A comparative study on the transalkylation of diisopropylbenzene with benzene over several zeolitic materials in supercritical CO2 and liquid phase

2006 ◽  
Vol 312 ◽  
pp. 194-201 ◽  
Author(s):  
J SOTELO ◽  
L CALVO ◽  
A VELAZQUEZ ◽  
D CAPILLA ◽  
F CAVANI ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Comparative Study ◽  
Supercritical Co2 ◽  
Zeolitic Materials

Nanosized and delayered zeolitic materials for the liquid-phase Beckmann rearrangement of cyclododecanone oxime

2007 ◽  
Vol 250 (1) ◽  
pp. 161-170 ◽  
Author(s):  
P BOTELLA ◽  
A CORMA ◽  
S IBORRA ◽  
R MONTON ◽  
I RODRIGUEZ ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Beckmann Rearrangement ◽  
Zeolitic Materials

A comparative study of Pd/SiO2 and Pd/MCM-41 catalysts in liquid-phase hydrogenation

2004 ◽  
Vol 5 (10) ◽  
pp. 583-590 ◽  
Author(s):  
Joongjai Panpranot ◽  
Kanda Pattamakomsan ◽  
James G. Goodwin ◽  
Piyasan Praserthdam
Keyword(s):  
Liquid Phase ◽  
Comparative Study ◽  
Liquid Phase Hydrogenation ◽  
Mcm 41

scholarly journals Green Approach Extraction of Perezone from the Roots of Acourtia platyphilla (A. Grey): A Comparison of Four Activating Modes and Supercritical Carbon Dioxide

Molecules ◽  
2019 ◽  
Vol 24 (17) ◽  
pp. 3035 ◽  
Author(s):  
Escobedo-González ◽  
Cabañas ◽  
González ◽  
Sánchez ◽  
Saavedra-Leos ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Comparative Study ◽  
Supercritical Co2 ◽  
New World ◽  
Mechanical Wave ◽  
Internal Reference ◽  
Pharmacological Activities ◽  
Green Approach ◽  
Microwave Irradiations ◽  
Complementary Study

Perezone, a sesquiterpene quinone, is a very important molecule due to its pharmacological activities in addition to the fact that it is considered to be the first secondary metabolite isolated in the new world (America–Mexico, 1852). This study aims to offer a green comparative study about the extraction of the target molecule from the roots of the vegetable specimen Acourtia platyphilla (A. Grey). The study was performed comparing five different modes of extraction: supercritical CO2, electromagnetic infrared and microwave irradiations, mechanical-wave ultrasound versus typical mantle heating procedure. An exhaustive comparative-discussion of the obtained results is provided. It is worth noting that the corresponding quantifications were established using 1H NMR, correlating appropriately the integrals of the vinylic proton H-6 of perezone with the aromatic singlet of p-dinitrobenzene employed as an internal reference. It is also important to highlight that the four presented procedures are novel modes to extract perezone. Finally, a complementary study about the solubility of the target sesquiterpene quinone related to the use of supercritical CO2 is also reported.

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