JSCS - Vol 66, No 2

JSCS Vol 66, No. 2

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J. Serb Chem. Soc. 66(2) 65–71 (2001)
UDC 547.455.643:546.814:542.9
JSCS – 2832
Original scientific paper

SnCl₄induced formation of C₇–C₁₆-alkyl D-glucopyranosides

STANIMIR KONSTANTINOVIC , JASMINA PREDOJEVIC , VLADIMIR PAVLOVIC*, SVETISLAV GOJKOVIC** and JÁNOS CSANÁDI***

Department of Chemistry, Faculty of Science, University of Kragujevac, P. O. Box 60, YU-34000 Kragujevac, E-mail: konstan@eunet.yu,
*Faculty of Chemistry, University of Belgrade, P. O. Box 158, YU-11001 Belgrade,
**Institute for Chemistry, Technology and Metallurgy, Njegoseva 12, YU-11000 Belgrade and
***Institute of Chemistry, Faculty of Science, University of Novi Sad, Trg Dositeja Obradovica 3, YU-21000 Novi Sad, Yugoslavia

(Received 12 July, revised 10 November 2000)
The SnCl₄ catalyzed glycosylation reaction of b-peracetylated sugar derivative (glucose) with fatty alkanols is used in the synthesis of C₇ –C₁₆ -alkyl glucopyranosides.
Keywords: synthesis of C₇ – C₁₆ -alkyl D-glucopyranosides; tin(IV) chloride as Lewis acid catalyst.

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J. Serb. Chem. Soc. 66(2) 73–80 (2001)
UDC 547.513/543.87i/:546.271/541.128.3/
JSCS–2833
Original scientific paper

BF₃ etherate-induced formation of C_3-11-alkenyl 2,3-unsaturated glucosides

STANIMIR KONSTANTINOVIC , JASMINA PREDOJEVIC , SVETISLAV GOJKOVIC* and VLADIMIR PAVLOVIC**

Department of Chemistry, Faculty of Science, University of Kragujevac, P. O. Box 60, YU-34000 Kragujevac, E-mail: konstan@eunet.yu;
*Institute for Chemistry, Technology and Metallurgy, Njegoseva 12, YU-11000 Belgrade, and
**Faculty of Chemistry, University of Belgrade, P. O. Box 158, YU-11001 Belgrade, Yugoslavia

(Received 25 September 2000)
BF₃ etherate-induced formation of C_3-11 -alkenyl 2,3-unsaturated glucosides was used as the key step in their synthesis from glucose and C₃ -C₁₁ -alkenols.
Keywords: synthesis of C_3-11 -alkenyl 2,3-unsaturated glucosides, Ferrier reaction.

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J. Serb. Chem. Soc. 66(2) 81–86 (2001)
UDC 547.455.643:547.22.1:542.9
JSCS – 2834
Original scientific paper

Preparation of some D-glucofuranosides from unprotected D-glucose

D. JONIAK and M. POLÁKOVÁ*

Institute of Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 842 38 Bratislava, Slovakia, *e-mail: chemkosi@nic.savba.sk

(Received 23 August 2000)
O-Glycosidation of 3-(4-methoxyphenyl) propyl alcohol, benzyl alcohol and vanillin with totally unprotected D-glucose, performed in a heterogeneous media and
promoted by anhydrous ferric chloride, afforded competent D-glucofuranosides as the major and D-glucopyranosides as the minor products of the reaction.
Keywords: O-glucosidation, synthesis of D-glucofuranosides.

