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You searched for: Journal name Green chemistry Remove constraint Journal name: Green chemistry Publication year rev 7990-2010 Remove constraint Publication year rev: 7990-2010 Source 2010 v.12 no.1 Remove constraint Source: 2010 v.12 no.1
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1. Amidine-mediated delivery of CO₂ from gas phase to reaction system for highly efficient synthesis of cyclic carbonates from epoxides

Author:
Balaka Barkakaty; Kazuhide Morino; Atsushi Sudo; Takeshi Endo
Source:
Green chemistry 2010 v.12 no.1 pp. 42-44
ISSN:
1463-9270
Subject:
carbon dioxide; carbonates; epoxides; gases; green chemistry
Abstract:
... A novel, efficient synthesis of cyclic carbonates from the reaction of epoxides and gaseous CO₂ under mild conditions (1 atm, rt to 45 °C) was achieved in reasonable yields (65–83%) by using N-methyltetrahydropyrimidine (MTHP) that facilitated efficient delivery of CO₂ from the gas phase to the reaction system. ...
DOI:
10.1039/b916235f

2. Assessing the greenness of some typical laboratory ionic liquid preparations

Author:
Maggel Deetlefs; Kenneth R. Seddon
Source:
Green chemistry 2010 v.12 no.1 pp. 17-30
ISSN:
1463-9270
Subject:
green chemistry; ionic liquids; planning
Abstract:
... The greenness, or lack thereof, of various ionic liquid syntheses and purification methodologies are assessed using a common tool used in strategic planning viz. strengths weaknesses opportunities threats (SWOT) analysis, including their adherence to the twelve principles of green chemistry, % atom economies and E-factors. ...
DOI:
10.1039/b915049h

3. Characterization of CO₂ precipitated Kraft lignin to promote its utilization

Author:
Máté Nagy; Matyas Kosa; Hans Theliander; Arthur J. Ragauskas
Source:
Green chemistry 2010 v.12 no.1 pp. 31-34
ISSN:
1463-9270
Subject:
acid deposition; biocompatible materials; biorefining; carbon dioxide; environmental impact; forests; green chemistry; kraft pulping; lignin; moieties; molecular weight; nuclear magnetic resonance spectroscopy; oxygen; pulp; streams; washing
Abstract:
... Converting pulp mills into forest biorefineries to produce biopower and biomaterials can decrease their environmental impact and increase feasibility at the same time. One of the key challenges to reach this goal is the recovery of lignin from process streams for subsequent utilization in a variety of innovative green processes. This study examines the fundamental chemical structure of lignin reco ...
DOI:
10.1039/b913602a

4. Facile palladium catalyzed Suzuki–Miyaura coupling in air and water at ambient temperature

Author:
Alexander N. Marziale; Stefan H. Faul; Thomas Reiner; Sven Schneider; Jörg Eppinger
Source:
Green chemistry 2010 v.12 no.1 pp. 35-38
ISSN:
1463-9270
Subject:
Suzuki reaction; air; ambient temperature; catalysts; catalytic activity; filtration; green chemistry; palladium
Abstract:
... A new palladacyclic catalyst yields high activities in aqueous Suzuki–Miyaura coupling at room temperature. Using an optimized protocol, a broad range of products can be isolated in good to excellent yields and high purity by simple filtration. ...
DOI:
10.1039/b915436a

5. High performance magnetic separation of gold nanoparticles for catalytic oxidation of alcohols

Author:
Rafael L. Oliveira; Pedro K. Kiyohara; Liane M. Rossi
Source:
Green chemistry 2010 v.12 no.1 pp. 144-149
ISSN:
1463-9270
Subject:
air; benzyl alcohol; carbon; catalysts; catalytic activity; chemical reduction; energy; gold; green chemistry; hydrogen; magnetic separation; magnetism; magnetite; nanogold; nanoparticles; oxidation; particle size; polymers; temperature
Abstract:
... We present the magnetic separation approach to facilitate the recovery of gold nanoparticle (AuNP) catalysts. The use of magnetically recoverable supports for the immobilization of AuNPs instead of traditional oxides, polymers or carbon based solids guarantees facile, clean, fast and efficient separation of the catalyst at the end of the reaction cycle. Magnetic separation can be considered an env ...
DOI:
10.1039/b916825g

6. Immobilization of Pd nanoparticles with functional ionic liquid grafted onto cross-linked polymer for solvent-free Heck reaction

