- Chitosan: A highly efficient renewable and recoverable bio-polymer catalyst for the expeditious synthesis of α-amino nitriles and imines under mild conditions
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Commercial chitosan-without any post-modification with active Bronsted or Lewis acid centers-was found to be a highly efficient renewable and recoverable bio-polymer catalyst for the rapid and convenient synthesis of α-amino nitriles or imines from aromatic aldehydes and amines under mild reaction conditions at room temperature in high to quantitative yields. The α-amino nitrile derivatives were prepared through the Strecker reaction using trimethylsilyl cyanide (TMSCN) and catalyzed by chitosan as a heterogeneous bifunctional organocatalyst.
- Dekamin, Mohammad G.,Azimoshan, Mojtaba,Ramezani, Leila
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supporting information
p. 811 - 820
(2013/04/10)
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- Synthesis, antioxidant and antibacterial activities of some Schiff bases containing hydroxyl and methoxy groups
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A series of Schiff bases were synthesized from different aromatic amines and aromatic aldehydes containing hydroxyl and methoxy groups. These compounds were characterized by IR and 1H NMR. All the compounds were screened for in vitro antioxidant activity using DPPH method and total reducing power activity based on the ability of compounds to reduce the Fe3+-TPTZ complex to the Fe2+/ferrous. Compounds substituted with hydroxyl and other electron donating groups, such as, methoxy groups showed low to high antioxidant activity. In addition, the compounds have been screened for their antibacterial activity against strains of Escherichia coli, Methycillinresistant Staphylococcus aureus, Klebsiella pneumonia and Pseudomonas aeruginosa. The tested Schiff bases at 5 mg/disc showed different antibacterial activities depending on the type of the tested bacterial species. However, E. coli appeared to be sensitive to seven compounds (Ia, Ib, Ic, Id, If, IIb and IIe), while methicillin resistant Staphylococcus aureus (MRSA) was affected by Ic, Ie, IIc and IIe compound. On the other hand, the compounds Ia, Ic, Id, Ie and IIh revealed antibacterial activity against Klebsiella spp. The Pseudomonas aeruginosa was not sensitive to any of the tested Schiff bases.
- Al-Mamary, Mohammed,Abdelwahab, Siddig Ibrahim,Ali, Hapipah Mohd,Ismail, Salma,Abdulla, Mahmood Ameen,Darvish, Pouya
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experimental part
p. 4335 - 4339
(2012/09/07)
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- Synthesis, physicochemical characteristics and biological activity of ruthenium(III) complexes with bidentate (N, O) Schiff bases
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The octahedral ruthenium(III) complexes have been prepared with bidentate Schiff bases derived from condensation of 2-amino-4-methylpyridine and 4-methylaniline with aromatic aldehydes. The obtained complexes were characterized on the basis of their eleme
- Mehta, Bipin H.,Disale, Sameer D.
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p. 315 - 322
(2012/10/29)
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- Synthesis and biological evaluation of novel N, N′-disubstituted urea and thiourea derivatives as potential anti-melanoma agents
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Two series of urea and thiourea derivatives (1a11a, 1b11b) have been synthesized; all the 22 compounds were reported for the first time. Their anti-proliferative activities against the melanoma cell line B16-F10 were evaluated. Among the compounds tested,
- Li, Qing-Shan,Lv, Peng-Cheng,Li, Huan-Qiu,Lu, Xiang,Li, Zi-Lin,Ruan, Ban-Feng,Zhu, Hai-Liang
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p. 708 - 714
(2012/10/29)
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- Synthesis, characterization and thermal studies of Rh(III) complexes derived from bidentate schiff bases
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The Schiff base ligands were derived from 2-hydroxy-3-methoxybenzaldehyde (HL1), 4-hydroxy-3-methoxybenzaldehyde (HL2), with p-toluidine and 3-hydroxybenzaldehyde with 4-hydroxybenzhydrazide (HL 3) and 3-hydroxy-2-naphthoi
- Disale, Sameer,Pawanoji, Aniket,Mehta, Bipin
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experimental part
p. 802 - 806
(2012/01/03)
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- Silica gel supported sodium hydrogen sulfate as an efficient and reusable heterogeneous catalyst for the synthesis of imines in solvent-free conditions under microwave irradiation
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This synthesis of imines has been carried out efficiently by the condensation of carbonyl compounds with amines in the presence of silica gel supported sodium hydrogen sulfate (NaHSO4.SiO2) as a heterogeneous catalyst under microwave irradiation in solvent-free conditions. NaHSO4.SiO2 can be recovered and re-used up to ten times by simple washing with diethyl ether after each use and activated in an oven at 120°C for 1 h, thus rendering the process more economical.
- Gopalakrishnan, Mannathusamy,Sureshkumar, Purushothaman,Kanagarajan, Vijayakumar,Thanusu, Jeyaraman,Govindaraju, Ramalingam
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p. 299 - 303
(2007/10/03)
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- Quantitative solid-solid synthesis of azomethines
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Twenty preparatively useful azomethines have been quantitatively (100% yield at 100% conversion) obtained as hydrates by grinding together solid anilines with solid benzaldehydes without passing through liquid phases. Unlike (acid catalyzed) azomethine syntheses in solution, the solid-solid condensations proceed 'waste-free'. The solid-state mechanisms have been elucidated by atomic force microscopy (AFM) and in part by scanning near-field optical microscopy (SNOM) in three cases. The results indicate long distance migration of the aldehydes into the lattice of the aniline derivatives. Stumpy protrusions are formed at the direct points of contact but also distance sublimation (100 nm range) is succesful in the case of p-chlorobenzaldehyde and p-nitroaniline. Long-range flow of 4-hydroxybenzaldehyde molecules on its (010)-face into contracting crystals of p-toluidine or p-anisidine occurs along two different cleavage planes. Steep hills and valleys are left behind. The molecular migrations through the sites of contact are interpreted in terms of crystals packing. The ease of these solid-solid condensation reactions relies on the crystal packing.
- Schmeyers, Jens,Toda, Fumio,Boy, Juergen,Kaupp, Gerd
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p. 989 - 993
(2007/10/03)
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- Magnetic and Spectroscopic Studies on Some Copper(II) and Nickel(II) Schiff Base Complexes Derived from Vanillin and Aromatic Amines
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Eight planar or octahedral complexes of sulphates of copper(II) and nicke(II) with four Schiff bases viz., vanillideneaniline, vanillidene-o-toluidine, vanillidene-m-toluidine and vanillidene-p-touidine have been prepared.The complexes contain two molecul
- Shukla, Padmaja R.,Jaiswal, Akhilesh,Narain, Gopal
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p. 1014 - 1016
(2007/10/02)
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- Synthesis and Reduction of Nitrones of Vanillin
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Four new vanillin nitrones have been synthesized by condensing vanillin with various arylhydroxylamines.Reduction with sodium borohydride and deoxygenation with zinc dust and acetic acid were studied.
- Rai, Mangat,Kumar, Surinder,Singh, Baldev,Krishan, Kewal,Singh, Ajit
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- Some New Schiffs Bases Derived from Vanillin as Possible Anticonvulsants
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Twenty new anilino- benzylidenes a ten anilino-methyleneoxy>benzylidenes were synthesised.Seven of these compounds when screened for anticonvulsav-activity aga
- Tewari, S. S.,Husain, M. I.,Srivastava, G. C.
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p. 214 - 216
(2007/10/02)
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