Sample records for HALOGENACION (halogenation)
from WorldWideScience.org

Sample records 1 - 20 shown. Select sample records:



1

ESTUDIO TEÓRICO DE LA REGIOSELECTIVIDAD DE LA BOLDINA EN REACCIONES DE SUSTITUCIÓN AROMÁTICA

Sobarzo-Sánchez, Eduardo; Gómez-Jeria, Juan S.
2002-12-01

Resumen en español RESUMEN La regioselectividad de la boldina frente a reacciones de nitrosación y halogenación con bromo molecular y N-halosuccinimidas (halo = Cl, Br, I) en ácido acético ha sido estudiada. En este sentido, se encontró experimentalmente que la boldina reacciona bromo molecular y N-halo-succinimida obteniéndose mono-productos de reacción en la posición C-3. Dicha sustitución sería atribuible a un mecanismo de transferencia de electrones (ET) provocado por la forma (mas) ción de un radical catiónico persistente en la molécula. Por otro lado, la reacción de nitrosación genera en la boldina un producto sustituido en la posición C-8, siendo atribuible a la formación de un complejo electrón donor-aceptor (EDA) entre la boldina y el catión nitrosonio. La regioquímica en la sustitución aromática es explicada a través de los complejos de Wheland y usando descriptores de reactividad tales como la superdeslocalizabilidad electrofílica y radicalaria Resumen en inglés The nitrosation of boldine with nitrous acid in acetic acid and its halogenation with molecular bromine or N-halosuccinimides (halo = Cl, Br, I) in acetic or trifluoroacetic acid exhibit different regioselectivities. Thus, we found that experimentally boldine proceed with Br2 and N-halosuccinimide affording mono-substituted products in C-3 being attributable to the formation of an electron transfer mechanism (ET) while its nitrosation reaction should proceed by electron t (mas) ransfer within an electron donor-acceptor (EDA) complex that precedes the aromatic substitution step. The regiochemistry of the aromatic substitution is explained by Wheland complex and using reactivity descriptors such as electrophilic and free radical superdelocalizabilites

Scientific Electronic Library Online (Spanish)

2

Unusual chlorinated pregnanes from the eastern Pacific octocoral Carijoa multiflora

Dorta, Enrique; Díaz-Marrero, Ana R.; Cueto, Mercedes; D'Croz, Luis; Maté, Juan L.; Darias, José
2004-01-26

Digital.CSIC (Spain)

3

Treatment of retinal degeneration

Cotter, Thomas G.; Doonan, Francesca; Sanvicens, Nuria; O'Driscoll, Carolyn; Messeguer Peypoch, Àngel
2010-02-11

Digital.CSIC (Spain)

4

Ten years measuring PCDDs/PCDFs in ambient air in Catalonia (Spain)

Abad Holgado, Esteban; Martínez Guijarro, Karell; Custems, Lluís; Gómez, Rafael; Guinnart, Xavier; Hernández, Isabel; Rivera Aranda, Josep
2007-01-16

Digital.CSIC (Spain)

6

Synthesis of functionalized nitrogen heterocycles from β- and γ-amino acids by radical decarboxylation

Boto, Alicia; Hernández, Rosendo; León, Yolanda de; Murguía Ibáñez, José Ramón; Rodríguez-Afonso, Abigail
2004-08-11

Digital.CSIC (Spain)

7

Synthesis of functionalized nitrogen heterocycles by radical decarboxylation of β- and γ-amino acids

Boto, Alicia; Hernández, Rosendo; León, Yolanda de; Murguía, José R.; Rodríguez-Afonso, Abigail

10 pages, 1 figure, 2 tables, 9 schemes.-- Supporting information available: Synthesis and spectroscopic data of compounds 18–22 and 25 and the synthetic intermediates 44 and 45. | Iodinated or oxygenated nitrogen heterocycles are obtained by radical decarboxylation of β- and γ-amino acids. This mil...

