The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Krishnacharya G. Akamanchi - One of the best experts on this subject based on the ideXlab platform.
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Sulfated tungstate: An efficient catalyst for synthesis of thioamides via Kindler Reaction
Applied Catalysis A-general, 2012Co-Authors: Sagar P. Pathare, Pramod S. Chaudhari, Krishnacharya G. AkamanchiAbstract:Abstract New application of sulfated tungstate, a mildly acidic solid inorganic acid, as reusable heterogeneous catalyst for efficient Kindler Reaction, a three component Reactions of aldehydes, amines and sulfur, for synthesis of thioamides is discussed.
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sulfated tungstate a green catalyst for synthesis of thiomorpholides via willgerodt Kindler Reaction
Catalysis Communications, 2011Co-Authors: Suresh D. Salim, Sagar P. Pathare, Krishnacharya G. AkamanchiAbstract:Abstract Use of sulfated tungstate as an efficient, green and reusable catalyst for preparation of thiomorpholides via Willgerodt–Kindler Reaction pathway is presented. The Reaction proceeds under solvent free condition. The advantages of this method are high yields, short Reaction times, ease of product isolation and recyclability of catalyst for a number of times without significant loss of activity.
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Sulfated tungstate: A green catalyst for synthesis of thiomorpholides via Willgerodt–Kindler Reaction
Catalysis Communications, 2011Co-Authors: Suresh D. Salim, Sagar P. Pathare, Krishnacharya G. AkamanchiAbstract:Abstract Use of sulfated tungstate as an efficient, green and reusable catalyst for preparation of thiomorpholides via Willgerodt–Kindler Reaction pathway is presented. The Reaction proceeds under solvent free condition. The advantages of this method are high yields, short Reaction times, ease of product isolation and recyclability of catalyst for a number of times without significant loss of activity.
Kioumars Aghapoor - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and structure of 2,6-bis(2-methoxyphenyl)dithiazolo[4,5-b:5′,4′-e]pyridine) as a novel fluorescent sensor: different recognition of transition metal ions and proton
Tetrahedron Letters, 2016Co-Authors: Hossein Reza Darabi, Kioumars Aghapoor, Maryam Kargar, Roghayeh Hajipoor, Negar Abouali, Khosrow Jadidi, Behrouz Notash, Hani SayahiAbstract:The fluorophore 2,6-bis(2-methoxyphenyl)dithiazolo[4,5- b :5′,4′- e ]pyridine) 3 , with a planar structure, was synthesized using a one-pot Willgerodt–Kindler Reaction which is potentially applicable to various dithiazolopyridines. The basic photophysical characteristics were investigated in organic solvents of different polarity. Chemosensor 3 exhibits a ‘turn-off’ response toward Cu 2+ and Fe 3+ ions, as well as a new emission wavelength-ratiometric response to H + ions, illustrating a different recognition manner. From the binding constant calculations of 3 with Cu 2+ , increased sensitivity for the fluorescence method over that of the UV–vis method was found, while both methods showed similar sensitivity for binding of 3 with H + . On the other hand, the different behavior in the complexes of 3 ·H + and 3 ·Cu 2+ under cyclic voltammetric analysis was observed. These findings suggest that compound 3 may have potential as a sensor for water pollution by Cu 2+ and Fe 3+ ions as well as protons.
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A new protocol for the carboxylic acid sidewall functionalization of single-walled carbon nanotubes
Applied Surface Science, 2012Co-Authors: Hossein Reza Darabi, Kioumars Aghapoor, Farshid Mohsenzadeh, Mohammad Jafar Tehrani, Rasoul MalekfarAbstract:Abstract The carboxylic acid termination of the single-walled carbon nanotubes (SWNTs) provides a convenient link for covalent bonding between the SWNTs and polymer or biological systems. In this work, two approaches for covalent attachment of carboxylic acid groups to the side-walls of single walled carbon nanotubes are presented. Both protocols are based on chemical manipulation of benzonitrile residues, easily introduced onto the SWNTs by in situ diazonium salt formation of 4-aminobenzonitrile. In the first approach, benzonitrile groups on SWNTs were treated with aq. NaOH solution to form benzoic acid moieties. The second approach on benzonitrile groups is leaded to the formation of benzothiomorpholides via Willgerodt–Kindler Reaction which is then converted to benzoic acid moieties on SWNTs. Moreover, a simple one-pot entry into the formation of benzoic acid moieties is presented. SWNTs were characterized by a set of methods including FT-IR, UV/vis, TGA, SEM and Raman techniques. The presence of thioamide groups on SWNT is also proved directly by XPS spectroscopy.
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thioamidation of single walled carbon nanotubes a new chemical functionalization protocol by the willgerodt Kindler Reaction
Australian Journal of Chemistry, 2009Co-Authors: Hossein Reza Darabi, Kioumars Aghapoor, Farshid Mohsenzadeh, Shabnam Mohandessi, Mohammad Hashemi Karouei, Fatemeh Tahoori, Rainer HergesAbstract:A new and convenient method for covalent attachment of thioamide groups to the side-walls of carbon nanotubes (SWNT) via the Willgerodt–Kindler (WK) Reaction is presented. Treating SWNTs with 4-acetylaniline and subsequently with morpholine as a secondary amine and sulfur leads to the thioamidation of SWNTs. This approach paves the way for a new chemical functionalization protocol to enhance the potential of SWNTs for further chemical Reactions applicable in various fields.
