JSCS Vol 67, No. 8-9
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J.Serb.Chem.Soc.
67(8–9)547–551(2002) |
To download this article click here 68 KB |
Regioselectivity of conjugate
additions to monoalkyl-1,4-benzoquinones
TATJANA BOZIC ,
DUSAN SLADIC, MARIO ZLATOVIC, IRENA NOVAKOVIC*, SNEZANA TRIFUNOVI and MIROSLAV
J. GASIC
Faculty of Chemistry, University of Belgrade, Studentski trg 16,
P. O. Box 158, YU-11001 Belgrade and
*ICTM Department of Chemistry, Njegoseva 12, P. O. Box 473,
YU-11001 Belgrade, Yugoslavia
(Received 22 March 2002)
The regioselectivity of the reaction of
conjugate addition of thiols, amines, methanol and hydrogen chloride with the
monoalkyl-1,4-benzoquinones avarone and 2-tert-butyl-1,4-benzoquinone was
investigated. It was shown that the regioselectivity of the reaction is
influenced by the electrophilicity of position 5 in unprotonated
2-alkylquinones, the increased electrophilicity of position 6 in acidic medium,
and by the acidity of the intermediate hydroquinones.
Keywords: quinone, avarone, conjugate
addition, regioselectivity.
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J.Serb.Chem.Soc.
67(8–9)553–566(2002) |
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Search for source rocks of the
crude oils of the Drmno depression (southern part of the Pannonian Basin,
Serbia)
B.
JOVANCICEVIC*,**1,2 , H. WEHNER***, G. SCHEEDER***, K. STOJANOVIC**,****, A. SAINOVIC*, O.
CVETKOVIC**, M. ERCEGOVAC***** and D. VITOROVIC**
*Faculty of Chemistry, University of Belgrade, P. O. Box 158,
YU-11001 Belgrade,
**ICTM-Center of Chemistry, P. O. Box 815, YU-11001 Belgrade,
***Federal Institute for Geosciences and Natural Resources, P. O.
Box 510153, Hannover, Germany,
****Department of Medicine, University of Belgrade, Visegradska
26, YU-11000 Belgrade and
*****Faculty of Mining and Geology, University of Belgrade,
Djusina 7, Belgrade, Serbia, Yugoslavia
(Received 11 April 2002)
Abstract: In a search for source rocks of the
crude oils of the Drmno depression (southern part of the Pannonian Basin,
Serbia), based on bulk and specific organic geochemical parameters, six out of
eight Sirakovo, Bubu{inac and Bradarac sedimentary core samples were found to
possess typical source rock characteristics. By comparing the results observed
for these sedimentary samples with the corresponding properties of the crude
oils from the Sirakovo and Bradarac oil-gas fields, a positive organic
geochemical oil-source rock correlation was experienced for the first time
within this basin. This finding may be considered as an important step towards
the ultimate organic geochemical/geological interpretation of the Drmno
depression.
Keywords: source rocks, crude oils, Drmno
depression, organic geochemical correlation, biological markers.
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J.Serb.Chem.Soc.
67 (8–9)567–572(2002) |
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Isolation and partial
characterization of an acid phosphatase from Artemisia vulgaris pollen extract
TANJA D.
CIRKOVIC, MARIJA DJ. GAVROVIC-JANKULOVIC, MIRJANA N. BUKILICA**, LJUBA MANDIC,
SPOMENKA Z. PETROVIC** and RATKO M. JANKOV
Faculty of Chemistry, Studentski trg 16, YU-11000 Belgrade,
*Institute of Rheumatology, YU-11000 Belgrade, and
**Institute for Immunology and Virology, Torlak, Vojvode Stepe
458, YU-11221 Belgrade, Yugoslavia
(Received 12 February
2002)
An acid phosphatase from an extract of mugwort (Artemisia
vulgaris) pollen was purified by a factor of 48 by a combination of ion
exchange and gel-chromatography. The molecular weights of the enzyme were 76
kDa and 73 kDa, determined by gel filtration on a Sephadex G-100 sf column and
by SDS PAGE (under reducing and non-reducing conditions), respectively. In
analytical isoelectrofocusing, the enzyme appears as two very close bands, pI
at about 4.2. The optimum pH for the enzyme is 5.4. The apparent Km for p-nitrophenyl phosphate was estimated to be 0.16 mM.
The purified enzyme has broad specificity, and hydrolyses p-nitrophenyl
phosphate and a-naphthyl phosphate. Pyrophosphate and O-phospho-L-tyrosine
were estimated to be the best substrates for this enzyme as potential in
vivo substrates. The enzyme is inhibited competitively by phosphate (Ki = 1.25 mM), molybdate (Ki = 0.055 mM) and pyrophosphate (Ki = 6.7 mM) and non-competitively by fluoride (Ki = 9.8 mM). Metal ions such as Hg2+, Cu2+ and Zn2+ express an inhibitory
effect on the enzyme, while the enzyme is slightly activated by non-ionic
detergents, Tween 20 and Triton X-100. There is no change in the enzyme
activity in the presence of tartrate, citrate, EDTA, 1,10-phenanthroline and
sulfhydryl-group modifiers such as p-chloromercuribenzoate and N-ethylmaleimide.
