter, Martin G.
T1  - Cross coupling of benzylic bromides and vinyl stannanes
Y1  - 1999
ER  -