Reactividad del agregado dodecarboniltrirutenio con una base de Tröger de tipo pirazólico y un aminopirazol

The reaction between [Ru3(CO)12] 1 and the pyrazolic Tröger base 5,12-dimethyl-3,10- b i s - ( p - n i t r o p h e n y l ) - 1,3,4,8,10,11-hexaazatetracyclo[ 6.6.1.02,6.09,13]-pentadeca- 2(6),4,9(13),11-tetraene (TBpz) 2 and 5-amino-3-methyl-1-(pnitrophenyl) pyrazole (amnpz) 3 was studied. Both reactions were carried out in refluxing toluene under inert atmosphere. From compound 2 were obtained two black and brown solids 4a and 4b respectively, being molecular formula [Ru3(TBpz)(CO)n]. From 4a were recently growth some crystals from diluted nitric acid which are currently in X-ray diffraction study. The reaction with 3 yielded the brown solid [Ru3(amnpz)(CO)m] 5. This work covered also some preliminary studies on the catalytic activity of the obtained products. The solids 4a and 4b worked as excellent pre-catalyst in the heterogeneous hydrogenation reaction of cyclohexene (100C, P(H2) 40 atm), yielding turnover of 99% and 76% respectively. The residue 4a- R obtained from the hydrogenation hydrogenation reaction with 4a was recovered and re-utilized for a new hydrogenation reaction under the same reaction conditions yielding a turnover of 89%, which makes suppose that 4a behave as a pre-catalyst more than a true catalyst. With product 5 were carried out two experiments of homogeneous hydrogenation in DMSO and THF as solvents under the same conditions, yielding only 26% and 16% of turnover respectively.

• Autores: Micolta, Germania; Galarza, Esperanza; Abonía, Rodrigo
• Tipo de recurso: Article of journal
• Fecha de publicación: 2005
• Institución: Universidad Autónoma de Occidente
• Repositorio: RED: Repositorio Educativo Digital UAO
• Idioma: spa
• OAI Identifier: oai:red.uao.edu.co:10614/186
• Acceso en línea: http://hdl.handle.net/10614/186
• Palabra clave: Hidrogenacion; Compuestos organometálicos; Hydrogenation; Organometallic compounds
• Rights: openAccess
• License: Derechos Reservados - Universidad Autónoma de Occidente