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Öğe 3a-bromoperhydro-2,6a-epoxyoxireno[e][2]benzofuran(BLACKWELL PUBLISHING, 2007) Kosar, Basak; Karaarslan, Muhsin; Demircan, Aydin; Bueyuekguengoer, OrhanIn the title compound, C8H9BrO3, the boat form of the six-membered ring is almost symmetrical with respect to the epoxy bridge. The two five-membered rings generated by the epoxy bridge of the six-membered ring adopt envelope conformations, whereas the third five-membered ring adopts a half-chair conformation. The refinement results suggest partial inversion twinning.Öğe A facile synthesis of heterotricycles from furfurylbromoalkenes using thermal IMDA cycloaddition(FREUND PUBLISHING HOUSE LTD, 2006) Demircan, Aydm; Karaarslan, Muhsin; Turac, ErsenA variety of key precursors to the IMDA reaction of furan diene have been prepared via facile alkylation. Subsequently, rigid tricyclic compounds (2a-g) possessing oxygen, nitrogen, and sulfur has been synthesized by employing thermal intramolecular Diels-Alder reactions. These heterocyclic fused tricycles include a bromo quaternary carbon centre obtained stereoselectively with moderate yields (32-44 overall).Öğe A facile synthesis of heterotricycles from furfurylbromoalkenes using thermal imda cycloaddition(2006) Demircan, Aydin; Karaarslan, Muhsin; Turaç, ErsenA variety of key precursors to the IMDA reaction of furan diene have been prepared via fa alkylation. Subsequently, rigid tricyclic compounds (2a-g) possessing oxygen, nitrogen, and sulfur been synthesized by employing thermal intramolecular Diels-Alder reactions. These heterocyclic fu tricycles include a bromo quaternary carbon centre obtained stereoselectively with moderate yields (32 % overall). © 2011 by Walter de Gruyter GmbH & Co. All rights reserved.Öğe Heterosiklik bileşiklerle [4+2] ve radikalik intramoleküler sikloadisyon reaksiyonları(Niğde Üniversitesi, 2007) Karaarslan, Muhsin; Demircan, AydınFuran, tiyofen, pirol çekirdekli bilesiklerin termal intramoleküler Diels-Alder (IMDA) reaksiyonlarına ve molekül içi serbest radikalik halkalasma reaksiyonlarına karsı eğilimleri arastırıldı. Oksijen ve sülfür içeren baslangıç maddeleri, Williamson eter metodolojisi kullanılarak sentezlendi. Tether azot içerdiği zaman; furfuril aminler önce alkillendi, sonra tert-bütoksi karbonat grubu ile korundu. Furan çekirdekli baslangıç maddeleri termal [4+2] halkakatılma islemini, toluen içerisinde, 110°C'de, dört günde gerçeklestirdi. Reaksiyon sonunda halojen atomlu (Br, Cl) bir kuaterner karbona sahip bitisik tri ve tetrasiklik moleküller elde edildi. Oksijen ve sülfürlü bitisik heterosikliklerin (228, 232) bortriflorür-eterat kompleksi ile diklorometan içerisinde - 78°C' de muamelesi, epoksi köprüsünü açtı ve beraberinde gelen aromatizasyon, izobenzofuranol ve izobenzotiyofenolü verdi (%72-76). Ayrıca furan ve tiyofen çekirdekli bilesiklerle, intramoleküler serbest radikalik reaksiyon denemeleri yapıldı. Anahtar Kelimeler: Termal ?ntramoleküler Diels-Alder (IMDA), sikloadisyon, quaterner brom-klor, bortriflorür-eterat .Öğe Niğde ili yöresinde açıkta satılan süt, yoğurt ve beyaz peynirin asidite, yağ, nem, tuz, kalsiyum ve kuru madde miktarlarının saptanması(Niğde Üniversitesi, 2001) Karaarslan, Muhsin; Demircan, AydınÖZET NİĞDE İLİ YÖRESİNDE AÇIKTA SATİLAN SÜT YOGURT VE BEYAZ PEYNİRİN, ASİDİTE, YAĞ, NEM, TUZ, KALSİYUM VE KURU MADDE MİKTARLARININ SAPTANMASI. KARAARSLAN, Muhsin Niğde Üniversitesi Fen Bilimleri Enstitüsü Kimya Anabilim Dalı Danışman :Yrd. Doç. Dr. Aydın DEMİRCAN Haziran 2001,139 sayfa Bu çalışmada, Şubat-Mart 2000 ve Nisan-Mayıs 2001 aylarında Niğde ili yöresinde tüketilen, süt, yoğurt ve beyaz peynirin; asidite, yağ, nem, tuz, kalsiyum ve kuru madde miktarlarının kantitatif analizleri yapılmıştır. 