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Microwave assisted Willgerodt-Kindler reaction of styrenes
, Article Journal of Chemical Research - Part S ; Issue 5 , 2000 , Pages 228-229 ; 03082342 (ISSN) ; Ghaffarzadeh, M ; Dakamin, M. G ; Sharif University of Technology
Scientific Reviews Ltd
2000
Abstract
Styrenes are efficiently transformed to thioamides via the Willgerodt- Kindler reaction under microwave irradiation
Oxidative deprotection of silylethers, acetals and ketals by oxygen or air in presence of manganese and cobalt salts of 4-aminobenzoic acid supported on silica gel as catalyst
, Article Synthetic Communications ; Volume 30, Issue 10 , 2000 , Pages 1857-1863 ; 00397911 (ISSN) ; Kalantari, F ; Sharif University of Technology
Marcel Dekker Inc
2000
Abstract
Oxidative deprotection of silylethers, acetals and ketals, to their corresponding alcohols, aldehydes and ketones have been achieved using oxygen or air in the presence of cobalt and manganese salts of 4-aminobenzoic acid supported an silica gel as catalysts. Reactions are clean and catalysts can be recovered easily and reused repeatedly
Chiral recognition by proton transfer reactions with optically active amines and alcohols
, Article Chemical Communications ; Issue 23 , 2004 , Pages 2740-2741 ; 13597345 (ISSN) ; Chen, H ; Cooks, R. G ; Sharif University of Technology
Royal Society of Chemistry
2004
Abstract
A simple, rapid tandem mass spectrometric method for recognition of chiral molecules by proton transfer reactions with chiral sec-butylamines and sec-butanols is reported
Reactivity studies of biomimetic catalytic epoxidation of alkenes with tetrabutylammonium periodate in the presence of various manganese porphyrins and nitrogen donors: Significant axial ligand π-bonding effects
, Article New Journal of Chemistry ; Volume 28, Issue 6 , 2004 , Pages 740-747 ; 11440546 (ISSN) ; Karimipour, G ; Bagherzadeh, M ; Sharif University of Technology
Royal Society of Chemistry
2004
Abstract
Highly selective epoxidation (> 95%) of unfunctionalized alkenes was performed by tetrabutylammonium periodate in the presence of six different phenyl substituted manganese(III) meso-tetraphenylporphyrins [Mn(Por)] and imidazole in CH2Cl2. Electron-withdrawing and bulky substituents on the phenyl groups lowered the catalytic activities of the corresponding Mn(Por). Less bulky alkenes with electron -rich double bonds showed greater reactivity in the epoxidation. Co-catalytic activities of four different classes of axial nitrogen donors are compared in the presence of various Mn(Por). In general no direct correlation was found between co-catalytic activities and the pKa values of the nitrogen...
A novel and efficient four-component synthesis of chromen–based dithiocarbamate derivatives by homogeneous catalysts under solvent-free conditions
, Article Synthetic Communications ; Volume 51, Issue 12 , 2021 , Pages 1825-1833 ; 00397911 (ISSN) ; Goudarzi, M ; Mohammadzadeh Dezag, H ; Sharif University of Technology
Bellwether Publishing, Ltd
2021
Abstract
An efficient and one-pot procedure is described for the synthesis of a variety of derivatives of 1,2-dihydrobenzo[f]chromen-3-ones and 3,4-dihydrochromen-2-ones under solvent-free conditions via a pseudo-four-component domino reaction of acetic anhydride, aryl aldehydes, glycine-based dithiocarbamates, and phenols/naphthols in the presence of l-proline and H4[Si(W3O10)4].xH2O as green catalysts. All products were made under the green strategy for the synthesis of corresponding products with excellent yields (up to 94%) and diastereoselectivity. © 2021 Taylor & Francis Group, LLC
Oxidation of alcohols and primary aliphatic amines to carbonyl compounds using sodium hypochlorite adsorbed on montmorillonite K10
, Article Journal of Chemical Research - Part S ; Issue 5 , 2000 , Pages 224-225 ; 03082342 (ISSN) ; Beni, Y. A ; Sharif University of Technology
Scientific Reviews Ltd
2000
Abstract
NaClO adsorbed on montmorillonite K10 converts alcohols and primary aliphatic amines into corresponding carbonyl compounds
Highly diastereoselective aminoalkylation of naphthols with chiral amines mediated by lithium perchlorate solution in diethyl ether
, Article Tetrahedron Asymmetry ; Volume 14, Issue 3 , 2003 , Pages 389-392 ; 09574166 (ISSN) ; Azizi, N ; Sharif University of Technology
2003
Abstract
One-pot, three-component, Mannich reaction of naphthols with in situ prepared imines in 5 M ethereal lithium perchlorate at room temperature affords the corresponding aminoalkylated products in high yields with high diastereoselectivities. The process is exemplified by the reaction of 2-naphthol with (R)-1-phenylethylamine and an aromatic aldehyde in concentrated ethereal lithium perchlorate solution, which affords a highly diastereoselective access to the requisite 2-aminoalkylated product. © 2003 Elsevier Science Ltd. All rights reserved
