POLISH JOURNAL OF CHEMISTRY
Volume 73 Number 4 April 1999
Pages 579-757


CONTENTS

Page

INORGANIC CHEMISTRY
579 Uptake of Molecular Oxygen by Co(II) Chelates with Peptides in an Aqueous Solution.
Part XI. Stereoselective Properties of Oxygenated Diastereoisomeric Dipeptide Systems

— Kufelnicki A. and Świątek M.
593 Phase Equilibria in a Portion of the System La2O3-BaO-P2O5 Rich in P2O5
— Znamierowska T. and Radomińska E.
599 Synthesis and Characterization of Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) Polychelates of the Schiff Base Derived from Dihydroxydibenzoyl Biphenyl and Butanedionedihydrazone
— Mohod R.B. and Aswar A.S.
607 Physico-Chemical Properties and X-ray Study of Trinuclear Carboxylate [Fe3O(CH3COO)6(H2O)3]2[PtCl6].8H2O
— Turta C., Shova S., Meriacre V., Cadelnic I.,
Gdaniec M., Simonov Yu.A. and Filoti G.
ORGANIC CHEMISTRY
619 Synthesis and Application of S-Glycofuranosyl O,O-Diethyl Phosphorodithioates
— Bogusiak J.
625 Molecular Structure of 5-Chloro-2-[p-t-butylphenyl]benzoxazole. Relation Between
Structure and Antimicrobial Activity of 2,5-Disubstituted Benzoxazoles

— Mrozek A.,
TrzeŸwińska H., Karolak-Wojciechowska J., Yalcin I. and Sener E.
635 Adamantanethione and Diazomethane; Dual Regiochemistry of Cycloadditions
— Huisgen R. and Mlostoń G.
PHYSICAL CHEMISTRY
645 Infrared Spectroscopic Study of Magnesium Oxide Catalysts Doped with Sodium Ions
— Ignaczak W., JóŸwiak W.K., Szubiakiewicz E. and Paryjczak T.
655 Comparison of the Ab-Initio Calculated and X-ray Molecular Geometries of the o-, m-, and
p-Cyanoaniline

— Janczak J.
669 Quantum Chemical Calculations on S-Centered 1,3-Dipoles. 1. Molecular and Electronic Structures of Thiocarbonyl S-Imides
— Fabian J. and Mlostoń G.
683 Quantum Chemical Calculations on S-Centered 1,3-Dipoles. 2. Reactivity of Thiocarbonyl
S-Imides in Pericyclic Reactions

— Mlostoń G. and Fabian J.
CRYSTAL AND MOLECULAR STRUCTURE
693 Crystal and Molecular Structures of Three Anxiolytic Pyrazolopyridines
— Kubicki M. and Codding P.W.
707 Crystal and Molecular Structures of 4-(1-Naphthyl)[2.2]paracyclophane and 4-{1-(2'-Methyl(naphthyl}[2.2]paracyclophane
— Jones P.G. and Kuœ P.
717 Crystal and Molecular Structures of Nickel(II) Complexes with Pyrazine-2,3-dicarboxylic and 3-Aminopyrazine-2-carboxylic Acids
— Ptasiewicz-Bšk H. and Leciejewicz J.
727 Crystal and Molecular Structure of 3-(2,4,6-Trimethylphenyl)-8-phenyl-oxo-1,7-dioxa-2-azaspiro[4.4]non-2-ene
— Anulewicz-Ostrowska R., Piętka E., Krygowski T.M., Micuch P. and Fisera L.
COMMUNICATIONS
735 The First Enzymatic Preparation of S-Chiral, Non-Racemic Sulfoximines
— Kiełbasiński P.
739 Potentiometric Studies on Ag(I) and Hg(II) Complexes with Aliphatic Amines in Water and Water-Methanol Solutions
— Czoik R. and John E.
743 Phase Equilibria in the AgGaTe2-HgTe and AgInTe2-HgTe Systems
— Galka V.O., Krykhovets O.V., Parasyuk O.V. and Olekseyuk I.D.
749 Preparation, Properties and Thermal Decomposition of Cd(II) Complexes with Isomers of Phthalic Acids
— Brzyska W. and Borkowska D.
753 Synthesis and Crystal Structure of [Cu(L)2](ClO4)2.H2O (L = 1,4,7-Triazacyclononane)
— Yan H.L., Zhang L., Yan S.P., Liao D.Z., Wang G.L., Yao X.K. and Wang H.G.
ERRATA
757 13C Kinetic Isotope Effects in the Decarboxylation of Phenylpropiolic Acid (PPA) Assisted with Formic Acid and 13C KIE in the Decarbonylation of Formic Acid in the Presence of PPA
— Zieliński M., Zielińska A., Paul H. and Papiernik-Zielińska H.


