Insights into the Organocatalyzed Synthesis of Urethanes in Supercritical Carbon Dioxide: An In Situ FTIR Spectroscopic Kinetic Study
SMITH, Christopher A.
Institut des Sciences Moléculaires [ISM]
Laboratoire de Chimie des Polymères Organiques [LCPO]
Institut des Sciences Moléculaires [ISM]
Laboratoire de Chimie des Polymères Organiques [LCPO]
CRAMAIL, Henri
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 2 LCPO : Biopolymers & Bio-sourced Polymers
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 2 LCPO : Biopolymers & Bio-sourced Polymers
SMITH, Christopher A.
Institut des Sciences Moléculaires [ISM]
Laboratoire de Chimie des Polymères Organiques [LCPO]
Institut des Sciences Moléculaires [ISM]
Laboratoire de Chimie des Polymères Organiques [LCPO]
CRAMAIL, Henri
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 2 LCPO : Biopolymers & Bio-sourced Polymers
< Leer menos
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 2 LCPO : Biopolymers & Bio-sourced Polymers
Idioma
en
Article de revue
Este ítem está publicado en
ChemCatChem. 2014, vol. 6, n° 5, p. 1380-1391
Wiley
Resumen en inglés
The kinetics of urethane (carbamate) formation in supercritical CO2 (scCO(2)) has been studied by insitu FTIR spectroscopy by using the reaction between n-butanol and toluene-2,4-diisocyanate as a model for the synthesis ...Leer más >
The kinetics of urethane (carbamate) formation in supercritical CO2 (scCO(2)) has been studied by insitu FTIR spectroscopy by using the reaction between n-butanol and toluene-2,4-diisocyanate as a model for the synthesis of polyurethanes. We have evaluated the efficiency of different organocatalysts for this transformation to eliminate the need for potentially toxic organotin compounds. Bicyclic guanidines and amidines (7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene and 1,8-diazabicyclo[5.4.0]undec-7-ene) lead to a significant acceleration of the reaction rate, but we found that their activity in scCO(2) is reduced compared to reactions in conventional media because of the formation of guanidinium or amidinium alkylcarbonate salts. In scCO(2), these catalysts are also sensitive to the presence of water and can lead to the formation of allophanate or isocyanurate byproducts. On the other hand, we have shown that catalysis with amine N-oxides (N-methylmorpholine-N-oxide) is suited to the scCO(2) medium.< Leer menos
Palabras clave en inglés
CO2
SOLUBILITY
STRONG BASE
SIDE REACTIONS
PHENYL ISOCYANATE
HOMOGENEOUS CATALYSIS
TOLUENE DIISOCYANATE
ISOCYANATE REACTIONS
polymers
organocatalysis
kinetics
green chemistry
supercritical fluids
DISPERSION POLYMERIZATION
POLYURETHANE ELASTOMERS
Orígen
Importado de HalCentros de investigación