DRIVER (Spanish)

8

Synthesis of functionalized nitrogen heterocycles by radical decarboxylation of β- and γ-amino acids

Boto, Alicia; Hernández, Rosendo; León, Yolanda de; Murguía Ibáñez, José Ramón; Rodríguez-Afonso, Abigail
2005-02-01

Digital.CSIC (Spain)

10

Synthesis and stability of mixed nonfluorinated 1,1,1-trihalo-alkanes

Francisco, Cosme G.; González Martín, Concepción C.; Kennedy, Alan R.; Rodríguez Paz, Nieves; Suárez, Ernesto
2006-01-02

Digital.CSIC (Spain)

11

Survey of persistent organochlorine contaminants (PCBs, PCDD/Fs, and PAHs), heavy metals (Cu, Cd, Zn, Pb, and Hg), and arsenic in food samples from Huelva (Spain): levels and health implications

Bordajandi, Luisa R.; Gómez, Gema; Abad Holgado, Esteban; Rivera Aranda, Josep; Fernández-Bastón, María del Mar; Blasco, Julián; González, María J.
2004-01-27

Digital.CSIC (Spain)

14

Sintering behaviour of steatite materials with barium carbonate flux

Vela, E.; Peiteado, M.; García, F.; Caballero, A. C.; Fernández Lozano, José Francisco
2007-01-01

Digital.CSIC (Spain)

15

Sesquiterpenes from Laurencia claviformis

Rovirosa, Juana; Soto, Héctor; Cueto, Mercedes; Darias, José; Herrera, José; San Martín, Aurelio
1999-03-10

Digital.CSIC (Spain)

16

Pyranosylmagellanicus a novel structural class of polyhalogenated acetogenins from Ptilonia magellanica

Lorenzo, Manuel; Cueto, Mercedes; San Martín, Aurelio; Fajardo, Víctor; Darias, José
2005-08-24

Digital.CSIC (Spain)

17

Polar di-halogen molecules solvated in bosonic helium clusters: The paradigm of ICl(X)

Lara Castells, M. Pilar de; Prosmiti, Rita; Delgado Barrio, Gerardo; López Durán, David; Villarreal, Pablo; Gianturco, Franco Antonio; Jellinek, J.
2006-11-28

Digital.CSIC (Spain)

18

Perhalophenyl(tetrahydrothiophene)gold(I) complexes as lewis bases in acid−base reactions with silver trifluoroacetate

Fernández, Eduardo J.; Jones, Peter G.; Laguna, Antonio; López-de-Luzuriaga, José M.; Monge, Miguel; Olmos, M. Elena; Puelles, Raquel C.
2007-10-24

Digital.CSIC (Spain)

19

Palladium-Catalyzed Hydroalkynylation of Alkylidenecyclopropanes

Villarino, Lara; López, Fernando; Castedo, Luis; Mascareñas, José L.
2010-01-01

Digital.CSIC (Spain)

20

Oxachamigrenes, new halogenated sesquiterpenes from Laurencia obtusa

Brito, Inmaculada; Cueto, Mercedes; Díaz-Marrero, Ana R.; Darias, José; San Martín, Aurelio
2002-05-24

Digital.CSIC (Spain)

21

Optical fiber sensor for volatile organic vapors.

Laguna, Mariano; Bariáin, Cándido; Garrido, Julián J.; Matías Maestro, I. R.
2001-07-05

Digital.CSIC (Spain)

23

Non-terpenoid C-15 metabolites from the red seaweed Laurencia pinnatifida

González, A. G.; Martín, J. D.; Martín, Víctor S.; Norte, Manuel; Pérez, R.; Ruano, J. Z.; Drexler, S. A.; Clardy, Jon
1982-01-01

Digital.CSIC (Spain)

24

New halogenated monoterpenes from the red alga Plocamium cartilagineum

Díaz-Marrero, Ana R.; Cueto, Mercedes; Dorta, Enrique; Rovirosa, Juana; San Martín, Aurelio; Darias, José
2002-10-08