ABSTRACTS


579-592

Uptake of Molecular Oxygen by Co(II) Chelates
with Peptides in an Aqueous Solution. Part XI.
Stereoselective Properties of Oxygenated
Diastereoisomeric Dipeptide Systems

by A. Kufelnicki and M. Świąštek
Institute of Chemistry, Faculty of Pharmacy, Medical Academy of ŁódŸ,
ul. Muszyńskiego 1, 90-151 ŁódŸ, Poland

(Received October 12th, 1998; revised manuscript December 14th, 1998)

The reaction of oxygen uptake by Co(II) complexes with a group of diastereoisomeric dipeptides, consisting of alanine and leucine in various chiral forms, has been studied in an aqueous solution. The structure of the bridging moiety has been discussed on the basis of spectroscopic results (UV, Vis, near IR, CD, ESR). The effect of stereoselectivity has been confirmed by studies on reversibility of oxygenation. Comparative ESR measurements were done for mixed complexes with imidazole as N-base in the axial position. All of the results were compared with that for glycine dipeptides (containing only one asymmetric atom).

593-598

Phase Equilibria in a Portion of the System
La2O3-BaO-P2O5 Rich in P2O5

by T. Znamierowska and E. Radomińska
Department of Inorganic Chemistry, Faculty of Engineering and Economics,
Wrocław University of Economics, Komandorska 118/120, 53-345 Wrocław, Poland

(Received October 12th, 1998; revised manuscript December 31st, 1998)

The system LaPO4-Ba(PO3)2-LaP5O14, a part of the La2O3-BaO-P2O5 oxide system, has been investigated by differential thermal analysis, X-ray powder diffraction and microscopy in reflected light and its phase diagram was suggested. It was found that in the composition range under investigation, there occurs the quasi-binary section, i.e. La(PO3)3-Ba(PO3)2 only. Its phase diagram has been determined.

599-606

Synthesis and Characterization of Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) Polychelates of the Schiff Base Derived from Dihydroxydibenzoyl
Biphenyl and Butanedionedihydrazone

by R.B. Mohod and A.S. Aswar
Department of Chemistry, Amravati University, Amravati-444602 (M.S.), India

(Received July 22nd, 1998; revised manuscript January 4th, 1999)

New coordination polychelates of manganese(II), cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) with the Schiff base derived from 4,4'-dihydroxydibenzoyl biphenyl and 2,3-butanedionedihydrazone have been synthesized and characterized by elemental analysis, electronic and IR spectra, magnetic susceptibility, thermal analysis and D.C. electrical conductivity. The Schiff base behaves as a dibasic, tetradentate ligand coordinating through an ONNO system and forms chelates with general formula of [ML.xH2O]n (where x =1 or 2). The thermogravimetric studies indicate a two stage decomposition and the presence of water molecules. Using thermal decomposition data, different kinetic and thermodynamic parameters have also been evaluated. D.C. electrical conductivity was measured over a wide range of temperature in a pellet form. The Schiff base and its polychelates have also been tested for their antimicrobial activities.