Author:
Gang Liu; Minqiang Hou; Jiyuan Song; Tao Jiang; Honglei Fan; Zhaofu Zhang; Buxing Han
Source:
Green chemistry 2010 v.12 no.1 pp. 65-69
ISSN:
1463-9270
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; alkenes; arylation; bromine; catalysts; catalytic activity; composite polymers; crosslinking; green chemistry; ionic liquids; nanoparticles; organoiodine compounds; palladium; thermogravimetry; transmission electron microscopy
Abstract:
... 1-Aminoethyl-3-vinylimidazolium bromide ([VAIM]Br) grafted on the cross-linked polymer polydivinylbenzene (PDVB) was synthesized. The copolymers were used as a support to immobilize palladium nanoparticles. The catalyst was characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric (TG) analysis, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy ( ...
DOI:
10.1039/b913182e

7. New one-pot multistep process with multifunctional catalysts: decreasing the E factor in the synthesis of fine chemicals

Author:
Maria J. Climent; Avelino Corma; Sara Iborra; Maria Mifsud; Alexandra Velty
Source:
Green chemistry 2010 v.12 no.1 pp. 99-107
ISSN:
1463-9270
Subject:
catalysts; green chemistry; manufacturing
Abstract:
... The synthesis of a series of fine chemicals (4-(4-methoxyphenyl)-2-butanone, 4-(6,6-dimethylbicyclo[3,1,1]hept-2-en-2-yl)-2-butanone, and 2-cyclopentylcylopentanone) has been performed through a simple process that involves one-pot multi-step reactions (condensation–dehydration–reduction) using multifunctional base–acid-metal catalysts. The E factor for the specific process, as well as for the glo ...
DOI:
10.1039/b919660a

8. Ruthenium-catalyzed synthesis of β-oxo esters in aqueous medium: Scope and limitations

Author:
Victorio Cadierno; Javier Francos; José Gimeno
Source:
Green chemistry 2010 v.12 no.1 pp. 135-143
ISSN:
1463-9270
Subject:
alcohols; carboxylic acids; catalysts; catalytic activity; esters; green chemistry; p-cymene; ruthenium
Abstract:
... The ability of the hydrosoluble ruthenium(ii) complexes [RuCl₂(η⁶-arene)(PTA)] 3a–d, [RuCl₂(η⁶-arene)(PTA-Bn)] 4a–d, [RuCl₂(η⁶-arene)(DAPTA)] 5a–d, [RuCl₂(η⁶-arene)(TPPMS)] 6a–d (arene = C₆H₆, p-cymene, 1,3,5-C₆H₃Me₃, C₆Me₆) to promote the atom-economic formation of β-oxo esters, by addition of carboxylic acids to terminal propargylic alcohols in water has been explored. Scope, limitations and cat ...
DOI:
10.1039/b914774h

9. Solubilisation of α-chymotrypsin by hydrophobic ion pairing in fluorous systems and supercritical carbon dioxide and demonstration of efficient enzyme recycling

Author:
Karima Benaissi; Martyn Poliakoff; Neil R. Thomas
Source:
Green chemistry 2010 v.12 no.1 pp. 54-59
ISSN:
1463-9270
Subject:
batch systems; butanol; carbon dioxide; catalytic activity; chymotrypsin; cooling; enzyme activity; green chemistry; hydrophobicity; light scattering; solubilization; surfactants; transesterification
Abstract:
... Hydrophobic ion-pairing (HIP) with the fluorinated surfactant KDP 4606 (KDP) was used to extract the protein α-chymotrypsin (CMT) into perfluoromethylcyclohexane (PFMC). The diameter of the solubilised CMT-KDP complexes formed in PFMC was determined by dynamic light scattering (DLS) to be 25 nm which suggested the formation of a protein aggregate containing ∼100 protein molecules surrounded by KDP ...
DOI:
10.1039/b904761a

10. Toxicity of imidazolium ionic liquids towards algae. Influence of salinity variations

Author:
Adam Latała; Marcin Nędzi; Piotr Stepnowski
Source:
Green chemistry 2010 v.12 no.1 pp. 60-64
ISSN:
1463-9270
Subject:
Bacillariophyceae; Chlorella vulgaris; Cyclotella meneghiniana; Geitlerinema; Oocystis; algae; cations; cell walls; chlorides; freshwater; green chemistry; imidazoles; ionic liquids; permeability; salinity; toxicity; Baltic Sea
Abstract:
... This paper reports on a detailed study of the influence of salinity on the biological activity of 1-alkyl-3-methylimidazolium chlorides on two green algae Oocystis submarina and Chlorella vulgaris, one diatom Cyclotella meneghiniana and one blue-green alga Geitlerinema amphibium. All these organisms inhabit the Baltic Sea, an environment naturally varying greatly in salinity. The toxicity effects ...
DOI:
10.1039/b918355h