Keywords: acid phosphatase, Artemisia
vulgaris, Compositae, mugwort, pollen, purification.
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J.Serb.Chem.Soc.
67(8–9)573–579(2002) |
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Radiochemical purity and particles
number determinations of modified 99mTc-macroaggregated
albumin
DIVNA DJOKIC,
DRINA JANKOVIC and TATJANA MAKSIN
Laboratory for Radioisotopes, The “Vinca” Institute of Nuclear
Sciences, P. O. Box 522, YU-11001 Belgrade, Yugoslavia, E:mail:
djokici@vin.bg.ac.yu
(Received 8 March 2002)
Abstract: A new procedure for the aggregation of
human albumin and 99mTc-labelling of the prepared macroaggregated
albumin are presented. Simple methods for quantifying of all the radiochemical
impurities existing in 99mTc-MAA were tested. Thus, 85 % methanol was used
as the mobile phase in paper and ITL chromatography with Whatman Noo 1 and ITLC-SA strips. A system of two solvents (acetone and 1 M
NaCl or 0.9 % NaCl) was used for 3 MM paper, ITLC-SA and ITLC-SG strips and
silica gel plates as the stationary phase. Low-voltage paper electrophoresis
with Whatman 3 MM paper sheets soaked in barbiturate buffer and the gel
chromatography column method (Sephadex G-25) were also applied. Filtration
through syringe filters, proposed by European and Yugoslav Pharmacopoeia, was
performed for comparison. The application of the mentioned tests lead to
consistent results for the labelling efficiency (> 98.5 %) and percent
radiochemical impurities of 99mTc-MAA. Determination of
the particles number in a counter chamber and their size distribution under a
light microscope with a calibrated ocular scale gave the result of 300000
–350000 particles per 1 mg of HA. This confirmed that the human albumin
macroaggregates prepared by our new procedure is remarkably improved and
convenient for routine diagnostic purposes.
Keywords: human albumin macroaggregates, 99mTc-labelling, quality control.
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J.Serb.Chem.Soc.
67(8–9)581–586(2002) |
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Excess molar volume of the
acetonitrile + alcohol systems at 298.15 K. Part I: Density measurements for acetonitrile
+ methanol, + ethanol systems
IVONA R.
GRGURIC, ALEKSANDAR Z. TASIC, BOJAN D. DJORDJEVIC, MIRJANA LJ. KIJEVCANIN and
SLOBODAN P. SERBANOVIC
+
(Received
17 April 2002)
The
excess molar volume VE of the
binary liquid systems acetonitrile + methanol and acetonitrile + ethanol has
been evaluated from density measurements at 298.15 K and at atmospheric
pressure over the entire composition range. A vibrating tube densimeter, type
Anton Paar DMA 55, was applied for these measurements. The Redlich–Kister
equation was used to fit the experimental VE data.
Keywords:
density measurements, excess volume, methanol, ethanol, acetonitrile.
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J.Serb.Chem.Soc.
67(8–9)587–591(2002) |
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Desorption of 137Cs+ from
mosses
SNEZANA
DRAGOVIC, SLOBODANKA STANKOVIC and OLGICA NEDIC
Institute for the Application of Nuclear Energy – INEP, Banatska
31b,YU-11080 Zemun
(Received 18 February,
revised 29 May 2002)
Mosses are biomonitors that accumulate large
amounts of various pollutants, including radionuclides. In this work we
investigated the possibility of 137Cs extraction from mosses, as well as the
significance of species specificity on the efficiency of 137Cs desorption. Salt and acid solutions were used as extraction
media. It was shown that a 5 % solution of both ammonium oxalate and phosphoric
acid was able to desorb 81.8 % of 137Cs+ from Homalothecium sericeum, which was 39.9 % more than
desorption from water. At the same time, most of the desorbed 137Cs+ was incorporated in crystals that precipitated
from the solution. An interspecies difference in respect to 137Cs+ desorption was noticed.
Keywords: moss, 137Cs+, extraction.
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J.Serb.Chem.Soc.
67(8–9)593–603(2002) |
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Substituted ferrocenes: Synthesis
and correlation of their electronic spectra with structure (LFER)
E. A. KASSAB,
M. I. MARZOUK and M. EL-HASHASH
Faculty of Science, Ain Shams University, Cairo, Egypt and
Industrial Education College, Ammeria, Cairo, Egypt
(Received 7 November
2001, revised 7 May 2002)
Three series of diacylferrocences (I) and
ferrocenylidene acetophenones (II) and monoalkyl ferrocences (III) were
synthesized and their electronic spectra in the visible region were studied.
The bands exhibited by compounds (II) show a good correlation between their
wave numbers and the Hammett s constants.
Keywords: substituted ferrocences, synthesis
of, electronic spectra of diacylferrocences, ferrocenylidene acetophenones,
mono- and disubstituted ferrocenes.
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J.Serb.Chem.Soc.