607-618

Physico-Chemical Properties and X-ray Study
of Trinuclear Carboxylate [Fe3O(CH3COO)6(H2O)3]2[PtCl6]• 8H2O

by C. Turta1, S. Shova2, V. Meriacre1, I. Cadelnic2, M. Gdaniec3, Yu.A. Simonov2 and G. Filoti4
1Institute of Chemistry of the Academy of Sciences of Moldova, Academiei, 3, Kishinev 20-28, Moldova
2Institute of Applied Physics of the Academy of Sciences of Moldova,
Academiei, 5, Kishinev 20-28, Moldova
3A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
4National Institute of Physics and Material Technology, Bucharest, Romania

(Received October 7th, 1998; revised manuscript January 8th, 1999)

Trinuclear carboxylate compound [Fe3O(CH3COO)6(H2O)3]2[PtCl6]• 8H2O has been studied by Moessbauer spectroscopy, magnetochemistry, thermal analysis and X-ray crystallography. Crystal data: monoclinic, space group P21/n, a = 10.505(2), b = 14.278(3), c = 19.885(4) , = 96.00(3)° and Z = 2. The final R-value is 0.027 for 4606 reflections with I2(I). The crystal consists of the complex [Fe3O(CH3COO)6(H2O)3]+ cations, centrosymmetric [PtCl6]2- anions and water molecules. The [Fe3O(CH3COO)6(H2O)3]+ cation has the typical structure of a trinuclear iron(III) compound with µ3-O bridge. All crystal components are connected via a system of hydrogen bonds into a 3D network. Moessbauer spectrum displays at room temperature a single quadrupole doublet with an isomer shift of 0.70 mm/s and quadrupole splitting of 0.48 mm/s, consistent with high-spin Fe(III). µeff per Fe atom (3.25µB at 293 K and 2.23µBat 120 K), indicate the antiferromagnetic coupling between the paramagnetic iron ions with J = -31 cm-1.

619-624

Synthesis and Application
of S-Glycofuranosyl O,O-Diethyl Phosphorodithioates

by J. Bogusiak
Faculty of Pharmacy, Silesian Medical School, Jagiellońska 4, PL-41-200 Sosnowiec, Poland

(Received December 3rd, 1998; revised manuscript December 12th, 1998)

S-Glycosyl O,O-diethyl phosphorodithioates derivatives of L-arabino-, D-ribo- and D-xylofuranose can be conveniently prepared by treatment of reducing monosaccharides with tosyl chloride or diphenyl phosphorochloridate and diethyl phosphorodithioate under phase-transfer conditions. Their ability to act as glycosyl donors was demonstrated.

625-634

Molecular Structure of
5-Chloro-2-[p-t-butylphenyl]benzoxazole.
Relation Between Structure and Antimicrobial
Activity of 2,5-Disubstituted Benzoxazoles

by A. Mrozek1, H. TrzeŸwińska1, J. Karolak-Wojciechowska1,
I. Yalcin2 and E. Sener2
1Institute of General and Ecological Chemistry, Technical University of ŁódŸ,
90-924 ŁódŸ, Żwirki 36, Poland
2Ankara University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry,
06100 Ankara, Turkey

(Received July 30th, 1998; revised manuscript December 31st, 1998)

As part of our investigation on antimicrobial agents, the structure of 5-chloro-2-[p-t-butylphenyl]benzoxazole is reported: C17H16ClNO, mol. mass 285.77, monoclinic, space group: C2/c; a = 32.164(6) , b = 6.756(1) , c = 13.710(3) ; = 92.73(3)° V = 2975.8(10) 3; dx = 1.276 g cm-3; Z = 8; F(000) = 1200; µ(CuK) = 2.219 mm-1. Final R = 0.0658 for 2621 reflections with F > 4(F). Final atomic coordinates for this 2,5-disubstituted benzoxazole were used as a starting point in molecular modelling of remaining 32 derivatives searched as antimicrobial agents. Electronic parameters calculated with quantum chemistry methods and classical Hansch's constants were applied in searching for structure-activity correlation. It was established that geometrical para-
meters (area and volume) and LUMO energy values seem to be most important for the activity.

