| Author (s): |
Stefan Holger Öhlinger
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| Title: |
AN EFFICIENT SYNTHESIS OF β-(3-QUINOLINYL)-α-ALANINE |
| Abstract: |
A convenient synthesis for β-(3-quinolinyl)-α-alanine (4) is presented. Condensation of 2-chloro-3-chloromethylquinoline (5) with diethyl acetamidomalonate (2) gave high yield of diethyl 2-acetylamino-2-(2-chloro-3-quinolinylmethyl)- propanedionate (6), which was dehalogenated in the presence of ammonium formate and palladium/charcoal. Diethyl 2-acetamido-2-(3-quinolinylmethyl)-malonate (3) was easily converted to the amino acid. The condensation reaction between 2 and 6 is also useful for the construction of (1H)-2,3-dihydropyrrolo[2,3-b]quinoline-2,2-bis(carboxylic acid) and pyrrolo[2,3-b]quinoline-2-carboxylic acid derivatives.
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| Keywords: |
reductive dehalogenation; unnatural amino acid; β-(3-quinolinyl)-α-alanine; pyrrolo[2,3-b]quinoline-2-carboxylic acid skeleton.
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| Year: |
2009
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| Initial page: |
1
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| Final page: |
5
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v17.n17.209.4_2009.pdf |
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| Author (s): |
Awni Khatib, Fathi Aqra; Nader Yaghi; Sobhi, Basheer; Isam Sabbah; Basam Al-Hayek and Mohammed Mosa
|
| Title: |
ENVIRONMENTAL POLLUTl0N RESULTING FROM OLIVE OIL PRODUCTION IN PALESTINE |
| Abstract: |
The level of the environmental impact of olive oil production in Palestine was evaluated by measuring the parameters: pH, chemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solids (TSS), total dissolved solids (TDS), the concentration of fat; oil, and grease (FOG), phenols, electric conductivity (EC) total phosphorus (T-P), and total Kjeldahl nitrogen (TKN, and compared with the Jordanian standard values. The results show that the value of these parameters are too high. A local survey has also been conducted by designing a questionnaire that covers oil production yield, water consumptions in olive washing and in oil recovery, wastewater generation relative to olive processed and oil generated, and solid waste product: The data were collected from 92 local olive oil mills, which were analyzed and organized according to the investigated parameters, and categorized according to local selected areas in the West Bank such as Hebron (South), Nablus (Center) and Jenine (North). The results revealed local variations in oil yield and solid waste product due to variations in the type of olive produced. The olives from the South were found to contain larger solid content than those from the North, .resulting in lower oil yield. The overall results indicated that the average oil yield was 23.7%, the solid waste product was 40.0% while the remaining balance was. the water. content (36.7%) in the olive fruit. A representative value at 1.7 m3/ton for wastewater generation was found to be high compared to similar values in other places of the world. This requires a criterious review of the technology and operation of olive mills in Palestine. The characteristics of OMW were found to violate the standards for OMW and this requires the attention of authorities.
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| Keywords: |
Olives, Olive oil, Oil yileld, Solid waste, Water Consumption, Wastewater, COD, BOD, TDS, TSS, OMW.
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| Year: |
2009
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| Initial page: |
7
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| Final page: |
20
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v17.n17.209.9_2009.pdf |
|
|
| Author (s): |
Elizabeth Fatima de Souza, Silvia Dani and Lavinel G. Ionescu
|
| Title: |
PHYSICAL CHEMICAL STUDIES OF THE SURFACTANT DILAURYLDIMETHYLAMMONIUM BROMIDE (DLDMAB): AGGREGATION AND CATALYTIC PROPERTIES |
| Abstract: |
The micellization of dilauryldimethylammonium bromide (DLDMAB) in water was studied by using surface tension measurements. The critical micellar concentration (CMC) was determined at 25°C, 32°C and 40°C and thermodynamic parameters such as the free energy of micellization (∆G°mic), enthalpy (∆H°mic), and entropy (∆S°mic) of micellization were measured. The CMC at 25°C was 4.93 x 10-5 M and the corresponding values of the thermodynamic parameters were: ∆G°mic = -5.87 kcal/mol; ∆H°mic = -1.12 kcal/mol and ∆S°mic = +16.00 e.u. Micelles of the surfactant DLDMAB act as catalysts for the alkaline hydrolysis of p-nitrophenyl diphenyl phosphate (NPDPP) with a maximum catalytic factor of approximately 120 compared to 80 for CTAB. Typical activation parameters measured for 1.00 x 10-3 M surfactant and 0.005 M NaOH were: Ea = 9.7 kcal/mo/; ∆H°≠ = 9.1 kcal/mol; ∆G°≠ = 19.6 kcal/mol and ∆S°≠ = -33.9 e.u. The kinetic results were also analyzed in terms of the pseudo-phase ion-exchange models (PPIE) and showed that the model is applicable to describe the experimental results.
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| Keywords: |
dilauryldimethylammonium bromide; micellization; micellar catalysis; phosphate esters.
