- The role of copper ions in Tb(III) luminescence sensitization in heterometallic complexes with podands
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It has been demonstrated that copper-induced terbium(III) luminescence sensitization in heterometallic complexes with hydrazine-containing podands is caused by the ligand ring closure and joint coordination of both metal ions to the carbonyl oxygen atoms
- Golovach, Yu. P.,Kiriyak,Ognichenko,Basok,Kovalevskaya,Rakipov,Kuz’min,Meshkova
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- Rapid transesterification of aliphatic and aromatic esters using sodium bis(ethylenedioxy)borate-a mild catalyst
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A simple, selective transesterification of aliphatic and aromatic esters using a mild base sodium bis(ethylenedioxy)borate is described. The transesterification reactions were performed both in microwave and ultrasonication. Aromatic compounds forms diesters of ethylene glycol while aliphatic compounds forms only monoesters. The IR, MS and NMR characterization are given. In this work, an environmentally benign process for the production of biodiesel from oils using heterogeneous catalyst was developed. Mild borate catalyst was adopted for the production of biodiesel. A study for optimizing the reaction conditions such as the reaction time, the reaction condition, the use of co-solvent and the amount of catalyst, was performed.
- Ramasubramanian,Gopi, Sreeraj,Matharasi, D. Priya,Narasimhan
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experimental part
p. 3660 - 3662
(2012/01/30)
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- Synthesis and biological evaluation of some new 2-oxazoline and salicylic acid derivatives
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Starting from methyl salicylate and 2-amino-2-(hydroxymethyl)propane-1,3- diol 1a, or 2-amino- 2-methylpropane-1-ol 1b, the 2-oxazoline derivatives 2a, 2b or 3, as well as mono- 4a and 4b and bis- 5a and 5b derivatives of salicylic acid were synthesized. Reactions were performed by microwave irradiation in the presence of tetrabutylammonium bromide or metallic sodium as catalyst, as well as by conventional heating. Microwave-induced reaction of some diols, diamines and amino alcohols with methyl salicylate gave mono- and/or bis- derivatives of salicylic acid 4c, 5c, 5d, 6c, 8c, 7a, 7b, 8a and 8b. The mono- and bis-salicyloyl derivatives 4c, 5c and 5d were transformed to the corresponding phenyl-azo derivatives 9, 10c and 10d. The structure of compound 3 was proved by the X-ray analysis and the R-configuration on its stereocenter was confirmed. The antioxidant and cytotoxic activities of the synthesized derivatives were evaluated in a series of in vitro tests. Compounds 5d, 8b and 8c exhibited very strong activity against hydroxyl radical. Six 4c, 5d, 8a-c, 10c of 16 tested compounds inhibited growth of MDA-MB-231 cells at a nanomolar concentration. Compounds 8c and 10c showed high cytotoxicity against MCF7 cells, whereas compounds 4c, 5d, 8a-c and 10d showed high activity against K562 cells. ARKAT-USA, Inc.
- Djurendic, Evgenija,Vujaskovic, Sanja Dojcinovic,Sakac, Marija,Ajdukovic, Jovana,Gakovic, Andrea,Kojic, Vesna,Bogdanovic, Gordana,Klisuric, Olivera,Gasi, Katarina Penov
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experimental part
(2011/05/11)
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