635-645

Adamantanethione and Diazomethane;
Dual Regiochemistry of Cycloadditions

by R. Huisgen and G. Mlostoń
Institut fuer Organische Chemie der Universitaet Muenchen, Karlstr. 23, D-80333 Muenchen, Germany

(Received November 12th, 1998; revised manuscript January 15th, 1999)

Cycloadditions of diazoalkanes to thiones take place in two directions furnishing 1,3,4-thiadiazolines and/or their 1,2,3-isomers, depending upon the substituents. Adamantanethione and diazomethane give rise to both regioisomers; a literature report on the high solvent dependence of the isomer ratio is confirmed, and the two regioisomers are isolated. The 1,3,4-thiadiazoline 20 eliminates N2 at 80°C (t1/2 55 s) in a 1,3-dipolar cycloreversion; the thiocarbonyl ylide 22 generated undergoes electrocyclization, forming a thiirane, or is intercepted by reactions with HX (thiols, alcohols) or dipolarophilic multiple bonds. The N2 extrusion from the isomeric 1,2,3-thiadiazoline 21 is at 80°C 600 times slower; the formation of the spirothiirane and homoadamantane-2-thione is explained by a diazonium thiolate as an intermediate.

645-654

Infrared Spectroscopic Study of Magnesium Oxide Catalysts Doped with Sodium Ions

by W. Ignaczak, W.K. Jóżwiak, E. Szubiakiewicz and T. Paryjczak
Institute of General and Ecological Chemistry, Technical University of ŁódŸ, 90-924 ŁódŸ, ul. Żwirki 36, Poland

(Received August 7th, 1998; revised manuscript December 23rd, 1998)

Infrared results concerning the surface species in MgO catalysts doped with Na+ ions are presented. Different surface carbonate structures and hydroxyls groups have been found. It was assumed that created carbonate compounds could be involved in decreasing of MgO specific surface area. Sodium carbonate and unidentate carbonate structures may cause elimination and blockage of low coordination sites of MgO surface, being responsible both for hydrogen detachment from CH4 molecules and for oxidation of methyl radicals to carbon oxides - the undesired reactions of oxidative coupling of methane (OCM). It was observed that increasing temperature led to decomposition of surface bicarbonate and unidentate carbonate structures. Some of them are being reconverted to more stable bicarbonate structures. Carbon dioxide and water desorptions result in gradual restoration of low coordinated sites of MgO, corresponding to high selectivity to C2 hydrocarbon formation. Sodium ions may also cause structural changes in MgO lattice. The catalysts were active and selective above 950 K for C2 hydrocarbon formation, although sodium carbonate is sufficiently stable under the conditions of the OCM process.

655-668

Comparison of the Ab-Initio Calculated and X-ray
Molecular Geometries of the o-, m-, and p-Cyanoaniline

by J. Janczak
W. Trzebiatowski Institute of Low Temperature and Structure Research,
Polish Academy of Science, 50-422 Wrocław, Okólna 2 str. P.O. Box 1410, Poland

(Received June 16th, 1998; revised manuscript December 28th, 1998)

Ab-initio gas-phase structure calculation of the geometry of three isomers of the cyanoaniline were determined using the Hartree-Fock level of theory. The optimized molecular structures have been compared with the in-crystal geometry of the molecules. The small differences in the bond lengths and angles were interpreted and analyzed in terms of the distribution of the charge density. The calculated charge density and its Laplacian function were analyzed in terms of the topological properties at the (3,-1) critical points (CPs) of the covalent and polar bonds. The effect of the donor-/acceptor functional groups attached to the phenyl ring is demonstrated especially in the location of the bond critical points and in the charge density at the bond critical points.