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| Year: |
2009
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| Initial page: |
21
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| Final page: |
32
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v17.n17.2009.23_2009.pdf |
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|
| Author (s): |
Maany A. Hamada, Nagah El-Shishtawi and Esam A.Gomaa
|
| Title: |
CONDUCTOMETRIC EVALUATION OF ASSOCIATION CONSTANTS FOR AQUEOUS SOLUTIONS OF CoCl2 IN THE ABSENCE AND PRESENCE OF A MAGNETIC FIELD |
| Abstract: |
The association constants KA for CoCl2 aqueous solutions were calculated using the experimental conductivity values at different salt concentrations. The molar conductivities were measured in the absence and presence of a magnetic field with an average power of 0. 677 KGauss. A new equation for asymmetric 1:2 salts was suggested and used. This equation was derived from Ostwald, Arrhenius, and Fuoss-Shedlovsky theories. The results obtained were discussed and the effect of the magnetic field on the association constants was explained.
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| Keywords: |
CoCl2, conductivity, magnetic field, Ostwald, Arrhenius, Fuoss-Shedlovsky.
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| Year: |
2009
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| Initial page: |
33
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| Final page: |
40
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v17.n17.2009.35_2009.pdf |
|
|
| Author (s): |
Lavinel G. Ionescu
|
| Title: |
CRISTOFORI. SIMIONESCU, FOUNDER OF THE ROMANIAN SCHOOL OF MACROMOLECULAR CHEMISTRY |
| Abstract: |
Prof. Cristo/or L Simionescu was born in Dumbraveni, County of Suceava, Bucovina, Romania on July 17, 1920 and passed away in Jassy on August 6, 2007. He graduated from the Polytechnic Institute of Jassy in 1944, obtained the Doctoral Degree in Technical Sciences from the same institution in 1948, and served as a faculty member in Jassy for over fifty (50) years. He held various other positions including Rector, Vice-President and President of the Academy of Romania, and Director of the "Petru Poni" Institute of Macromolecular Chemistry. He has supervised more than one hundred (100) doctoral dissertations, published over eight hundred (800) scientific papers, and authored or co-authored more than twenty-seven (27) hooks. He was a member of many academies and learned societies throughout the world, Editor of many scientific journals, and received many prizes and awards. Prof. Cristo/or L Simionescu served on the Editorial Board of many international scientific periodicals, including the Southern BrazHian Journal ofChemistry. He is generally considered the father of macromolecular chemistry in Romania.
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| Keywords: |
History of Chemistry, Science in Romania, Macromolecular Chemistry, Polymer Science.
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| Year: |
2009
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| Initial page: |
41
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| Final page: |
55
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v17.n17.2009.43_2009.pdf |
|
|
| Author (s): |
Lavinel G. Ionescu
|
| Title: |
CRISTOFORI. SIMIONESCU, FUNDADOR DA ESCOLA ROMENA DE QUIMICA MACROMOLECULAR |
| Abstract: |
Prof. Cristo/or L Simionescu was born in Dumbraveni, County of Suceava, Bucovina, Romania on July 17, 1920 and passed away in Jassy on August 6, 2007. He graduated from the Polytechnic Institute of Jassy in 1944, obtained the Doctoral Degree in Technical Sciences from the same institution in 1948, and served as a faculty member in Jassy for over fifty (50) years. He held various other positions including Rector, Vice-President and President of the Academy of Romania, and Director of the "Petru Poni" Institute of Macromolecular Chemistry. He has supervised more than one hundred (100) doctoral dissertations, published over eight hundred (800) scientific papers, and authored or co-authored more than twenty-seven (27) hooks. He was a member of many academies and learned societies throughout the world, Editor of many scientific journals, and received many prizes and awards. Prof. Cristo/or L Simionescu served on the Editorial Board of many international scientific periodicals, including the Southern BrazHian Journal ofChemistry. He is generally considered the father of macromolecular chemistry in Romania.
|
| Keywords: |
History of Chemistry, Science in Romania, Macromolecular Chemistry, Polymer Science.
|
| Year: |
2009
|
| Initial page: |
57
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| Final page: |
71
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v17.n17.2009.58_2009.pdf |
|
|
| Author (s): |
Lavinel G. Ionescu
|
| Title: |
BOOK REVIEW HAIDI FIEDLER |
| Abstract: |
HAIDI FIEDLER, "Homens, terra e agua - a relação envolve instintos eternos" "Mankind, Earth and Water-The Relationship that involves Eternal Instincts ", Editora da Autora, Universidade Federal de Santa Catarina, Florianópolis, SC, Brasil, 2008, 46 paginas. Este livro, publicado em portugues e ingles, conta a hist6ria de uma molecula menina chamada Moleculina, com apelido Lina, que nasceu em 4 de Março de 1921. Sua mae era a Sra. Oxigenio e seu pai era o Sr. Hidrogenio. Lina nasceu e cresceu em conjunto com outras moleculas que formavam um agregado puro e cristalino, um meio superior, chamado "agua pura e cristalina" em um rio pr6ximo a Cordilheira dos Andes, na fronteira entre Peru, Bolivia e Chile na America Latina.
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| Keywords: |
book review, haidi fielder, mankind, .
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| Year: |
2009
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| Initial page: |
73
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| Final page: |
79
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| Link: |
Acessar |
| DOI: |
10.48141/SBJCHEM.v17.n17.2009.73_2009.pdf |
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