Buscar
Mostrando ítems 61-70 de 87
Hydrogenation of aromatics with [Ru(g5-C5H5)Cl(TPPDS)2] in biphasic medium
(2011-08-16)
[Ru(g5-C5H5)Cl(TPPDS)2], [TPPDS=P(C6H5)(C6H4SO3
))2] in biphasic (n-heptane/water) medium hydrogenates
toluene, benzene and m-xylene (105 C, 1400 psig H2, substrate/catalyst=600:1, 4 h) and in toluene hydrogenation
gives ...
Biphasic catalysis with RuCl2(DMSO)(TPPMS)3
(2011-08-16)
A mononuclear RuCl2(DMSO)(TPPMS)3 complex (1) (TPPMS ¼ triphenylphosphine monosulfonate) has been
synthesized. Spectroscopic analysis by i.r., u.v.–vis., 1H-, 13C-, 31P-n.m.r., cyclic voltammetry, m.s. analysis and ...
Avian nectar robbers of Passiflora mixta (Pasifloraceae): Do they have a positive effect on the plant?
(Interciencia 36(8): 587-592, 2011-08-05)
The effect of nectar robbing on plant reproduction may be negative, positive or neutral. The effect was evaluated on Passiflora mixta, an Andean high-mountain species that is pollinated
by the Sword-billed Hummingbird ...
Synthesis, characterization, and biphasic ionic liquid media 1-hexene hydrogenation reaction of RuCl2(DMSO)2(NC5H4CO2Na-3)2
(Publicado en Science+Business Media B.V., 2011-06)
RuCl2(DMSO)2(NC5H4CO2Na-3)2 is very soluble
in the ionic liquid (IL) 1-n-butyl-3-methylimidazolium tetrafluoroborate, [(BMIM)BF4]. The complex was prepared by
reacting RuCl2(DMSO)4 with NC5H4CO2Na-3, sodium nicotinate, in ...
Are cloud forest tree structure and environment related in the Venezuelan Andes?
(Austral Ecology 36, Issue 3: 280-289, 2011-05)
Cloud forest vegetation structure and composition were studied in theVenezuelan Andes at three sites in Mérida State. Although the sites are within 10 to 30 km of each other, climatic, geologic and topographic differences ...
The large aperture gamma ray observatory as an observational alternative at high altitude
(2011-02-04)
A pesar de que las observaciones por satélite han permitido desvelar algunos misterios sobre el origen y localización de rayos cósmicos a bajas energías, hay preguntas aún no resueltas en los rangos mas altos de energías ...
Regeneración del páramo después de un disturbio agrícola: una síntesis de dos décadas de investigaciones en sistemas con descansos largos de la Cordillera de Mérida
(Herrera, F., Herrera, I. (Eds): La restauración ecológica en Venezuela. Fundamentos y experiencias. Ediciones IVIC. Altos de Pipe, Venezuela. pp. 123-145, 2011)
El análisis de los patrones y mecanismos involucrados en la recuperación de los ecosistemas durante la sucesión constituye sin duda el aporte más importante de la ecología al desarrollo de fundamentos teóricos para el ...
Physical geography and ecosystems in the tropical Andes
(Herzog, S., Martínez, R., Jørgensen, P. and Tiessen, H. (Eds): Climate Change and biodiversity in the tropical Andes.Capitulo 10. Macarthur Foundation, inter american iInstitute, Scope. Colombia. pp. 152-169, 2011)