669-682

Quantum Chemical Calculations on S-Centered
1,3-Dipoles. 1. Molecular and Electronic Structures
of Thiocarbonyl S-Imides

by J. Fabian1 and G. Mlostoń2
1Technische Universitaet Dresden, Institut fuer Organische Chemie,
Mommenstr. 13, D-01062 Dresden, Germany, E-mail: fabian@coch01.chm.tu-dresden.de
2University of ŁódŸ, Department of Organic and Applied Chemistry,
Narutowicza 68, PL-90-136 ŁódŸ, Poland, E-mail: gmloston@krysia.uni.lodz.pl

(Received May 29th, 1998; revised manuscript January 4th, 1999)

Results of high level quantum chemical calculations on thiocarbonyl S-imides of type 4 are reported. Structure and properties of thioformaldehyde S-imide (4b) (CH2SNH) and its derivatives were calculated by DFT(B3LYP) in conjunction with 6-31+G(d,p) and 6-31+G(3df,3dp) basis sets. For the sake of comparison conventional ab initio quantum chemical calculations were also performed at MP2 and QCISD(T) levels. The calculated geometry and molecular properties of 4b are compared with those of closely related ylidic structures such as thioformaldehyde S-methylide (1, R1-R4 = H), thioformaldehyde S-oxide (2, R1-R2 = H), and thioformaldehyde S-sulfide (3, R1-R2 = H). Differently substituted thiocarbonyl S-imides 4d-i were calculated to show the effect of substitution on their molecular and electronic structure as well as on some physical properties. The parent compound 4b in the molecular ground state is predicted to be most stable in the planar and bent anti-conformation with geometric parameters and electronic characteristics of a predominantly ylidic structure. The IR and UV absorption maxima of 4b were calculated and discussed with respect to the expected structure of this reactive intermediate.

683-692

Quantum Chemical Calculations on S-Centered 1,3-Dipoles. 2. Reactivity of Thiocarbonyl S-Imides in Pericyclic Reactions

by G. Mlostoń1 and J. Fabian2
1University of ŁódŸ, Department of Organic and Applied Chemistry,
Narutowicza 68, PL-90-136 ŁódŸ, Poland, E-mail: gmloston@krysia.uni.lodz.pl
2Technische Universitaet Dresden, Institut fuer Organische Chemie, Mommenstr. 13, D-01062 Dresden, Germany, E-mail: fabian@coch01.chm.tu-dresden.de

(Received May 29th, 1998; revised manuscript January 4th, 1999)

Results of high level quantum chemical calculations on thiocarbonyl S-imides 1 are reported. The reactivity of thioformaldehyde S-imide (1a) (CH2S+NH-) in pericyclic reactions was calculated by density functional theory using gradient corrected functionals in conjunction with 6-31+G(d,p) and 6-31+G(3df,3dp) basis sets. For the sake of comparison, conventional ab intitio quantum chemical calculations at correlated levels of theory, such as MP2, QCISD(T) G1 and G2(MP2), were also performed. The predicted reactivity of the parent compound is compared with those of some closely related ylides (S-centered 1,3-dipoles), such as thioformaldehyde S-methylide (2a), thioformaldehyde S-oxide (3a) and thioformaldehyde S-sulfide (4a). To show the effect of substitution on structure and reactivity a series of acyclic and cyclic substituted thiocarbonyl S-imides 1b-k was calculated. The 1,3-electrocyclic ring closure of 1a to form thiaziridines 5 is predicted to be exothermic process by about 10 kcal/mol with activation energies of about 30 kcal/mol. The calculated reaction energies are considerably affected by higher angular momentum polarization functions, such as f-functions. In the case of some substituted thiocarbonyl S-imides, such as thiotropone S-imide (1i) and thiofluorenone S-imide (1j), the exothermicity of the ring closure reaction is lower than that of the parent compound. The concerted prototype [3+2]-cycloaddition of 1a with ethylene is strongly exothermic (about 50 kcal/mol) with the activation energy of about 20 kcal/mol. The energetics of both types of the pericyclic reactions of 1a appears closely related to that of 4a but differs more strongly from that of 3a. The contemporary knowledge on thiocarbonyl S-imides 1 is reviewed and discussed in conjunction with theoretical results.