Digital.CSIC (Spain)

25

New halogenated constituents of the digestive gland of the sea hare Aplysia dactylomela

González, A. G.; Martín, J. D.; Norte, Manuel; Pérez, R.; Weiler, V.; Perales, Áurea; Fayos, José
1983-01-01

Digital.CSIC (Spain)

27

Iodosobenzene diacetate, an efficient reagent for the oxidative decarboxylation of carboxylic acids

Concepción, José I.; Francisco, Cosme G.; Freire, Raimundo; Hernández, Rosendo; Salazar, José A.; Suárez, Ernesto
1986-02-01

Digital.CSIC (Spain)

28

Iodine atoms: a new molecular feature for the design of potent transthyretin fibrillogenesis inhibitors

Mairal, Teresa; Nieto, Joan; Pinto, Marta; Almeida, Maria Rosário; Gales, Luis; Ballesteros, Alfredo; Barluenga, José; Pérez, Juan J.; Vázquez, Jesús T.; Centeno, Nuria B.; Saraiva, Maria Joao; Damas, Ana M.; Planas, Antoni; Arsequell, Gemma; Valencia Parera, Gregorio
2009-01-06

Digital.CSIC (Spain)

29

Immunoenzyme assay of nonylphenol: study of selectivity and detection of alkylphenolic non-ionic surfactants in water samples

Mart’ianov, Andrey A.; Dzantiev, Boris B.; Zherdev, Anatoly V.; Eremin, Sergei A.; Céspedes, Raquel; Petrovic, Mira; Barceló, Damià
2005-01-30

Digital.CSIC (Spain)

30

Halogens (Cl and Br) accumulation in podzols from NW Spain

Martínez Cortizas, A.; Ferro Vázquez, C.; Ferrín Prieto, C.; Costa-Casais, M.; Nóva Muñoz, J. C.
2006-01-01

Digital.CSIC (Spain)

31

Gomerones A–C, halogenated sesquiterpenoids with a novel carbon skeleton from Laurencia majuscula

Díaz-Marrero, Ana R.; Brito, Inmaculada; Rosa, José M. de la; Darias, José; Cueto, Mercedes
2008-09-18

Digital.CSIC (Spain)

33

Genotoxic activity of halogenated phenylglycine derivatives

Boto, Alicia; Gallardo, Juan Antonio; Hernández, Rosendo; Ledo, Francisco; Muñoz, Ana; Murguía Ibáñez, José Ramón; Menacho-Márquez, Mauricio; Orjales, Aurelio; Saavedra, Carlos J.
2006-09-20

Digital.CSIC (Spain)

34

Fragmentation of carbohydrate anomeric alkoxyl radicals: new synthesis of chiral 1-fluoro-1-halo-1-iodoalditols

Francisco, Cosme G.; González Martín, Concepción C.; Kennedy, Alan R.; Rodríguez Paz, Nieves; Suárez, Ernesto
2008-06-23

Digital.CSIC (Spain)

35

Fragmentation of carbohydrate anomeric alkoxy radicals: a new synthesis of chiral 1-halo-1-iodo alditols

González Martín, Concepción C.; Kennedy, Alan R.; León, Elisa I.; Riesco-Fagundo, Concepción; Suárez, Ernesto
2003-12-05

Digital.CSIC (Spain)

36

Excretion of hexachlorobenzene and metabolites in feces in a highly exposed human population

To-Figueras, Jordi; Barrot, Carme; Sala, María; Otero, Raquel; Silva, Mary; Ozalla, Dolores; Herrero, Carmen; Corbella, Jacint; Grimalt, Joan O.; Sunyer, Jordi
2000-05-24

Digital.CSIC (Spain)

37

Estrogenic potential of halogenated derivatives of nonylphenol ethoxylates and carboxylates