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J. Serb. Chem. Soc. 66(2) 87–93 (2001)
UDC 547.789:547.416:542.9
JSCS–2835
Original scientific paper

Synthesis and application of 2-aminothiadiazole disperse dyes for nylon fabrics

HARI RAGHAV MARADIYA and VITHAL SOMA PATEL*

V. P. and R. P. T. P. Science College, Vallabh Vidyanagar 388 120 Gujarat State, India and
*De-partment of Chemistry, Sardar Patel University, Vallabh Vidyanagar 388120, Gujarat State, India

(Received 5 September 2000)
Some disperse dyes based on 2-amino-5-mercapto-1,3,4-thiadiazole have been prepared by coupling with various N-arylacrylamides. The dyes were characterized by IR spectral studies and elemental analysis. All the dyes were applied as disperse dyes on nylon fabric. These dyes have been found to give a wide range of color shades with very good depth and levelness on fabrics. The percentage dye bath exhaustion and fixation on the fabric have been found to be very good. The dyied fabrics showed moderate to good light fastness and very good to excellent washing, rubbing, persperation and sublimation fastness properties.
Keywords: 2-amino-5-mercapto-1,3,4-thiadiazole, disperse dyes, N-arylacrylamide, nylon fabric, exhaustion, fixation, fastness.

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J. Serb. Chem. Soc. 66(2) 95-99 (2001)
UDC 622.337:623.458.1
JSCS – 2836
Short communication

SHORT COMMUNICATION
Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale

OLGA CVETKOVIC, JOSEPH A CURIALE*, VESNA DRAGUTINOVIC , DANIEL JARVIE**, MIROSLAV M VRVIC*** and DRAGOMIR VITOROVIC

Center of Chemistry-ICTM, Njego{eva 12, YU-11001 Belgrade, Yugoslavia,
*Unocal Corporation, 14141 Southwest Freeway, Sugar Land, Texas, 77478 U.S.A.,
**Humble Geochemical Services, 218 Higgins Street, Humble, TX 77338, U.S.A. and
***Faculty of Chemistry, University of Belgrade, P. O. Box 158, YU-11001 Belgrade, Yugoslavia

(Received 11 October 2000)
Aleksinac oil shale organic matter appeared to remain unchanged, according to ele-mental, IR, P-GC and P-GC-MS analytical characterization, after exposure to Bacillus
circulans-Jordan desilicification for 30 days. These experiments indicate that “siliceous bacteria” may have potential as an alternative, “biochemical agent” for the isolation of native kerogen, and justify further efforts toward continuedevaluation of this advantageous process.
Keywords: oil shale, Aleksinac shale, organic matter stability, bacterial desilicification, Bacillus circulans-Jordan, kerogen preparation.

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J. Serb. Chem. Soc. 66(2) 101–106 (2001)
UDC 547.538.7:539.144.3
JSCS – 2837
Original scientific paper

On a class of approximate formulas for total p-electron energy of benzenoid hydrocarbons

IVAN GUTMAN and TANJA SOLDATOVIC

Faculty of Science, University of Kragujevac, P. O. Box 60, YU-34000 Kragujevac, Yugoslavia

(Received 19 July 2000)
The method for obtaining approximate formulas of the (n,m)-type for the total p-electron energy of benzenoid hydrocarbons (communicated in J. Serb. Chem. Soc. 54 (1989) 189) is simplified and extended so as to include arbitrary spectral moments. The accuracy of the formulas thus obtained is very good and these need no additional fitting by means of empirically determined parameters.
Keywords: total p-electron energy, benzenoid hydrocarbons, spectral moments.

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J. Serb. Chem. Soc. 66(2) 107–117 (2001)
UDC 533.665:533.6.013.13
JSCS – 2838
Original scientific paper

The calculation of theoretical energetic performances of composite rocket propellants

MILOS FILIPOVIC and NIKOLA KILIBARDA

Military Technical Institute, Kataniceva 15, YU-11000 Belgrade, Yugoslavia

(Received 25 October 2000)
A suitable method for calculating theoretical energetic performances of a composite propellant was investigated and successfully verified. This method is based on generally accepted hypotheses, consistent and simple calculation of the chemical equilibrium in a predominantly gaseous, multi-component reactive mixture, and on an appropriate numerical scheme involving the propellant formula and the assigned rocket motor operating conditions. Acomputer program, which permits the calculation of the equilibrium composition of the combustion products and the theoretical energetic performances of composite propellants has been developed. The results of the calculations have been compared with data obtained by the programs OPHELIE, MICROPEP, and the program SPP, as documented in the NASA-Lewis Code, which is presently a world-wide standard. All comparisons gave satisfactory agreement.
Keywords: composite propellants, combustion, combustion products, chemical equilibrium, theoretical energetic performances.