693-706

Crystal and Molecular Structures of Three
Anxiolytic Pyrazolopyridines

by M. Kubicki1 and P.W. Codding2
1Department of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
2Department of Chemistry, University of Victoria, Victoria B.C., V8W 2Y2, Canada

(Received July 8th, 1998; revised manuscript October 26th, 1998)

The crystal structures of three pyrazolopyridines, ethyl 4-amino-6-ethyl-1-pentyl-1H-pyrazolo[3,4-b]pyridinium-5-oate chloride hydrate C16H25N4O2+ .Cl-.H2O (1), ethyl 4-amino-6-isopropyl-1-pentyl-1H-pyrazolo[3,4-b]pyridinium-5-oate chloride C17H27N4O2+.Cl- (2), and 4-amino-1-pentyl-1H-pyrazolo[3,4-b]pyridine-5-N-(2-propenyl)carboxamide C15H21N5O (3) have been determined by X-ray structure analysis of single crystals. The ethyl and isopropyl substituents in compounds 1 and 2, respectively, which are in ortho position relative to the ester group, cause a twist of the O=C-O-C plane with respect to the plane of pyrazolopyridine ring system. In the absence of that steric hindrance, in compound 3, the intramolecular N(amine)-H...O hydrogen bond closes the nearly planar six-membered ring. The coplanarity of the ester or amide plane with the plane of ring system is probably a necessary condition for the significant anxiolytic action. In both cations, the protonation takes place at the pyridine nitrogen atom. In the crystal structures of salts there are separate layers of anions and cations. In the free base, intermolecular hydrogen bonds make infinite chains of molecules.

707-716

Crystal and Molecular Structures of
4-(1-Naphthyl)[2.2]paracyclophane and
4-{1-(2'-Methyl)naphthyl}[2.2]paracyclophane

by P.G. Jones1 and P. Kuœ2
1Institut fuer Anorganische und Analytische Chemie, Technische Universitaet Braunschweig,
Postfach 3329, 38023 Braunschweig, Germany
2Department of Chemistry, Silesian University, 9, Szkolna Street, 40-006 Katowice, Poland

(Received November 12th, 1998)

The low-temperature crystal structures of 4-(1-naphthyl)[2.2]paracyclophane (1), C26H22, orthorhombic, Pca21, a = 15.860(3), b = 7.2871(14), c = 30.954(5) , Z = 8 (two independent molecules) and 4-{1-(2'-methyl)naphthyl}[2.2]paracyclophane (2), C27H24, monoclinic, P21/c, a = 8.0243(6), b = 14.8073(14), c = 16.239(2) , = 93.868(8)°, Z = 4 have been determined. In both compounds the conformations are such that the hydrogen at the naphthyl 8-position lies above the bridgehead atom C3 in (1) and points into the cyclophanyl cavity in (2) (the methyl group lies above the bridgehead atom C3). The interplanar angles between the naphthyl groups and the cyclophane rings, to which they are bonded, are 49.8 (49.1) and 55.5°, respectively.

717-726

Crystal and Molecular Structures of Nickel(II)
Complexes with Pyrazine-2,3-dicarboxylic and
3-Aminopyrazine-2-carboxylic Acids

by H. Ptasiewicz-Bšk and J. Leciejewicz
Institute of Nuclear Chemistry and Technology, ul.Dorodna 16, 03-195 Warszawa, Poland

(Received October 13th, 1998; revised manuscript December 21st, 1998)