Oxidation of aldehydes and ketones into carboxylic acids and esters using 4-amino-2-chloroperbenzoic acid supported on silica gel
, Article Synthetic Communications ; Volume 35, Issue 8 , 2005 , Pages 1103-1107 ; 00397911 (ISSN) ; Ghazanfari, D ; Ahmadibeni, Y ; Karimi Jaberi, Z ; Ezabadi, A ; Sharif University of Technology
2005
Abstract
4-Amino-2-chloroperbenzoic acid supported on silica gel was found to be a versatile and efficient oxidant for the oxidation of aldehydes and ketones to the corresponding carboxylic acids and esters. Copyright © Taylor & Francis, Inc
Efficient method for oxidation of ketones to esters with 4-aminoperoxybenzoic acid supported on silica gel
, Article Synthetic Communications ; Volume 38, Issue 12 , 2008 , Pages 2037-2042 ; 00397911 (ISSN) ; Hashemi, M. M ; Shahidi Zandi, M ; Sharif University of Technology
2008
Abstract
4-Aminoperoxybenzoic acid supported on silica gel was found to be a versatile and efficient oxidant for the oxidation of ketones to esters. Copyright © Taylor & Francis Group, LLC
Straightforward and highly efficient catalyst-free one-pot synthesis of dithiocarbamates under solvent-free conditions
, Article Organic Letters ; Volume 8, Issue 23, 9 November 2006, Pages 5275-5277 ; Aryanadab, F ; Saidi, M. R ; Sharif University of Technology
Abstract
A highly efficient and simple synthesis of dithiocarbamates is possible based on the one-pot reaction of amines, CS2, and alkyl halides without using a catalyst under solvent-free conditions. The mild reaction conditions, high yields, and broad scope of the reaction illustrate the good synthetic utility of this method. The reaction is a highly atom-economic process for production of S-alkyl thiocarbamates and successfully can be used in high quantities in the pharmaceutical or agrochemical industries
Manufacturing and structural evaluation of polymer derived sioc/tic and SiOC/TiC/mullite nanocomposites
, Article Iranian Journal of Materials Science and Engineering ; Volume 18, Issue 3 , 2021 ; 17350808 (ISSN) ; Godary, T ; Abdollahi, S ; Anousheh, M ; Khachatourian, A. M ; Sharif University of Technology
Iran University of Science and Technology
2021
Abstract
Silicon oxycarbide (SiOC) materials derived from silicone attracted great attention for their superior high-temperature behavior. In the present study, Si (Ti)OC and Si (Ti,Al)OC nanocomposites, in which alkoxide precursors were used with the main silicone precursor, have been compared with SiOC material. Although in SiOC, C was bonded with Si in a carbon-rich SiOC phase, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) showed that TiC was the preferred state for C atoms upon adding Ti into the system. This claim was also substantiated by Raman spectroscopy, where adding Ti into the system lowered the intensity of the D band, indicating the high affinity of C to...
Artificial neural network aided design of a multi-component catalyst for the steam reforming of methanol
, Article Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry ; Volume 44, Issue 1 , 2005 , Pages 64-66 ; 03764710 (ISSN) ; Gobal, F ; Sharif University of Technology
2005
Abstract
A neural network based on the feed forward back propagation error has been developed for the design and simulation of the catalytic properties of a multi-component system based on Cu-M-Al2O3 (M=Zn,Cr,Zr) for the steam reforming of methanol. Due to the limited size of the data set, cross validation method has to be used to enhance and also evaluate the prediction ability of the network. The best structural organization has been found to include 4,3,6,3 nodes in the input, two hidden layers and the output layer respectively
A cheap, simple, and versatile method for acetylation of alcohols and phenols and selective deprotection of aromatic acetates under solvent-free condition
, Article Synthetic Communications ; Volume 35, Issue 3 , 2005 , Pages 483-491 ; 00397911 (ISSN) ; Saidi, M. R ; Sharif University of Technology
2005
Abstract
Acyclic and cyclic acetates of various alcohols and phenols were obtained in excellent yields under mild reaction conditions in the presence of a catalytic amount of sodium hydroxide under solvent-free conditions and microwave irradiation. Selective deprotection of acetate group from the corresponding phenolic compounds was carried out in the presence of LiClO4· 2H2O. Copyright © Taylor & Francis, Inc
