J. Serb. Chem. Soc. 62(5) 389-392 (1997)
JSCS-2397
UDK
547.473:542.913:543.9
Original
scientific paper
The synthesis and biological activity of
6-dichloromethyl-6-methyl-10-oxa-2-aza-bicyclo[5.3.0]dec-4-ene-3,9-dione,
lactamic g-lactone
SLOBODAN SUKDOLAK, SLAVICA SOLUJIC and GORDANA STOJANOVIC*
Department of Chemistry, Faculty of Science, University of
Kragujevac, P.O.Box 60, YU-34000 Kragujevac and
*Department of Chemistry, Faculty of
Philosophy, University of Nis, Cirila i Metodija 2, YU-18000 Nis, Yugoslavia
(Received
20 September 1996, revised 31 January 1997)
Lactamic y-lactone, 4 has been
synthesized by a Beckmann rearrangement of a mixture of the corresponding (E)-
and (Z)-oximes, 2 and 3, derived from trans-3H,3a,7aH-4-dichloromethyl-4-methyl-
benzofuran-2,7-dione. The antibacterial and antifungal activities of the title
compound have also been investigated.
Key
words: g-lacone, beckmann rearrangement, biological activity, synthesis,
oximes
J. Serb. Chem. Soc. 62(5) 393-395 (1997)
JSCS-2398
UDK
547.455.643:547.81:66.096
Short
Communication
SHORT COMMUNICATION
Conversion of d-glucose to methyl a-d-altropyranoside derivatives
EVGENIJA CURENDIC, SMILJANA VELIMIROVIC, MIRJANA POPSAVIN,
VELIMIR POPSAVIN and DUSAN MILJKOVIC
Institute of Chemistry, Faculty of Science, University of Novi
Sad, Trg Dositeja Obradovica 3, YU 21 000 Novi Sad, Yugoslavia
(Received
11 October 1996, revised 8 February 1997)
A novel synthesis of methyl a-d-altropyranoside derivatives 5 and 6 has been
achieved starting from methyl a-d-glucopyranoside (1). The action of
tosyl chloride in pyridine on compound 1 afforded the 2,6-di-O-tosyl
derivative 2 which was further treated with sodium acetate in N.N-dimethylformamide
to give the 6-D-acetyl derivate 3. Treatment of 3 with aqueuos
potasiium hydroxide give the methyl a-D-altropyranoside
(5) which was subsequently acetylated to afford the corresponding
peracetylated derivative 6.
Key
words: d-altrose, a-d-glucopyranoside,
partial tosylation, solvolysis
J. Serb. Chem. Soc. 62(5) 397-401 (1997)
JSCS-2399
UDK
547.677.5+547.461.3+546.72/541.486
Original
scientific paper
A mixed-valence complex of iron with 1,10-phenanthroline and the
malonate ion
DJORDJE STOJAKOVIC and MAJA FERTILIO-TOMASEVIC
Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, P.O.Box
494, YU-11001 Belgrade, Yugoslavia
(Received
23 October 1997)
The synthesis of a mixed-valence complex in
the ternary system Fe-phen-mal [phen=1,10-phenanthroline, mal=malonate(2-)ion]
is reported. Based on elemental analysis. UV-vis spectroscopy. IR spectroscopy
and magnetic susceptibility measurements, the formula [FeII(phen)3]2 [phen)2FeII(mal)2FeIII(OH)(H2O)(mal)2FeII(phen)2](mal)-46H2O
is proposed for the compound. All the Fe(II) sites are diamagnetic (t2g6 configuration), while the Fe(III) site is paramagnetic (t2g3eg2). TG analysis shows
that two thirds of the water content leave the system by 105°C, the remaining
one third by 209°C, and the malonate ions are lost by 277°C.