3x30 değişik örnek üzerinde yapılan çalışmada elde edilen sonuçlar, T.S.E. standartları ile karşılaştırılmıştır. Kalsiyum miktarları Atomik Absorbsiyon Spektrofotometresi (AAS) ile analiz edilmiştir. Analiz sonuçlarının her biri grafiklerle gösterilmiştir. Bu deneylerin yanı sıra anket yöntemiyle yöre insanlarının ekonomik koşulları ve yaşam çevreleri incelenmiştir. Sonuçlar Microsoft Exell, ADA (Çukurova Üniversitesi Ziraat Fakültesi Anket Değerlendirme ve Analiz Programı Versiyon 2.2) ve SPSS (SPSS for Windows Versiyon 9.05) programları kullanılarak grafiğe geçirilmiştir. Bu ürünlerin tüketiminin, ailenin ekonomik, sosyolojik ve eğitim düzeyi ile ilgili olduğu saptanmıştır. Anahtar sözcükler: Süt, Yoğurt, Beyaz Peynir, Laktik Asit, Kalsiyum, A. A. S. mÖğe One-Pot Cascade Synthesis of Fused Nitrogen-Containing Heterocycles in Aqueous Media - Utility of N-Protective Groups in Intramolecular Diels-Alder Reaction of Furan(GEORG THIEME VERLAG KG, 2016) Demircan, Aydin; Kandemir, Muhammet K.; Colak, Medine; Karaarslan, MuhsinA metal-free, thermal, intramolecular Diels-Alder (IMDA) reaction of furan in aqueous media without the use of microwave irradiation was investigated. Protection of the amine functionality and the cycloaddition reaction were performed as a one-pot, two-component process. Various nitrogen-protecting groups and their electronic and steric effects on the cycloaddition reaction were studied. The protection-intramolecular Diels-Alder reaction sequence proceeds under environmentally benign aqueous conditions, which are tolerated by substrates with a broad range of nitrogen-protecting groups such as benzyloxycarbonyl (Cbz), trityl, tert-butoxycarbonyl (Boc), trifluoroacetyl, tosyl, mesyl, and p-nosyl [(4-nitrophenyl)sulfonyl]. This study allowed the development of a stereoselective, tandem allylamine isomerization-Diels-Alder cycloaddition sequence leading to the rapid assembly of complex nitrogen-containing heterocycles in a simple one-pot process.Öğe Preparation of heterotricyclic chlorides via intramolecular Diels-Alder reaction of furans(ASIAN JOURNAL OF CHEMISTRY, 2007) Karaarslan, Muhsin; Demircan, AydinA variety of key precursors to the intramolecular Diels-Alder (IMDA) reaction of furan diene have been prepared via facile alkylation. Subsequently, rigid heterotricyclic chlorides 5a-e possessing oxygen, nitrogen and sulfur have been synthesized by employing a thermal IMDA reactions. Use of bulky protecting group on nitrogen 5a-b, such as t-butoxy group, can be utilized to encourage cycloaddition reactions that otherwise does not proceed.Öğe STUDIES ON THE HEAVY METAL REMOVAL EFFICIENCY AND ANTIBACTERIAL ACTIVITY OF 2-(DIPHENYLPHOSPHINO)AMINOPYRIDINE(Soc Chemists Technologists Madeconia, 2018) Sarioz, Ozlem; Malgac, Burcu; Surme, Yavuz; Ilk, Sedef; Karaarslan, MuhsinThe solvent extraction of metal picrates such as Ni2+, Cu2+, Co2+, Pb2+ and Cd2+ from the aqueous to the organic phase was studied using 2-(diphenylphosphino)aminopyridine (Ph(2)PNHpy). The effects of parameters including the pH of the aqueous phase and the ligand solution volume were investigated to determine the extraction ability of the ligand for metal ions. The results showed that the extraction percentages of metal ions were high at low pH values. The antibacterial activity of the aminophosphine was also screened against Escherichia coli (E. coli) ATCC 25922, Staphylococcus aureus (S. aureus) ATCC 25923, Pseudomonas syringae pv. tomato (P. syringae) DC300, Salmonella enterica serotype Typhmurium (S. typhmurium) SL 1344 and Streptococcus mutans (S. mutans) ATCC 25175. From the studies of antibacterial activity, it was observed that the ligand exhibited a potent inhibitory effect against all Gram-negative and Gram-positive bacteria with a diameter of inhibition zone ranging from 3.86 to 18.10 mm. The aminophosphine ligand (Ph(2)PNHpy) should be considered as a suitable bio-active molecule for antimicrobial material design and next-generation, non-toxic drug fabrication. The Ph(2)PNHpy obtained may have the potential for use as an antimicrobial additive for bioengineering applications.