Browsing by Author "XX577369"
Now showing items 21-37 of 37
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Gómez Machuca, Horacio; Quiroga Campano, Cinthia; Zapata Torres, Gerald; Jullian Matthaei, Carolina (American Chemical Society, 2020)The interaction mechanism between a scarcely soluble copper(II) complex of Cu(II)-6-hydroxychromone-3carbaldehyde-(3'-hydroxy)benzoylhydrazone( CuCHz) in aqueous solution and its DM beta CD complex was studied in the ...
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Sobarzo Sánchez, Eduardo; Saitz Barría, Claudio; Jullian Matthaei, Carolina; Cassels Niven, Bruce (MARCEL DEKKER INC, 2002)The abundant aporphine alkaloid (S)-(+)-boldine (1) was selectively nitrosated with sodium nitrite in acetic acid affording 8-nitrosoboldine (2) which was hydrogenated catalytically to give 8-aminoboldine (3). The latter ...
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Sobarzo Sánchez, Eduardo; Cassels Niven, Bruce; Saitz Barría, Claudio; Jullian Matthaei, Carolina (JOHN WILEY & SONS LTD, 2001-06)The novel heterocycles 1,11-dimethoxy-2-hydroxy-6-methyloxazolo[4,5-k]-5,6,6a,7-tetrahydro-4H-dibenzo [de,g]quinoline, 1,12-dimethoxy-2-hydroxy-6-methyl-9-phenyl-10H-oxazin[5,6-k]-5,6,6a,7-tetrahydro-4H-dibenzo ...
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Fuente, J. de la; Cañete Molina, Alvaro Félix; Saitz Barría, Claudio; Jullian Matthaei, Carolina (AMER CHEMICAL SOC, 2002-08-08)Photoreduction of 3-phenylquinoxalin-2-ones, XNQ, by triethylamine, TEA, gives a metastable semireduced quinoxalin-2-one via an electron-proton-electron transfer, with unit quantum yields at high amine concentrations. ...
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Fuente, J. de la; Neira Pacheco, Verónica Alejandra; Saitz Barría, Claudio; Jullian Matthaei, Carolina; Sobarzo Sánchez, Eduardo (AMER CHEMICAL SOC, 2005-07-07)Photoreduction by amines of oxoisoaporphine dyes occurs via a stepwise mechanism of electron-proton electron transfer that leads to the metastable N-hydrogen oxoisoaporphine anion. During photoreduction that occurs from ...
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Fuente, J. de la; Jullian Matthaei, Carolina; Saitz Barría, Claudio; Sobarzo Sánchez, Eduardo; Neira Pacheco, Verónica Alejandra; González, C.; López, R.; Pessoa Mahana, Hernán (ROYAL SOC CHEMISTRY, 2004)Photoreduction of 5,6-dimethoxy-, 5-methoxy- and 2,3-dihydro-7H-dibenzo[de, h] quinolin-7-one (A) by tertiary amines in oxygen-free solutions generates long-lived semi-reduced metastable photoproducts, A - NH-, via a ...
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Insuasty, B.; Saitz Barría, Claudio; Insuasty, H.; Quiroga, J.; Jullian Matthaei, Carolina (HETERO CORPORATION, 2000-03)Several new 6-amino- and 6,8-dinmino-4-aryl-2,3-dihydropyrimido[4,5-b][1,4]diazepines were obtained from the reaction of 4,5,6-triaminopyrimidine 1a and 2,4,5,6-tetraaminopyrimidine 1b with one equivalent of 3-dimethylam ...
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Insuasty, B.; Insuasty, H.; Saitz Barría, Claudio; Quiroga, J.; Jullian Matthaei, Carolina (HETERO CORPORATION, 1999-05)New 4-Aryl-6-methyl-8-phenyl-2,3-dihydropyrazolo[3,4-b]diazepines and 4-aryl-8-methyl-6-phenyl-2,3-dihydropyrazolo[4,3-b]diazepines were obtained from the reaction of 4,5-diamino-3-methyl-1-phenylpyrazole 1 with one ...