Key
words: iron complexes, mixed-valence compounds, polynuclear complexes,
1,10-phenanthroline, malonic acid
J. Serb. Chem. Soc. 62(5) 403-408 (1997)
JSCS-2400
UDK
546.733:541.428:547.476.3/.6
Original
scientific paper
Mixed cobalt(III) complexes with
1,4,8,11-tetraazacyclotetradecane (cyclam) and a,w-dicarboxylato ligands
ZORAN MIODRAGOVIC, GORDANA VUCKVOIC, PETAR RADIVOJSA and VUKADIN
LEOVAC*
Faculty of Chemistry, University of Belgrade, Akademski trg, P.O.Box 158, YU-11001
Belgrade, Yugoslavia
*Institute of Chemistry, Faculty of
Science, University of Novi Sad, Trg Dositeja Obradovica 3, YU 21 000 Novi Sad, Yugoslavia
(Received
20 September, revised 14 November 1996)
By direct reaction, four mixed mononuclear
cobalt(III) complexes with 1,4,8,11-tetraazacyclotetradecane (cyclam) and
dicarboxylato ligands (dic: malonato, succinato, glutarato, and adipato ions),
of the general formula [Co(dic)(cyclam)]ClO4 were obtained. It has been postulated that the geometry of all
complexes is a deformed octahedron with the cyclam in a folded configuration
and the bidentate dicarboxylate in the cis position bound through the two
oxygen atoms of both carboxylic groups. For the glutarato-and adipato-complexes
the supposed structure is an eight- and nine-membered chelate ring,
respectively. the complexes were characterized by elemental analysis,
ion-exchange chromartography, as well as electronic and IR spectroscopy.
Key
words: cobalt(III) complexes, cyclam, a,w-dicarboxylato
ligands
J. Serb. Chem. Soc. 62(5) 409-415 (1997)
JSCS-2401
UDK
547.313:549.67:66.097.3/.5
Original
scientific paper
Homologation: the pathway of olefine conversion over pentasil
zeolites
BORIVOJ ADNACEVIC and LAV AGABALYAN*
Faculty of Physical Chemistry, University of Belgrade,
Studentski trg 12-16, P.O.Box 137, YU-11001
Belgrade, and
Institute of General and Physical
Chemistry, Studentski trg 12-16,
P.O.Box 551, YU-11001 Belgrade and
*CETA, Serpukhovskoy val 24, ? Moscow,
Russia
(Received
9 September 1994, revised 21 December 1996)
Catalytic conversion of low concentration
of gaseous mixtures of various alkenes in He over NiS modified zeolite of
pentasil type was studied. Based on the established changes in the distribution
of the products of catalytic conversion of alkene with a change in the reaction
temperature and the concentration of alkene, benzene and CH3I in gas mixture, the
model of the mechanism of catalytic conversion of alkene on zeolite catalyst
was proposed. According to the model, the catalytic conversion, depending on
reaction conditions, develops in three stages. In the first stage the
transformation alkene fragments (cracks) and forms the so-called C1-intermediate particles.
The formed C1-intermediate particles interact with the alkenes present in the
reaction system by homologation reactions (the second stage of the
transformation) which results in the growth of the carbon chain of the initial
alkene. At high concentrations of the initial alkene, newly formed alkenes of
relatively high molecular mass undergo disproportionation (the third stage of
the transformation). The presumed model completely explains the changes
appearing in the distribution of the products of catalytic conversion of alkene
on the studies zeolite, under the influence of the changes in the reaction
temperature and the concentration of alkene CH3I, and benzene in the
gaseous mixture.
Key
words: homologation, catalytic conversion, olefine, zeolite
disproportionation
J. Serb. Chem. Soc. 62(5) 417-422 (1997)
JSCS-2402
UDK
542.63:547.631.4:547.915.5-62-278
Original
scientific paper
Diffusion of dimenhydrinate through artificial lipid membranes
NEBOJSA CVETKOVIC, DRAGICA POPADIC, ALEKSANDRA PEJCIC and
MIROSLAVA NESIC
ICN Galenika - Institute, 29. Novembra 111, YU-11000 Belgrade,
Yugoslavia
(Received
30 September 1996, revised 17 January 1997)
The solubility of dimenhydrnate was
determined in solutions which simulated biological media, such as artificial
gastric and intestinal juices. Starting from these media, diffusion was
monitored through artificial lipid, artificial gastric and artificial
intestinal membranes. It was found that the solubility of dimenhydrinate was
higher in artificial gastric than in artificial intestinal juice and that the
diffusion rate through an artificial intestinal membrane was in the initial
period higher than that through an artificial gastric membrane.