11. A highly efficient Cu/La₂O₃ catalyst for transfer dehydrogenation of primary aliphatic alcohols

Author:
Ruijuan Shi; Fei Wang; Tana; Yong Li; Xiumin Huang; Wenjie Shen
Source:
Green chemistry 2010 v.12 no.1 pp. 108-113
ISSN:
1463-9270
Subject:
alcohols; aldehydes; catalysts; copper; copper nanoparticles; dehydrogenation; green chemistry; hydrogen; synergism
Abstract:
... La₂O₃-supported copper nanoparticles are sufficiently active for transfer dehydrogenation of primary aliphatic alcohols to aldehydes. When used for 1-octanol, the yield of 1-octanal can be as high as 63%. The catalyst is also highly effective for a wide variety of substrates, such as aromatic, aliphatic, and cyclic alcohols. The yield of the desired products approaches 100% and the turnover freque ...
DOI:
10.1039/b919807p

12. Aerobic oxidative carboxylation of olefins with metalloporphyrin catalysts

Author:
Dongsheng Bai; Huanwang Jing
Source:
Green chemistry 2010 v.12 no.1 pp. 39-41
ISSN:
1463-9270
Subject:
ambient temperature; carbon dioxide; carbonates; carboxylation; catalysts; green chemistry; olefin; oxygen; ruthenium; solvents; styrene
Abstract:
... Dioxo(tetraphenylporphyrinato)ruthenium(vi) and quaternary onium salt were successfully developed as catalysts to initiate a three component reaction of olefin, O₂, and CO₂ at ambient temperature under low pressure. The reaction can be carried out under solvent-free or solvent conditions. Styrene carbonate was obtained in 76% yield with 100% selectivity using 4 mol% of catalyst under optimized con ...
DOI:
10.1039/b916042f

13. Catalyst-free silylation of alcohols and phenols by promoting HMDS in CH₃NO₂ as solvent

Author:
Santosh T. Kadam; Sung Soo Kim
Source:
Green chemistry 2010 v.12 no.1 pp. 94-98
ISSN:
1463-9270
Subject:
green chemistry; phenols; silylation; solvents; temperature
Abstract:
... An uncatalyzed method for the silylation of alcohols and phenols with HMDS in CH₃NO₂ at rt is developed. A diverse range of aromatic and aliphatic alcohols as well as phenols undergo the silylation in very short reaction time with excellent yield. The uncatalyzed reaction requires neither elevated temperature nor high pressure for the silylation. ...
DOI:
10.1039/b913398d

14. Exploring the possibility of using a thermostable mutant of β-glucosidase for rapid hydrolysis of quercetin glucosides in hot water

Author:
Sofia Lindahl; Anna Ekman; Samiullah Khan; Christina Wennerberg; Pål Börjesson; Per J. R. Sjöberg; Eva Nordberg Karlsson; Charlotta Turner
Source:
Green chemistry 2010 v.12 no.1 pp. 159-168
ISSN:
1463-9270
Subject:
Escherichia coli; Thermotoga neapolitana; antioxidants; beta-glucosidase; catalytic activity; environmental impact; enzymatic hydrolysis; food waste; global warming potential; glucosides; glucosylation; green chemistry; hydrochloric acid; hydrolysis; life cycle assessment; methanol; mutants; mutation; onions; primary energy; quercetin; thermal stability; thermophilic microorganisms; thermostable enzymes; toxic substances
Abstract:
... The antioxidant quercetin was extracted from yellow onion waste and converted to its aglycone form by a combination of subcritical water extraction and enzymatic hydrolysis. The hydrolytic step was catalysed by a double residue (N221S, P342L) mutant of the thermostable β-glucosidase (TnBgl1A), isolated from the thermophile Thermotoga neapolitana and cloned and produced in E. coli. The activity of ...
DOI:
10.1039/b920195p

15. Hydrogenation of nitrile in supercritical carbon dioxide: a tunable approach to amine selectivity

Author:
Maya Chatterjee; Hajime Kawanami; Masahiro Sato; Takayuki Ishizaka; Toshirou Yokoyama; Toshishige Suzuki
Source:
Green chemistry 2010 v.12 no.1 pp. 87-93
ISSN:
1463-9270
Subject:
benzylamines; carbon dioxide; catalysts; green chemistry; hydrogen; hydrogenation; imines; palladium; secondary amines; solubility; temperature
Abstract:
... The use of supercritical carbon dioxide (scCO₂) on the hydrogenation of benzonitrile was investigated over Pd and other metal catalysts. Without any additive, benzonitrile was hydrogenated to benzylamine with high conversion (90.2%) and selectivity (90.9%) using the Pd/MCM-41 catalyst. A strong influence of CO₂ pressure on the conversion and selectivity were observed. As the CO₂ pressure increases ...
DOI:
10.1039/b913828e

