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  - Struszczyk, Marcin Henryk
A1  - Loth, Fritz
A1  - Köhler, L. A.
A1  - Peter, Martin G.
T1  - Characterization of chitosan
Y1  - 1998
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  - 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  - 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  - Duvinage, Brigitte
T1  - Baustoffe
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Duvinage, Brigitte
T1  - Begriffe : Begriffsbildung
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  - 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  - 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  - 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  - Koetz, Joachim
A1  - Kosmella, Sabine
T1  - Polyelectrolyte complex formation with chitosan
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  - 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  - 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  - Schneider, Ingo
A1  - Mross, A.
A1  - Bechmann, Wolfgang
T1  - Der Einfluss einer permanenten Mineralölkohlenwasserstoff-Kontamination auf Bodenmikroorganismen in der Döberitzer Heide
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  - 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  - 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  -