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Sobarzo Sánchez, Eduardo; Cassels Niven, Bruce; Jullian Matthaei, Carolina; Castedo, Luis (John Wiley & Sons, Ltd., 2003-01-07)inolin- 7-one, 2,3-dihydro-5-methoxy-7H-dibenzo [de,h] quinolin-7-one, 5-methoxy-6-hydroxy-2,3-dihydro-7Hdibenzo[ de,h]quinolin-7-one, 5,6-dimethoxy-2,3-dihydro- 7H-dibenzo[de,h]quinolin-7-one and 5,6-methylenedioxy- ...
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Jullian Matthaei, Carolina; Miranda, Sebastián; Zapata Torres, Gerald Amilcar; Mendizábal Emaldía, Fernando; Olea Azar, Claudio (PERGAMON-ELSEVIER SCIENCE LTD, 2007-05)The aim of this paper is to describe the inclusion properties and the factors affecting the complexation selectivity and stabilization of catechin (CA) into beta-cyclodextrin (beta-CD) and two of its derivatives, namely ...
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Quiroga Campano, Cinthia del Rosario; Gómez Machuca, Horacio Exequiel; Jullian Matthaei, Carolina; Fuente Urrutia, Julio de la; Pessoa Mahana, Hernán; Saitz Barría, Claudio (Springer, 2014)The present work describes a study of complexation efficiency and selectivity of calix[4]arenes bearing benzoimidazolyl, benzothiazolyl, and benzoxazolyl heterocycles (5–7) towards several selected metal ions ...
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Jullian Matthaei, Carolina; Fernández Sandoval, Samuel Esteban; Celis Barros, Cristian; Abarca, Belén; Ballestero, Rafael; Zapata Torres, Gerald (Elsevier, 2015)tThe chemosensor 3-phenyl-7-(pyrid-2-yl)-[1,2,3]triazolo[1,5-a]pyridine (PhPTP) used in combinationwith two different cyclodextrins, enable its solubilization and stabilization in aqueous solution. Thebehavior of the ...
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Quiroga, J.; Insuasty, B.; Hormaza, Angela; Saitz Barría, Claudio; Jullian Matthaei, Carolina (HETERO CORPORATION, 1998-05)Reaction of 5-amino-3-methyl-1-phenylpyrazole (1a) and 5-amino-3-(4-chlorophenyl)-1H-pyrazole (1b) with dimedone (2) and p-susbstituted benzaldehydes 3 in ethanol, afforded in all cases tricyclic linear 4-aryl- ...
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Saitz Barría, Claudio; Fuente, J. de la; Jullian Matthaei, Carolina; Pessoa Mahana, Hernán; Olea, Carolina (SCIENCE REVIEWS LTD, 2008-06)A novel series of calix[4]arenes bearing benzothiazole, benzoxazole, and benzoimidazole groups were obtained by the reaction of the corresponding 2-mercaptoheterocycle with 5,11,17,23-tetra-tert-butyl-25,27-bis[2-(chloroacetamido) ...
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Da Silva, Jaqueline; Barría, Claudio; Jullian Matthaei, Carolina; Navarrete Encina, Patricio; Núñez Vergara, Luis; Squella Serrano, Juan (SOC BRASILEIRA QUIMICA, 2005-01)1,4-dihydropyridine derivatives constitute an important pharmacological group for the treatment of cardiovascular diseases. We have synthesised a series 4-(5'-nitro-2'-furyl)-1,4-dihydropyridine derivatives, which were ...
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Fuente, J. de la; Jullian Matthaei, Carolina; Saitz Barría, Claudio; Neira Pacheco, Verónica Alejandra; Poblete, Oscar.; Sobarzo Sánchez, Eduardo (AMER CHEMICAL SOC, 2005-10-28)Photoreduction of oxoisoaporphine dyes occurs via a stepwise mechanism of electron-protonelectron transfer that leads to the N-hydrogen oxoisoaporphine anion. When triethylamine, TEA, was used as the electron donor in ...
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Fuente, Julio R. De la; Cañete, Álvaro; Jullian Matthaei, Carolina; Saitz Barría, Claudio; Aliaga, Christian (The American Society of Photobiology, 2013)Photoinduced electron transfer between N-phenylglycine (NPG) and electronically excited triplets of 7-substituted-3- methyl-quinoxalin-2-ones in acetonitrile generate the respective ion radical pair, where by decarboxylation ...