67(8–9)605–615(2002) |
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Magnetic, thermal and spectroscopic
properties of 5-chloro-2-methoxybenzoates of Mn(II), Co(II), Ni(II), Cu(II) and
Zn(II)
BEATA BOCIAN
and WIESŁAWA FERENC
Department of General Chemistry, Faculty of Chemistry, Maria
Curie-Sklodowska University, Pl 20-031, Lublin, Poland
(Received 12 December
2001, revised 22 April 2002)
The 5-chloro-2-methoxybenzoates of Mn(II),
Co(II), Ni(II), Cu(II) and Zn(II) were synthesized as solids and their
magnetic, spectral and thermal properties studied. The complexes possess
colours typical of the M(II) ions. The thermal stabilities were examined in air
and nitrogen atmospheres and the products of decompositions were also
identified. The magnetic susceptibilities of the complexes were measured over
the temperature range 4.4–300 K and the magnetic moments were calculated. The
results show that the 5-chloro-2-methoxybenzoates of Mn(II), Co(II) and Ni(II)
are octahedral, high-spin complexes.
Keywords: 5-chloro-2-methoxybenzoates,
Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes, magnetic moments, thermal
stability, FTIR spectra.
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J.Serb.Chem.Soc.
67(8–9)617–624(2002) |
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SHORT COMMUNICATION
Coordination
polymers of Fe(III) with ligands derived from dinaphthyl-, dinaphthylthio-, and
dinaphythyldithio- phosphinic acids
IOAN ROSCA,
DANIEL SUTIMAN, MIHAELA VIZITIU, DOINA SIBIESCU, ADRIAN CAILEAN and LIVIA OPREA
Technical University “Gh. Asachi”, Faculty of Industrial
Chemistry, Department of Inorganic Chemistry, B-dul D. Mangeron 71 A. Iasi,
Iasi-6600, Romania
(Received 28 January,
revised 8 April 2002)
The synthesis and the study of some coordination
polymers derived from the interaction of the acetylacetonate of Fe(III) with
dinaphthylphosphinic acid, dinaphthylthiophosphinic acid and
dinaphthyldithiophosphinic acid are presented. The methods applied for the
study were chemical analysis, gel chromatography, Mössbauer and IR absorption
spectroscopy, X-ray diffraction and thermogravimetric analysis from which the
kinedic parameters of the thermal decomposition reactions were determined. The
semiconductive properties of the synthesized compounds were also examined.
Based on the obtained experimental data and on literature indications, the
structural formulae of these compounds were assigned.
Keywords: organophosphinic acids,
coordinative compounds, Fe(III), Mössbauer, XRD, conductivity.
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J.Serb.Chem.Soc.
67(8–9)625–634(2002) |
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Electrochemical deposition and
characterization of zinc-nickel alloys deposited by direct and pulse current
JELENA B. BAJAT
, MIODRAG D. MAKSIMOVIC and GORAN R. RADOVIC
Faculty of Technology and Metallurgy, University of Belgrade,
Karnegijeva 4, P. O. Box 3503, YU-11120 Belgrade, Yugoslavia
(Received 17 April 2002)
Chemical composition and phase structure of
Zn-Ni alloys obtained by electrochemical deposition under various conditions
were investigated. The alloys were deposited on a rotating disc electrode and
steel panel from chloride solutions by direct and pulse current. The influence
of the pulse plating variables (on-time, off-time, relation of off- and
on-time) on the composition, phase structure and corrosion properties were
investigated. The phase composition affects the anticorrosive properties of
Zn-Ni alloys during exposure to a corrosive agent (3 % NaCl solution). It was
shown that a Zn-Ni alloy electrodeposited by pulse current with a pulse time of
1 ms and an off- and on-time ratio of 1 exhibits the best corrosion properties.
Keywords: Zn-Ni alloy, electrodeposition,
pulse current, ALSV, corrosion.
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J.Serb.Chem.Soc.
67(8–9)635–638(2002) |
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PRELIMINARY COMMUNICATION
An
estimation of the interfacial energy of the copper- copper sulphate solution
interface and of the specific surface of copper powder
K. I. POPOV ,
N. D. NIKOLIC* and Z. RAKOCEVIC**
Faculty of Technology and Metallurgy, Karnegijeva 4, Belgrade, P.
O. Box 35-03, YU-11001 Belgrade,
*ICTM-Institute of Electrochemistry, Njego{eva 12, P. O. Box 815,
YU-11001 Belgrade, and
**Vinca Institute of Nuclear Sciences, P. O. Box 522, YU-11001
Belgrade, Yugoslavia
(Received 18 April 2002)
A possible way for the estimation of the
interfacial energy of the copper – copper sulphate solution interface is
proposed. The estimated value of (2.7± 0.3) J cm-2 and the derived equations
which relate the specific surface of copper powder to the deposition conditions
permit an estimation of the specific surface of copper powderc The agreement
between the estimated value and literature data is very good.
Keywords: interfacial energy copper – copper
sulphate solution, specific surface of copper powder.
Copyright & copy; SHD 2002.
Last
Updated September 2, 2002.
For
more information contact: SHD@elab.tmf.bg.ac.yu