Key
words: dimenhydrinate, solubility, diffusion, partition, coefficient,
artificial gastric juice, artificial gastric membrane, artificial intestinal
juice, artificial intestinal membrane
J. Serb. Chem. Soc. 62(5) 423-431 (1997)
JSCS-2403
UDK
541.138.3:541.135.52/546.49/:547.633.4
Original
scientific paper
Investigation of hydroxytriphenylmethane: Erichrome cyanine R
reduction at a mercury electrode
DESANKA SUZNJEVIC, STEVAN BLAGOJEVIC, MILENKO ERCEG* and DRAGICA
DUMANOVIC**
Institute of General and Physical Chemistry, Studentski trg 12-16,
P.O.Box 551, YU-11000 Belgrade and
*Forensic Institute, Kraljice Ane bb,
YU-11000 Belgrade and
**ICN Galenika - Institute, 29. Novembra
111, YU-11000 Belgrade, Yugoslavia
(Received
20 September, revised 2 December 1996)
Eriochrome cyanine R (ECR) reduction at
dropping mercury electrode, DME, produced two main waves A and B in direct
current (dc) and differential pulse (dp) polarography from aqueous solution of
pH 1.6 to 14. Only one wave was observed at higher acidity (Ho-3.63). The half-wave
potential, or peak symmetry potential, of the waves A and B, from acetate
buffer pH 4.8, were -0.45 V and -1.0 V, respectively. These waves belong to the
same redox process. The wave at -0.45 V is predominantly diffusion controlled,
while the wave at -1.00 V is adsorptive in nature. by applying cyclic
voltammetry (cv) using a mercury pool electrode, only one pair of peaks was
noticed belonging to a reversible two-electron diffusion controlled redox
process of the quinone moiety reduction with the consumption of two protons.
This pair corresponds to the polarographic wave observed at -0.45 V (wave A).
The second wave was absent from the cv curves most probably due to the presence
of a great capacitive current at the potential of the appearance of wave B.
Key
words: eriochrome cyanine R, mercury electrode, polarography, cyclic
voltammetry, reduction scheme
J. Serb. Chem. Soc.
62(5) 433-442 (1997)
JSCS-2404
UDK
541.18.041.5:625.731.7/88
Original
scientific paper
The effect of deposition process exchange current density on the
thin metal film formation on inert substrate
K. I. POPOV, B. N. GRGUR, E. R. STOJILJKOVIC*, M. G. PAVLOVIC**
and N. D. NIKOLIC**
Faculty of Technology and Metallurgy, Karnegijeva 4, P.O.Box
494, YU-11001 Belgrade,
*Faculty of Agriculture, YU-11080 Zemun,
Belgrade and
**ICTM - Institute of Electrochemistry,
Njegoseva 12, P.O.Box 815,
YU-11001 Belgrade, Yugoslavia
(Received
27 June 1996, revised 14 February 1997)
The initial stage of thin surface metal
film formation on inert substrate is considered. The simultaneous action of
both active centers and nucleation exclusion zones was taken into consideration
when discussing the saturation nucleation exclusion zones was taken into
consideration when discussing the saturation nucleus density. The saturation
nucleus density increases with increasing number of active centers and
decreasing the radii of nucleation exclusion zones (enhancing the thin metal
film formation). Atone at the same deposition current density deposition
overpotential increases with decreasing deposition process exchange current
density, leading to the increase in the number of active centers and to
decrease of crystallization overpotential and radii of nucleation exclusion
zones. Because of this compact surface metal film will be formed at a lower
quantity of electrodeposited metal with a decrease in exchange current density.
Key
words: metal electrodeposition, surface metal film formation, thin metal
film formation
J. Serb. Chem. Soc. 62(5) 443-449 (1997)
JSCS-2405
UDK
546.59:548.026:548.026:548.5/.512
Original
scientific paper
Island growth of Au on Au(110)
SVETLANA STRBAC and ZLATKO RAKOCEVIC*
ICTM - Institute of Electrochemistry, Njegoseva 12, P.O.Box 815,
YU-11001 Belgrade and
*Vinca Institute of Nuclear Science,
P.O.Box 522, YU-11001 Belgrade, Yugoslavia
(Received
16 December 1996)
The growth of Au on Au(110) single crystal
substrates has been observed by scanning tunneling microscopy (STM) in air with
a surface coverage by deposited gold atoms of up to 6 of a monolayer (ML). The
Au grows in the island growth mode on the Au(110) surface. The islands are
elongated along the [110] direction where the preferential diffusion of
incoming adatoms occurs. The coalescence of islands by bridging via kinks along
the [100] direction is the kinetic pathway to the growth of a 3D phase.
Key
words: gold, island growth, Au(110), scanning tunneling microscopy