Authors:Preeti Gupta, Tanvi Agrawal, S. S. Das, and N. B. Singh
ionic liquids, supercritical carbon dioxide and water or to perform the reactions in solventfree conditions [ 6 – 9 ]. Keeping in mind the ease of preparation and ecofriendly conditions, attempts have been made to prepare some compounds through organic
Authors:Edson C. da Silva Filho, Pedro D. R. Monteiro, Kaline S. Sousa, and Claudio Airoldi
ethylenesulfide (Es) molecule in the polysaccharide chain through the reaction of the available amino group. An environmentally friendly solvent-free reaction was explored and the activity in sorbing divalent lead and cadmium from aqueous solution was studied
Authors:Daniel Bennardi, Gustavo Romanelli, Juan Autino, Luis Pizzio, Patricia Vázquez, Cármen Cáceres, and Mirta Blanco
Keggin heteropolyacids are found to be selective and recyclable catalysts for the preparation of flavones. The reaction was
carried out in different reaction media, homogeneous, heterogeneous and solvent-free conditions. The solvent-free conditions
represent the best green conditions.
Authors:Andrés Pena, Santiago Veiga, Mariángeles Sapelli, Natalia Martínez, Victoria Márquez, Eduardo Dellacassa, and Juan Bussi
, although solvent-free conditions were also tested in some cases. When oxygen is used as the oxidant, an autooxidation mechanism is proposed to take place, in which the epoxidation and allylic oxidation products takes place by a free radical chain mechanism
Authors:Edson da Silva Filho, Sirlane Santana, Júlio Melo, Fernando Oliveira, and Claudio Airoldi
Cellulose was chemically modified with SOCl2 to obtain chlorodeoxycellulose, followed by a reaction that gave bonded ethylene-1,2-diamine (en), producing 6-(2′-aminoethylamino)-6-deoxycellulose.
The reactions were carried out without the presence of solvent, in water or in N,N′-dimethylformamide, in which the highest amount of amino compound was incorporated onto the biopolymer backbone. The X-ray
diffraction patterns for the chlorodeoxycellulose indicate new crystallinities that result from hydrogen bonds established
through bonded chorine atoms and the remaining hydroxyl groups, while all the aminodeoxycelluloses were amorphous compounds.
Thermal stabilities, for all aminated celluloses gave lower final mass losses than for the chlorinated biopolymer, whose value
is lower than unmodified cellulose.
(PW 12 O 40 ) as well as undecatungstophosphate (PW 11 O 39 ) for solventfree liquid phase oxidation of styrene using hydrogen peroxide as an oxidant. The oxidation reaction was studied by varying different parameters such as reaction time and amount
Authors:Jeong-In Yu, Hye-Ji Choi, Manickam Selvaraj, and Dae-Won Park
(allyl glycidyl ether or 2-[(prop-2-en-1-yloxy)methyl] oxirane) is shown in Scheme 1 . The MPR[amim][X] catalyst was weighed in air (0.5 g) and introduced into a 55-mL high-pressure reactor containing 40 mmol of AGE under solvent-free conditions, and
Authors:Giuseppe D'Auria, Giacinto D'Amore, Aldo Romano, and Francesco Marra
from green coffee beans ( Upadhyay et al., 2012 ), pesticides and metals. In this work the solventfree microwave extraction technique ( Lucchesi et al., 2004 ), as an alternative to the traditional ones, has been analyzed, based on microwave heating
Authors:D. Braga, S. Giaffreda, M. Curzi, Lucia Maini, M. Polito, and Fabrizia Grepioni
Supramolecular reactions between crystalline materials can be exploited to prepare both hydrogen bonded co-crystals and coordination
networks. Mechanical mixing of molecular crystals as well as kneading provide an alternative, solvent-free, route to novel
materials hence these methods represent a green route to supramolecular solid-state chemistry.
Three phenylenediammonium sulfate (PDAS) salts were prepared under solvent free conditions and characterized by gravimetric,
spectroscopic and elemental analyses. Thermal decomposition studies of the salts have been investigated using TG (static air),
TG/DTG and DSC (inert atmosphere). The thermal decomposition pathways have also been suggested and it has been found that
PDAS salts on heating under vacuum in solid state give diaminobenzene sulfonic acids (DABSA) via proton transfer.