Öğe Subtractive-FTIR spectroscopy to characterize organic matter in lignite samples from different depths(PERGAMON-ELSEVIER SCIENCE LTD, 2012) Gezici, Orhan; Demir, Ibrahim; Demircan, Aydin; Unlu, Nuri; Karaarslan, MuhsinOrganic matter present in lignite samples collected from different depths (i.e. top, mid and bottom) of lignite source. Ilgin, Konya province, was examined by using subtractive-FTIR-ATR spectroscopy. FTIR spectra were recorded on (i) original samples, (ii) the samples dried at 105 degrees C and (iii) the samples acid-treated and dried. After a combustion process performed for each sample at 650 degrees C for 15 min, the spectra of samples were recorded and subtracted from the spectra of untreated samples. Hence, a software-based subtraction made it possible to acquire a representative spectra related with organic matter. As the contribution of the bands related with inorganic constituents in lignite samples were eliminated after spectrum-subtraction procedure, difference-spectra led analyzing the spectra related with organic matter in lignite samples, reasonably. Furthermore, the bands related with acidic functional groups, aromatic and aliphatic structures were analyzed on the basis of difference-spectra, easily. From the difference-spectra it was shown that an acid-treatment process under mild conditions caused shift in some specific bands related with carbonyl groups of carboxyls so that the band at around 1710 cm(-1) arisen, while the intensity of the band at around 1420 cm(-1) was diminished. Through the acid-treatment process, acidic groups in lignite samples from different depths were thought to be turned into similar forms by protonation and/or stripping of metal ions originally bonded. Difference-spectra acquired for acid-treated samples made it possible to evaluate the form of carboxylic acid groups present in the studied samples under specific environmental conditions. Hence, a facile and environmentally-friendly methodology was used to analyze organic matter in lignite by using FTIR spectra, and valuable information was acquired about the aliphatic, aromatic and acidic character of the studied lignite samples collected from different depths. The proposed methodology seems to be promising in acquiring approximate representative spectra for lignite organic matter by using little or no chemicals. (C) 2012 Elsevier B.V. All rights reserved.Öğe tert-Butyl 3a-chloro-2-methylperhydro-2,6a-epoxy-oxireno[e] isoindole-5-carboxylate(INT UNION CRYSTALLOGRAPHY, 2007) Kosar, Basak; Karaarslan, Muhsin; Yildiz, Yasar Kemal; Demircan, Aydin; Buyukgungor, OrhanIn the title compound, C14H2OClNO4, the molecules are linked only by weak van der Waals interactions, and the three five-membered rings adopt envelope conformations.Öğe tert-butyl 3a-chloroperhydro-2,6a-epoxyoxireno[e]isoindole-5-carboxylate(INT UNION CRYSTALLOGRAPHY, 2007) Kosar, Basak; Karaarslan, Muhsin; Demir, Ibrahim; Bueyuekguengoer, OrhanIn the title compound, C13H18ClNO4, the molecules are linked only by weak van der Waals interactions. The boat form of the six-membered ring is almost symmetric with respect to the epoxy bridge. The three five-membered rings adopt envelope conformations.
