Hydroformylation
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Production of Additives with Antimicrobial Activity via Tandem Hydroformylation-amine Condensation of Soybean FAME Using an Ionic Liquid-Based Biphasic Catalytic System
A biphasic catalytic system based in the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate was employed for tandem hydroformylation-amine condensation reactions of soybean FAME using HRhCO(PPh3)3 as the catalyst precursor and n-butylamine. Using a tenfold excess of the ligand PPh3, the presence of the ionic liquid increased the selectivity for imi
J. Braz. Chem. Soc.. Publicado em: 2016-02
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2. An Electrostatically-Anchored Rhodium(I) Catalyst for the Hydroformylation and Tandem Hydroformylation/Acetalization of Biorenewable Allyl Benzenes
Um catalisador de ródio ancorado em uma resina de troca iônica comercial (IRA900/TPPMS/Rh) foi preparado de maneira direta, através de um protocolo simples, a partir de precursores prontamente disponíveis. O material foi usado como um catalisador heterogêneo para a hidroformilação e a sequência tandem hidroformilação/acetalização do eugenol e do
J. Braz. Chem. Soc.. Publicado em: 2014-12
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3. Hidroformilação do oleato de metila catalisada por complexos de ródio
In this work, we describe the hydroformylation of methyl oleate catalyzed by several rhodium complexes. Parameters including total pressure, phosphorous/rhodium and CO/H2 ratio, temperature and phosphorous ligands were scanned. Total conversion of the starting double bonds was achieved while maintaining excellent selectivity in aldehydes.
Quím. Nova. Publicado em: 2012
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4. Studies on the experimental variables effects on rhodium catalyzed hydroformylation of unsaturated fatty esters and comparison of [RhH(CO)(PPh3)3] and [RhCl3.3H2O] as starting catalytic precursors
Reações de hidroformilação foram realizadas com oleato de metila grau técnico e óleo de soja usando [RhH(CO)(PPh3)3] e [RhCl3.3H2O] (ligação dupla/Rh = 745) como precursores catalíticos, modificados ou não por trifenilfosfina. O complexo [RhH(CO)(PPh3)3] levou a 100% de conversão e 80-91% de produtos hidroformilados em 4 h para ambos substratos, s
Publicado em: 2010
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5. Hidroformilação de monoterpenos para-mentênicos catalisada por complexos de ródio
This paper reports the results on the rhodium catalyzed hydroformylation of terpinolene under milder reaction conditions and in the presence of a phosphorous ligand. An appropriate choice of these conditions allows a relatively rapid hydroformylation of the substrate with a combined selectivity for three main aldehydes of up to 85% at 90% conversion. The mix
Publicado em: 2009
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6. Estudo da diastereoseletividade na interaÃÃo do β-pineno com catalisadores de rÃdio
In this work, electronic structure calculations were carried out in order to study the spatial and electronic effects that drive the diastereoselectivity in the interaction of catalyst of Rhodium with monoterpenes, in particular with β-pinene. The interaction of the catalyst with the substrate, as well as, the insertion reaction of the monoterpene into
Publicado em: 2007
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7. Studies on the experimental variables effects on rhodium catalyzed hydroformylation of unsaturated fatty esters and comparison of [RhH(CO)(PPh3)3] and [RhCl3.3H2O] as starting catalytic precursors
Reações de hidroformilação foram realizadas com oleato de metila grau técnico e óleo de soja usando [RhH(CO)(PPh3)3] e [RhCl3.3H2O] (ligação dupla/Rh = 745) como precursores catalíticos, modificados ou não por trifenilfosfina. O complexo [RhH(CO)(PPh3)3] levou a 100% de conversão e 80-91% de produtos hidroformilados em 4 h para ambos substratos, s
Journal of the Brazilian Chemical Society. Publicado em: 2005-12
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8. Olefin hydroformylation by sol-gel entrapped rhodium catalysts bearing hydrolysable ligands
Complexos de ródio preparados in situ a partir de [Rh(OMe)(COD)]2, [Rh(CO)2(acac)], [Rh(cod)(acac)] ou [Rh(cod)(PPh3)2]+BPh 4- com ligantes como HS(CH2)3Si(OMe)3, Ph2P(CH2)2S(CH 2)3Si(OMe)3 ou Ph2P(CH2)2Si(OMe) 3 foram imobilizados em matrizes de sílica, inorgânicas ou híbridas, pelo processo sol-gel. As matrizes inorgânicas foram preparadas apenas com
Journal of the Brazilian Chemical Society. Publicado em: 2005-02
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9. Organometallic catalysis: some contributions to organic synthesis
In the present paper some general aspects of metal complex catalysis and its applications for oxyfunctionalization of various olefins, including naturally occurring ones, via selective oxidation, hydroformylation and alkoxycarbonylation are discussed.
Química Nova. Publicado em: 2003-03
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10. Seleção de sistemas liquidos bifasicos para a reciclagem de catalisadores homogeneos de Pd e Rh
Homogeneous catalysis with transition metal complexes displays disadvantages related to separation of products and catalysts, wich have generated a variety of efforts towards the development of new recycling procedures, mostly using biphase systems. The aim of this work was the application of liquid biphasic systems to accomplish product/catalyst separation
Publicado em: 2003
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11. New biphenol-based, fine-tunable monodentate phosphoramidite ligands for catalytic asymmetric transformations
Monodentate phosphoramidite ligands have been developed based on enantiopure 6,6′-dimethylbiphenols with axial chirality. These chiral ligands are easy to prepare and flexible for modifications. The fine-tuning capability of these ligands plays a significant role in achieving high enantioselectivity in the asymmetric hydroformylation of allyl cyanide and t
National Academy of Sciences.