16. In vitro biocompatibility of nanoscale zerovalent iron particles (NZVI) synthesized using tea polyphenols

Author:
Mallikarjuna N. Nadagouda; Alicia B. Castle; Richard C. Murdock; Saber M. Hussain; Rajender S. Varma
Source:
Green chemistry 2010 v.12 no.1 pp. 114-122
ISSN:
1463-9270
Subject:
biocompatibility; borohydrides; cytotoxicity; dermal exposure; exposure models; green chemistry; humans; iron; keratinocytes; lactate dehydrogenase; mitochondria; nanoparticles; polyphenols; tea; tetrazolium
Abstract:
... A “green” protocol was used for the rapid generation of nanoscale zerovalent iron (NZVI) particles using tea polyphenols. The NZVI particles were subsequently examined for in vitro biocompatibility using the human keratinocyte cell (HaCaT) line as a representative skin exposure model. The cells were exposed to NZVI for time periods of 24 and 48 h. Biocompatibility was assessed using the methyl tet ...
DOI:
10.1039/b921203p

17. Perfluoro-tagged, phosphine-free palladium nanoparticles supported on silica gel: application to alkynylation of aryl halides, Suzuki–Miyaura cross-coupling, and Heck reactions under aerobic conditions

Author:
Roberta Bernini; Sandro Cacchi; Giancarlo Fabrizi; Giovanni Forte; Francesco Petrucci; Alessandro Prastaro; Sandra Niembro; Alexandr Shafir; Adelina Vallribera
Source:
Green chemistry 2010 v.12 no.1 pp. 150-158
ISSN:
1463-9270
Subject:
Suzuki reaction; acetonitrile; aerobic conditions; catalysts; chemical bonding; green chemistry; indoles; nanoparticles; organoiodine compounds; palladium; silica gel
Abstract:
... The utilization of perfluoro-tagged palladium nanoparticles immobilized on fluorous silica gel through fluorous–fluorous interactions (Pdₙₚ–A/FSG) or through covalent bonding to silica gel (Pdₙₚ–B) in the alkynylation of aryl halides, in the Suzuki–Miyaura cross-coupling, as well as in the Heck reaction between methyl acrylate and aryl iodides is described. The reactions are carried out under aero ...
DOI:
10.1039/b915465e

18. Production of p-cymene and hydrogen from a bio-renewable feedstock–1,8-cineole (eucalyptus oil)

Author:
Benjamin A. Leita; Andrew C. Warden; Nick Burke; Mike S. O'Shea; David Trimm
Source:
Green chemistry 2010 v.12 no.1 pp. 70-76
ISSN:
1463-9270
Subject:
Eucalyptus; aluminum oxide; carbon; carbon dioxide; carbon monoxide; catalysts; catalytic activity; cineole; gases; green chemistry; hydrogen; hydrophilicity; hydrophobicity; oils; oxygen; p-cymene; pellets; pyrolysis; solvents; temperature; wastes
Abstract:
... The catalytic transformation of pure 1,8-cineole was performed in a custom-built down-flow fixed bed pyrolysis rig over various metal-doped alumina pellets controlled at temperatures between 523 K (250 °C) and 873 K (500 °C). Varying amounts of oxygen were added to the feed. Hydrophilic, hydrophobic and gaseous products were analysed separately. The hydrophilic phase was predominantly water, while ...
DOI:
10.1039/b916460j

19. An efficient approach to homocoupling of terminal alkynes: Solvent-free synthesis of 1,3-diynes using catalytic Cu(ii) and base

Author:
Dong Wang; Jihui Li; Na Li; Tingting Gao; Sihua Hou; Baohua Chen
Source:
Green chemistry 2010 v.12 no.1 pp. 45-48
ISSN:
1463-9270
Subject:
alkynes; catalysts; catalytic activity; copper; cross-coupling reactions; green chemistry
Abstract:
... We report an environmentally friendly, efficient method for transforming terminal acetylenes into 1,3-diynes based on catalytic amounts of a Cu(ii) salt and base under solvent-free conditions. The developed process conforms to the principles of ‘green’ chemistry and addresses the shortage of such methods for the synthesis of 1,3-diynes. The reaction is quite general and results in good yields. Int ...
DOI:
10.1039/b917448f

20. A facile synthesis of alkylated nitrogen heterocycles catalysed by 3D mesoporous aluminosilicates with cage type pores in aqueous medium

Author:
Rajashree Chakravarti; Pranjal Kalita; S. Tamil Selvan; Hamid Oveisi; V. V. Balasubramanian; M. Lakshmi Kantam; Ajayan Vinu
Source:
Green chemistry 2010 v.12 no.1 pp. 49-53
ISSN:
1463-9270
Subject:
alkylation; aluminum silicates; catalysts; catalytic activity; epoxides; green chemistry; indoles; porous media; pyrroles
Abstract:
... Friedel–Crafts alkylation of nitrogen heterocycles such as indoles and pyrroles with epoxides has been efficiently carried out using cage-type mesoporous aluminosilicates as recyclable catalysts in water under environmentally benign and mild conditions. ...
DOI:
10.1039/b914628h