Browsing by Title Facultad de Ciencias
Now showing items 7320-7339 of 8177
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(2014)The crystalline structure of spinels is extremely flexible due to the presence of several sublattices in which the cations can be distributed and localized in different crystallographic sites depending on their sizes, ...
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(Elsevier Science BV., 2016)A new hybrid hetero nanocomposite, consisting of ZnO(myristic acid)/Ag-NPs, has been synthesized. The nanocomposite, made up of single ZnO nanosheets sandwiched between myristic acid self-assembled monolayers was synthesized ...
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Synthesis and pyrolysis of silicon and tin containing poly(2,2 '-dioxy-1,1 '-biphenoxy-phosphazenes) (PERGAMON-ELSEVIER SCIENCE LTD, 2008-03)The polyphosphazene {[NP(O2Cl2H8)](0.5)[NP(OC6H4Br)(2)](0.5)}(n) (1) [(O2C12H8) = 2,2'-dioxy-1,1'-biphenyl] that, as an strictly alternating copolymer, can be considered nearly as the homopolymer [NP(O2C12H8)NP(OC6H4Br)(2)](n), ...
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(Elsevier Ltd, 2002)The reactions of the cyclic phosphazenes [N3P3Cl6] and [N3P3(O2C12H8)2Cl2] (O2C12H8 /2,2?-dioxybiphenyl) with the diphenylphosphine phenol complex {Mn(CO)2(h5 -C5H4Me)[PPh2(C6H4 /OH)]} (1) and Cs2CO3 in refluxing acetone ...
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(Elsevier Ltd, 2002)The polyspirophosphazene copolymer {[NP(O2C12H8)]0.7[NP(OC5H4N)2]0.3}n (2); that carries pyridine side groups has been prepared from [NPCl2]n , by reaction first with 2,2?-dihydroxybiphenyl and potassium carbonate in THF ...
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(Kluwer Academic Publishers, 1995)The synthesis and structural aspects of urea host-guest inclusion compounds containing linear secondary alkylamines (dibutyl-,dipentyl-, dihexyl-, dioctyl-) at 25°C are reported. Elemental analysis,13C CP-MAS NMR and1H-NMR ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2006-01-02)The phosphazene copolymers {[NP(O2C12H8)](0.5)[NP(O-C6H4-CO2Pr")(O-C6H4-L)](0.5)}(n) [L=CN (1), PPh2, (2)] and {[NP(O2C12H8)](0.6)[NP(O-C6H4-CO2Pr")(O-C6H4-L)](0.4)}(n) (3) have been synthesized by sequential substitution ...
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(2006)The phosphazene copolymers {[NP(O2C12H 8)]0.5[NP(O-C6H4-CO 2Prn)(O-C6H4-L)]0.5} n [L = CN (1), PPh2 (2)] and {[NP(O2C 12H8)]0.6[NP(O-C6H 4-CO2Prn)(O-C5H4N)] 0.4}n (3) have been synthesized by sequential substitution from ...
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(American Chemical Society, 1999-02)Reaction of Cp*Re(CO)(2)I-2 with methylcopper affords cis-Cp*Re(CO)(2)(Me)I, which converts to the trans isomer on prolonged reaction or in the presence of neutral alumina. The X-ray structure of the trans isomer has been ...
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(2009)1,5-Benzodiazepines have been synthesized from the corresponding 2'-hydroxychalcones [1-(2-hydroxyphenyl)-3-aryl-2-propen-1-ones] and o-phenylenediamine, both in methanol, under reflux and under solvent-free microwave ...
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(SOCIEDAD CHILENA DE QUIMICA, 2006-03)A simple synthetic route for the preparation of 2-phenyl-1,3-propanediamines, based on a Knoevenagel-Michael double condensation followed by reduction, was developed using nitromethane as reagent and solvent, and sodium ...
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(Sociedad Química de Chile, 2006)A simple synthetic route for the preparation of 2-phenyl-I,3-propanediamines, based on a Knoevenagel-Michael double .:ondensation followed by reduction, was developed using nitromethane as reagent and solvent, and sodium ...
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(SOC CHILENA QUIMICA, 2009-07-20)The synthesis of 4,5,8,12b-tetrahydroisoindolo[1,2-a]isoquinolin-8-ones is reviewed The unsubstituted parent compound, a series of fourteen A-ring-substituted derivatives, most of them new, and some of their doubly benzylic, ...
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(2007)Coupling nicotinoyl chloride with 3,4-dimetoxyphenethylamine under Bischler-Napieralski cyclization afforded the isoquinoline (4) in good yield. This latter was used as starting material to obtain with only hydrobromic ...
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(2001)The synthesis of low-density polyethylene from ethylene as the only monomer feed has been investigated as an alternative route to branched polyethylene and to obtain new materials with different properties, avoiding the ...
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(Elsevier, 2015)An efficient, green, and atom economic methodology for the stereoselective synthesis of C-2 symmetry (3R,4R)-TTFOL diester derivatives has been developed. The procedure occurs through a (2R,3R)-TADDOL dioxolane cleavage ...
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(Elsevier, 2014)Three coumarin-derived fluorescent probes, 3-acetyl-7-[(6-bromohexyl)oxy]-2H-chromen-2-one (FM1), 7-[(6-bromohexyl)oxy]-4-methyl-2H-chromen-2-one (FM2) and ethyl 2-{7-[(6-bromohexyl)oxy]-2-oxo- 2H-chromen-4-yl}acetate ...
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(Elsevier, 2016)In the current study, a new approach to the synthesis of highly destacked ReS2 layers embedded in amorphous carbon via the thermal decomposition of a tetraoctylammonium perrhenate precursor, under sulfidizing atmosphere ...