Water promoted Michael addition of secondary amines: To α,β- unsaturated carbonyl compounds under microwave irradiation
, Article Synthetic Communications ; Volume 30, Issue 4 , 2000 , Pages 643-650 ; 00397911 (ISSN) ; Mohammadi, M ; Hosseinnia, A ; Sharif University of Technology
Marcel Dekker Inc
2000
Abstract
A rapid Michael addition of secondary amines to α,β-unsaturated carbonyl compounds has been achieved in good to excellent yields in the presence of water under microwave irradiation. In the absence of water and under conventional method the reaction does not proceed or take place in very low yield after a long reaction time
ChemInform abstract: microwave-assisted rapid ketalization/acetalization of aromatic aldehydes and ketones in aqueous media [electronic resource]
, Article Journal of Chemical Research ; September 1999, Volume -, Number 9; Page(s) 562 to 563 ; Mirjalili, Bibi Fatemeh ; Sharif University of Technology
Abstract
Aromatic aldehydes and ketones are readily acetalized or ketalized under microwave irradiation in the presence of water as a solvent
Highly efficient and catalyst-free synthesis of unsymmetrical thioureas under solvent-free conditions
, Article Tetrahedron Letters ; Volume 50, Issue 1 , 2009 , Pages 32-34 ; 00404039 (ISSN) ; Pourshojaei, Y ; Saidi, M. R ; Sharif University of Technology
2009
Abstract
A highly efficient and simple synthesis of unsymmetrical thioureas is reported based on the reaction of readily synthesized dithiocarbamates with amines, without using any catalyst under solvent-free conditions. The short reaction time, high yields, and solvent-free conditions are advantages of this method. We did not observe the formation of any symmetric disubstituted thiourea, under these reaction conditions. © 2008 Elsevier Ltd. All rights reserved
A versatile one-pot synthesis of 2,3,5-tri-substituted thiophenes from thiomorpholides
, Article Tetrahedron Letters ; Volume 44, Issue 33 , 2003 , Pages 6253-6255 ; 00404039 (ISSN) ; Zali Boinee, H ; Sharif University of Technology
Elsevier Ltd
2003
Abstract
An efficient method for the preparation of 2,3,5-trisubstituted thiophenes in a one-pot synthesis from thiomorpholides via the thio-Claisen rearrangement was developed. © 2003 Elsevier Ltd. All rights reserved
Solvent-free three-component condensation reaction of aromatic ketones with aliphatic amines and formaldehyde
, Article Journal of Chemical Research - Part S ; Issue 8 , 2000 , Pages 380-381 ; 03082342 (ISSN) ; Saidi, M. R ; Sharifi, A ; Noushabadi, M ; Bolourtchian, M ; Sharif University of Technology
Scientific Reviews Ltd
2000
Abstract
A solvent-free procedure for the synthesis of several 1-aryl-2-(dialkylaminomethyl)-prop-2-en-1-ones 3 (a-e) and 4 (a-e) is reported. Reaction of arylmethyl ketones with formaldehyde and dialkylamines, such as diethyl- or dibutylamines at room temperature in silica gel produce 3 and 4 with moderate yields
Facile synthesis of highly substituted 2-pyrone derivatives via a tandem Knoevenagel condensation/lactonization reaction of β-formyl-esters and 1,3-cyclohexadiones
, Article Tetrahedron Letters ; Vol. 55, issue. 18 , April , 2014 , p. 2908-2911 ; ISSN: 00404039 ; Mirjafary, Z ; Javan, M. J ; Motamen, S ; Saeidian, H ; Sharif University of Technology
Abstract
A mild and efficient tandem process for the synthesis of new highly substituted 2-pyrones starting from commercially available 2-arylacetic acids has been developed. The synthesis is based on the Knoevenagel condensation of 1,3-cyclohexadiones with various β-formyl-esters, followed by lactonization in the presence of nano ZnO (20 mol %). Moderate to high yields and readily available cheap starting materials are the key features of the present method
A one-pot, three-component regiospecific synthesis of dispiropyrrolidines containing a thiophenone ring via 1,3-dipolar cycloaddition reactions of azomethine ylides
, Article Tetrahedron Letters ; Volume 54, Issue 20 , May , 2013 , Pages 2520-2524 ; 00404039 (ISSN) ; Khodabakhshi, M. R ; Ghahremannejad, Z ; Foroushani, B. K ; Ng, S. W ; Sharif University of Technology
2013
Abstract
The synthesis of new dispiropyrrolidines containing a thiophenone ring has been achieved by a one-pot, three-component 1,3-dipolar cycloaddition reaction. Unsaturated thiophenone dipolarophiles were reacted with azomethine ylides, generated in situ from sarcosine and cycloketone derivatives (isatin, ninhydrin, acenaphthoquinone), to produce the corresponding cycloadducts in good yields (70-90%). The cycloaddition reaction was found to be highly regio- and diastereoselective