García-Reyero, Natàlia; Requena, Vanessa; Petrovic, Mira; Fischer, Birgit; Hansen, Peter-Diedrich; Díaz, Alfredo; Ventura, Francesc; Barceló, Damià; Piña, Benjamín
2004-03-01

Digital.CSIC (Spain)

38

Effects on growth and biochemical responses in juvenile gilthead seabream ‘Sparus aurata’ after long-term dietary exposure to low levels of dioxins

Ábalos, Manuela; Abad Holgado, Esteban; Estévez, Alicia; Solé, Montserrat; Buet, Astrid; Quirós, Laia; Piña, Benjamín; Rivera, Josep
2008-05-09

Digital.CSIC (Spain)

40

Differences in retention of dioxin-like compounds and organochlorinated insecticides on an immunochromatographic column. Interpretation and applicability

Concejero, Miguel A.; Abad Holgado, Esteban; Rivera Aranda, Josep; Herradón García, Bernardo; González, María J.; Frutos, Mercedes de
2004-08-17

Digital.CSIC (Spain)

42

Compounds and their therapeutic use related to the phophorylating activity of the enzyme GSK-3

Conde Ruzafa, Santiago; Martínez Gil, Ana; Pérez Fernández, Daniel Ignacio; Pérez Martín, María Concepción; Moreno Muñoz, Francisco José; Wandosell Jurado, Francisco
2003-07-10

Digital.CSIC (Spain)

43

Chroman derivatives and uses thereof as inhibitors of the activity of decoupling proteins

Rial Zueco, Eduardo; Viso Beronda, Alma; Fernández de la Pradilla Sainz de Aja, Roberto; Castellanos Santamaría, Esther
2010-04-08

Digital.CSIC (Spain)

44
45

Chamigrenelactone, a polyoxygenated sesquiterpene with a novel structural type and devoid of halogen from Laurencia obtusa

Dorta, Enrique; Díaz-Marrero, Ana R.; Cueto, Mercedes; D'Croz, Luis; Maté, Juan L.; Darias, José
2004-08-13

Digital.CSIC (Spain)

46

Catalyst and process to obtain hydrogen peroxide

Frutos Escrig, Pilar de; Campos Martín, Jose Miguel; García Fierro, José Luis; Cano Serrano, Encarnacion; Blanco Brieva, Gema
2008-01-01

Digital.CSIC (Spain)

50

Antifeedant effects of marine halogenated monoterpenes

Argandoña, Víctor H.; Rovirosa, Juana; San Martín, Aurelio; Riquelme, Alejandro; Díaz-Marrero, Ana R.; Cueto, Mercedes; Darias, José; Santana, Omar; Guadaño, Ana; González-Coloma, Azucena
2002-10-22

Digital.CSIC (Spain)

51

An overview on potential energy surfaces of rare-gas dihalogen van der Waals clusters

Delgado Barrio, Gerardo; Prosmiti, Rita; Valdés, Álvaro; Villarreal, Pablo
2006-01-01

Digital.CSIC (Spain)

52

Activities of naphthoquinones against Aedes aegypti (Linnaeus, 1762) (Diptera: Culicidae), vector of dengue and Biomphalaria glabrata (Say, 1818), intermediate host of Schistosoma mansoni

Ribeiro, Karlos A. L.; Carvalho, Cenira Monteiro de; Molina, María Teresa; Pereira Lima, Estelita; López-Montero, Eulogio; Oliveira, Maria Beatriz Farias de; Ventura Pinto, Antonio; Santana, Antônio Euzébio G.; Goulart, Marília O. F.; Reys, José Rui M.
2009-01-01

Digital.CSIC (Spain)

53

A new and efficient one-pot synthesis of pyrido[2,1-f]purine-2,4-diones starting from 6-aminouracil derivatives

Pérez Pérez, María Jesús; Priego, Eva María; Jimeno, M. Luisa; Camarasa, María José
2002-01-01

Digital.CSIC (Spain)