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J. Serb. Chem. Soc. 66(2) 119–129 (2001)
UDC 541.138.2:541.134.5:546.35’59’’
JSCS – 2839
Original scientific paper

Carbon monoxide oxidation on bimetallic Ru/Au(111) surfaces

SVETLANA STRBAC, OLAF M. MAGNUSSEN* and ROLF-JÜRGEN BEHM*

ICTM - Institute of Electrochemistry, P. O. Box 815, YU-11001 Belgrade, Yugoslavia and
*Abteilung für Oberflächenchemie und Katalyse, Universität Ulm, D-89069 Ulm, Germany

(Received 20 September, revised 24 November 2000)
The electrochemical deposition of Ru on Au(111) was performed in 0.5 M H₂SO₄+10^-4 M RuCl₃ . The obtained bimetallic Ru/Au(111) surfaces were character-ised
by cyclic voltammetry and in situ STM in 0.5 MH₂SO₄. The Ru deposit consists of nanoscale islands, which merge with increasing coverage. Two different types of bimetallic Ru/Au(111) surfaces with respect to the distribution of Ru islands over the Au(111) substrate surface were obtained. When the deposition was performed at potentials more positive than the range of Au(111) reconstruction, homogeneous nucleation occured resulting in a random distribution of Ru islands. When the deposition was performed on reconstructed Au(111) at low overpotentials, selective nucleation occured resulting in the replication of the Au(111) reconstruction. Only at higher deposition overpotentials, can multilayer deposits be formed, which exhibit a very rough surface morphology. The electrocatalytic activity of such structurally well defined Ru/Au(111) bimetallic surfaces was studied towards CO oxidation with the Ru coverage ranging from submonolayer to several monolayer. COstripping commences at about 0.2 Vand occurs over a broad potential range. The observed influence of the Ru structure on the CO stripping voltammetry is explained by local variations in the COadsorption energy, caused by differences in the local Ru structure and by effects induced by the Au(111) substrate.
Keywords: Ru deposition, Au(111), bimetallic surfaces, STM, CO-oxidation.

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J. Serb. Chem. Soc. 66(2) 131–137 (2001)
UDC 543.251
JSCS – 2840
Original scientific paper

The effect of electrodeposition process parameters on the current density distribution in an electrochemical cell

K. I. POPOV, R. M. STEVANOVIC* and P. M. ZIVKOVIC

Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, P. O. Box 35-03, YU-11001 Belgrade and
*ICTM - Institute of Electrochemistry, Njegoseva 12, P. O. Box 815, YU-11001 Belgrade, Yugoslavia

(Received 23 October 2000)
Cell voltage – current density dependences for a model electrochemical cell of fixed geometry were calculated for different electrolyte conductivities, Tafel slopes and cathodic exchange current densities. The ratio between the current density at the part of the cathode nearest to the anode and the one furthest away were taken as a measure for the estimation of the current density distribution. The calculations reveal that increasing the conductivity of the electrolyte, as well as increasing the cathodic Tafel slope should both improve the current density distribution. Also, the distribution should be better under total activation control or total diffusion control rather than at mixed activation-diffusion-Ohmic control of the deposition process. On the contrary, changes in the exchange current density should not affect it. These results, being in agreement with common knowledge about the influence of different parameters on the current distribution in an electrochemical cell, demonstrate that a quick estimation of the current distribution can be performed by a simple comparison of the current density at the point of the cathode closest to anode with that at furthest point.
Keywords: current density distribution, electrochemical cell.

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