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You searched for: Journal Green chemistry Remove constraint Journal: 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. 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

2. A green-by-design biocatalytic process for atorvastatin intermediate

Author:
Steven K. Ma; John Gruber; Chris Davis; Lisa Newman; David Gray; Alica Wang; John Grate; Gjalt W. Huisman; Roger A. Sheldon
Source:
Green chemistry 2010 v.12 no.1 pp. 81-86
ISSN:
1463-9270
Subject:
DNA shuffling; active ingredients; ambient temperature; anticholesteremic agents; atorvastatin; biocatalysis; biocatalysts; enzymes; glucose; green chemistry; hydrogen cyanide; manufacturing; pH; wastes
Abstract:
... The development of a green-by-design, two-step, three-enzyme process for the synthesis of a key intermediate in the manufacture of atorvastatin, the active ingredient of the cholesterol lowering drug Lipitor®, is described. The first step involves the biocatalytic reduction of ethyl-4-chloroacetoacetate using a ketoreductase (KRED) in combination with glucose and a NADP-dependent glucose dehydroge ...
DOI:
10.1039/b919115c

3. 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

4. A quantum-chemical-based guide to analyze/quantify the cytotoxicity of ionic liquids

Author:
J. S. Torrecilla; J. Palomar; J. Lemus; F. Rodríguez
Source:
Green chemistry 2010 v.12 no.1 pp. 123-134
ISSN:
1463-9270
Subject:
ammonium; anions; cell lines; cytotoxicity; design for environment; green chemistry; imidazoles; ionic liquids; leukemia; median effective concentration; models; moieties; molecular weight; prediction; quantitative structure-activity relationships; quantum mechanics; rats; salts; toxicology
Abstract:
... A COSMO-RS descriptor (Sσ₋ₚᵣₒfᵢₗₑ) has been used in quantitative structure–activity relationship studies (QSARs) based on a neural network for the prediction of the toxicological effect of ionic liquids (ILs) on a leukemia rat cell line (Log EC₅₀ IPC-81) for a wide variety of compounds including imidazolium, pyridinium, ammonium, phosphonium, pyrrolidinium and quinolinium ILs. Sσ₋ₚᵣₒfᵢₗₑ is a two- ...
DOI:
10.1039/b919806g

5. A simple approach to reduce the environmental impact of olefin metathesis reactions: a green and renewable solvent compared to solvent-free reactions

Author:
Manuela Kniese; Michael A. R. Meier
Source:
Green chemistry 2010 v.12 no.1 pp. 169-173
ISSN:
1463-9270
Subject:
catalysts; environmental impact; green chemistry; methylene chloride; olefin; solvents; wastes
Abstract:
... Two widely-studied olefin metathesis reactions, the cross-metathesis of allyl benzene with cis-1,4-diacetoxy-2-butene and the ring closing metathesis of diethyl diallylmalonate, were studied under environmentally more benign reaction conditions. All studied catalysts allowed these reactions to be performed under bulk conditions, thus avoiding large amounts of solvent waste. Moreover, methyl decano ...
DOI:
10.1039/b921126h

6. 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

7. 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

8. 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

9. An unusual common ion effect promotes dissolution of metal salts in room-temperature ionic liquids: a strategy to obtain ionic liquids having organic–inorganic mixed cations

Author:
C. Chiappe; M. Malvaldi; B. Melai; S. Fantini; U. Bardi; S. Caporali
Source:
Green chemistry 2010 v.12 no.1 pp. 77-80
ISSN:
1463-9270
Subject:
X-ray photoelectron spectroscopy; ambient temperature; anions; cations; electrochemistry; electrospray ionization mass spectrometry; green chemistry; ionic liquids; metal ions; nitrates
Abstract:
... A simple strategy has been reported to prepare new ionic liquids with binary systems of organic–inorganic cations exploiting the common ion effect, i.e. dissolving metal salts with organic or inorganic anions (bistriflylimide or nitrate) in ionic liquids bearing the same anions. The resulting concentrated solutions of metal cations in ionic environments, which may have great potential for electroc ...
DOI:
10.1039/b919111a

10. 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

11. 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

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. 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