Crystals of diaquobis(trans hydrogen pyrazine-2,3-dicarboxylato N,O)nickel(II) - title compound I, contain monomeric molecules. The nickel(II) ion is coordinated by two molecules of pyrazine-2,3-dicarboxylic acid, each donating its heteroring nitrogen [Ni-O 2.0485(15) ] and one oxygen atom, belonging to the nearest monodentate carboxylic group [Ni-O 2.0199(14) ]. Two water molecules [Ni-O 2.0914(17) ] complete the octahedral coordination around the central ion. The second carboxylic group and the heteroring nitrogen do not directly bond to the nickel(II) ion. Monomeric molecules of the composition Ni(II)(APZA)2(H2O)2 - title compound II, have been also found in the crystals of diaquobis(trans 3-amino-2-pyrazinecarboxylato O,N)nickel(II) compound. The coordination of the Ni ion is octahedral. (N,O) bonding moieties of two ligand molecules [Ni-O 2.0395(12) , Ni-N 2.0669(14) ] and the Ni ion are coplanar. The oxygen atoms donated by two water molecules [Ni-O 2.0656(14) ] constitute the vertices of the slightly elongated octahedron. The structures of both title compounds indicate a preference of nickel ion to form monomeric molecules. The monomeric molecules contain strong intramolecular hydrogen bonds. The stability of the crystals is maintained by a system of intermolecular hydrogen bonds.

727-734

Crystal and Molecular Structure of 3-(2,4,6-Trimethylphenyl)-8-phenyl-oxo-1,7-dioxa-2-azaspiro[4,4]non-2-ene

by R. Anulewicz-Ostrowska1, E. Piętka1, T.M. Krygowski1, P. Micuch2 and L. Fisera2
1Department of Chemistry, University of Warsaw, ul. Pasteura 1, 02-093 Warsaw, Poland
2Department of Organic Chemistry, Slovak Technical University, SK-812 37 Bratislava, Slovak Republic

(Received October 15th, 1998; revised manuscript December 24th, 1998)

Crystal and molecular structure of 3-(2,4,6-trimethylphenyl)-8-phenyl-oxo-1,7-dioxa-2-azaspiro[4,4]non-2-ene has been determined by X-ray diffraction technique. Crystal data for C21H21NO3: monoclinic, C2/c, a = 20.969(4) , b = 10.319(2) , c = 16.601(3) , = 97.5(3)°, Z = 8, R = 0.0658 for 3477 reflections. Contrary to the solution, in the crystalline state only one conformer exists.

735-738

The First Enzymatic Preparation of S-Chiral,
Non-Racemic Sulfoximines

by P. Kiełbasiński
Centre of Molecular and Macromolecular Studies, Department of Organic Sulfur Compounds,
Polish Academy of Sciences, 90-363 ŁódŸ, Sienkiewicza 112, Poland
E-mail: piokiel@bilbo.cbmm.lodz.pl

(Received December 3rd, 1998)

739-742

Potentiometric Studies on Ag(I) and Hg(II) Complexes with Aliphatic Amines in Water
and Water-Methanol Solutions

by R. Czoik and E. John
Institute of Chemistry, Silesian University, ul. Szkolna 9, 40-006 Katowice, Poland

(Received July 31st, 1998; revised manuscript December 24th, 1998)

743-748

Phase Equilibria in the AgGaTe2-HgTe
and AgInTe2-HgTe Systems

by V.O. Galka, O.V. Krykhovets, O.V. Parasyuk and I.D. Olekseyuk
Department of Inorganic and Physical Chemistry, Volyn State University,
Voli av. 13, Lutsk 263009 Ukraine; e-mail:oleg@lab.univer.lutsk.ua

(Received September 8th, 1998; revised manuscript January 5th, 1999)

749-752

Preparation, Properties and Thermal Decomposition
of Cd(II) Complexes with Isomers of Phthalic Acids

by W. Brzyska and D. Borkowska
Department of General Chemistry, Faculty of Chemistry, Marie Curie Skłodowska University,
20-031 Lublin, Poland

(Received October 22nd, 1998; revised manuscript January 6th, 1999)

753-756

Synthesis and Crystal Structure of [Cu(L)2](ClO4)2.H2O (L = 1,4,7-Triazacyclononane)

by H.-L. Yan1, L. Zhang1, S.-P. Yan1, D.-Z. Liao1, G.-L. Wang1,
X.-K. Yao2 and H.-G. Wang2
1Department of Chemistry, Nankai University, Tianjin, 300071, China
2Central Laboratory, Nankai University, Tianjin, 300071, China

(Received September 21st, 1998; revised manuscript January 12th, 1999)


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