Isonicotinic acid-ligated cobalt (II) phthalocyanine-modified titania as photocatalyst for benzene degradation via fluorescent lamp
, Pages: 93-98
Joey Andrew A. Valinton, Ji Hye Son, Jeremiah John O. Zafra, Gil Nonato C. Santos, Michael Angelo B. Promentilla and Derrick Ethelbhert C. Yu PDF (230 K)
Abstract: The utilization of bis(isonicotinic acid)phthalocyaninatocobalt (II) [CoPc(isa)2] incorporated on TiO2 has been studied as a photocatalyst to degrade benzene vapor under fluorescent lamp (indoor light) conditions. The photocatalytic activity of [CoPc(isa)2]-TiO2 compared to TiO2 showed an increase in the extent of degradation. The axial isonicotinic acid ligand attached to CoPc improved the degradation rate of benzene as compared with unligated CoPc-TiO2 which may be attributed to the enhancement of electronic structure in the complex due to the additional isonicotinic acid ligand and its possible attachment to the TiO2 surface through the carboxylic acid moiety. Therefore, covalently-linked CoPc(isa)2 to TiO2 can enhance the extent of photodegradation of benzene and other common volatile organic compounds under indoor lighting conditions.
Keywords: Axially-ligated cobalt (II) phthalocyanine, Photocatalyst, Indoor air pollution, Benzene, Titanium (IV) oxide, Photosensitization
Snail shell as a new natural and reusable catalyst for synthesis of 4H-Pyrans derivatives
, Pages: 99-108
Zakaria Benzekri, Houdda Serrar, Said Boukhris, Brahim Sallek and Abdelaziz Souizi PDF (230 K)
Abstract: A simple, efficient and general method for the synthesis of 4H-pyrans is established through a multi component cyclocondensation of aromatic aldehydes, malononitrile and ethyl acetoacetate or acetyl acetone using snail shell as a natural catalyst. In this method the snail shell was used as green and reusable natural catalyst. Excellent yields, short reaction times and availability of the catalyst are the advantages of this method.
Keywords: Heterogeneous catalysis, 4H-pyrans, Snail shell, Natural catalysts, Green catalysts
Design, synthesis and biological evaluation of 1,3,4-oxadiazoles/thiadiazoles bearing pyrazole scaffold as antimicrobial and antioxidant candidates
, Pages: 109-122
Pavithra Gurunanjappa and Ajay Kumar Kariyappa PDF (230 K)
Abstract: A series of semicarbazones, thiosemicarbazones, 1,3,4-oxadiazoles/thiadiazoles bearing pyrazole scaffold were designed and synthesized. All the synthesized new compounds were characterized by 1H NMR, 13C NMR, MS and elemental analysis. The synthesized compounds were screened to probe their in vitro antimicrobial activity against bacteria and fungi species. The structure-activity relationship of the synthesized compounds was studied. The compounds displayed good to excellent potency against tested microorganisms. The in vitro antioxidant activities of the 1,3,4-oxadiazoles/thiadiazoles were evaluated by DPPH, hydroxyl and nitric oxide radical scavenging assay. Among the tested compounds, compound with chloro substitution showed good antioxidant potential.
Keywords: Antimicrobial, Antioxidant, Pyrazole, Semicarbazone, Thiosemicarbazone
[3+2] Cycloadditions of 1-halo-1-nitroethenes with (Z)-C-(3,4,5-trimethoxyphenyl)-N-methyl-nitrone as regio- and stereocontrolled source of novel bioactive compounds: preliminary studies
, Pages: 123-128
Radomir Jasiński, Ewa Dresler, Maria Mikulska and Daniel Polewski PDF (230 K)
Abstract: Preliminary experiments shows, that [3+2] cycloadditions reactions proceeds with full regioselectivity and high stereoselectivity. In consequence, 3,4-trans-2-methyl-3-(3,4,5-trimethoxyphenyl)-4-halo-4-nitroisoxazolidines are forming as predominantly (or sole) products. Additionally, prognosis for the synthesized compounds to be potential ingredients of drugs is good.
Keywords: Cycloaddition, Nitroalkenes, Nitrones, Reactivity, Regioselectivity
Ultrasound assisted N-bromosuccinimde catalyzed one pot condensation approach for synthesis of Bis(indolyl)methanes from primary alcohols
, Pages: 129-135
Prakash Chhattise, Kalpana Handore, Kakasaheb Mohite and Vasant Chabukswar PDF (230 K)
Abstract: A simple, efficient protocol for one pot synthesis of bis(indolyl)methanes from primary alcohols is investigated with N-bromosuccinimde as a catalyst under ultrasound irradiation. Alcohols can be converted into carbonyl compounds by removal of hydrogen in presence of N-bromosuccinimde as an oxidant and can react in situ with indole to give desired bis(indolyl)methanes. In the reported one pot multicomponent condensation reaction N-bromosuccinimde promotes the oxidation of alcohol to aldehyde, facilitating the subsequent condensation with indole to afford bis(indolyl) methanes in good to excellent yields. The inexpensiveness and easy handling are some of important feature of N-bromosuccinimde. The by-product N-succinimide can be easily recovered and recycled to N-bromosuccinimide.
Keywords: Indoles, N-Bromosuccinmide, Ultrasound, Bio(Indolyl)Methanes
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