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Thioamidation of Single-Walled Carbon Nanotubes: a New Chemical Functionalization Protocol by the Willgerodt―Kindler Reaction
Australian Journal of Chemistry, 2009Co-Authors: Hossein Reza Darabi, Kioumars Aghapoor, Farshid Mohsenzadeh, Shabnam Mohandessi, Mohammad Hashemi Karouei, Fatemeh Tahoori, Rainer HergesAbstract:A new and convenient method for covalent attachment of thioamide groups to the side-walls of carbon nanotubes (SWNT) via the Willgerodt–Kindler (WK) Reaction is presented. Treating SWNTs with 4-acetylaniline and subsequently with morpholine as a secondary amine and sulfur leads to the thioamidation of SWNTs. This approach paves the way for a new chemical functionalization protocol to enhance the potential of SWNTs for further chemical Reactions applicable in various fields.
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Synthesis of 1,n-Acyloxy Thioamides by the Willgerodt-Kindler Reaction: Chemoselectivity of 1,3-Ketoesters over 1,3-Diketones
Zeitschrift für Naturforschung B, 2008Co-Authors: Hossein Reza Darabi, Kioumars Aghapoor, Yadollah Balavar, Elham Mobedi, Hossein Farhangian, Farshid MohsenzadehAbstract:Treatment of selected types of 1,3-ketoesters and their corresponding enamines by the Willgerodt- Kindler (WK) Reaction afforded the corresponding 1,n-acyloxy thioamides. Based on the mechanistic study, the chemoselective thioamidation of 1,3-ketoesters occurs in the presence of 1,3-diketones.
Hossein Reza Darabi - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and structure of 2,6-bis(2-methoxyphenyl)dithiazolo[4,5-b:5′,4′-e]pyridine) as a novel fluorescent sensor: different recognition of transition metal ions and proton
Tetrahedron Letters, 2016Co-Authors: Hossein Reza Darabi, Kioumars Aghapoor, Maryam Kargar, Roghayeh Hajipoor, Negar Abouali, Khosrow Jadidi, Behrouz Notash, Hani SayahiAbstract:The fluorophore 2,6-bis(2-methoxyphenyl)dithiazolo[4,5- b :5′,4′- e ]pyridine) 3 , with a planar structure, was synthesized using a one-pot Willgerodt–Kindler Reaction which is potentially applicable to various dithiazolopyridines. The basic photophysical characteristics were investigated in organic solvents of different polarity. Chemosensor 3 exhibits a ‘turn-off’ response toward Cu 2+ and Fe 3+ ions, as well as a new emission wavelength-ratiometric response to H + ions, illustrating a different recognition manner. From the binding constant calculations of 3 with Cu 2+ , increased sensitivity for the fluorescence method over that of the UV–vis method was found, while both methods showed similar sensitivity for binding of 3 with H + . On the other hand, the different behavior in the complexes of 3 ·H + and 3 ·Cu 2+ under cyclic voltammetric analysis was observed. These findings suggest that compound 3 may have potential as a sensor for water pollution by Cu 2+ and Fe 3+ ions as well as protons.
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A new protocol for the carboxylic acid sidewall functionalization of single-walled carbon nanotubes
Applied Surface Science, 2012Co-Authors: Hossein Reza Darabi, Kioumars Aghapoor, Farshid Mohsenzadeh, Mohammad Jafar Tehrani, Rasoul MalekfarAbstract:Abstract The carboxylic acid termination of the single-walled carbon nanotubes (SWNTs) provides a convenient link for covalent bonding between the SWNTs and polymer or biological systems. In this work, two approaches for covalent attachment of carboxylic acid groups to the side-walls of single walled carbon nanotubes are presented. Both protocols are based on chemical manipulation of benzonitrile residues, easily introduced onto the SWNTs by in situ diazonium salt formation of 4-aminobenzonitrile. In the first approach, benzonitrile groups on SWNTs were treated with aq. NaOH solution to form benzoic acid moieties. The second approach on benzonitrile groups is leaded to the formation of benzothiomorpholides via Willgerodt–Kindler Reaction which is then converted to benzoic acid moieties on SWNTs. Moreover, a simple one-pot entry into the formation of benzoic acid moieties is presented. SWNTs were characterized by a set of methods including FT-IR, UV/vis, TGA, SEM and Raman techniques. The presence of thioamide groups on SWNT is also proved directly by XPS spectroscopy.
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thioamidation of single walled carbon nanotubes a new chemical functionalization protocol by the willgerodt Kindler Reaction
Australian Journal of Chemistry, 2009Co-Authors: Hossein Reza Darabi, Kioumars Aghapoor, Farshid Mohsenzadeh, Shabnam Mohandessi, Mohammad Hashemi Karouei, Fatemeh Tahoori, Rainer HergesAbstract:A new and convenient method for covalent attachment of thioamide groups to the side-walls of carbon nanotubes (SWNT) via the Willgerodt–Kindler (WK) Reaction is presented. Treating SWNTs with 4-acetylaniline and subsequently with morpholine as a secondary amine and sulfur leads to the thioamidation of SWNTs. This approach paves the way for a new chemical functionalization protocol to enhance the potential of SWNTs for further chemical Reactions applicable in various fields.
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Thioamidation of Single-Walled Carbon Nanotubes: a New Chemical Functionalization Protocol by the Willgerodt―Kindler Reaction
Australian Journal of Chemistry, 2009Co-Authors: Hossein Reza Darabi, Kioumars Aghapoor, Farshid Mohsenzadeh, Shabnam Mohandessi, Mohammad Hashemi Karouei, Fatemeh Tahoori, Rainer HergesAbstract:A new and convenient method for covalent attachment of thioamide groups to the side-walls of carbon nanotubes (SWNT) via the Willgerodt–Kindler (WK) Reaction is presented. Treating SWNTs with 4-acetylaniline and subsequently with morpholine as a secondary amine and sulfur leads to the thioamidation of SWNTs. This approach paves the way for a new chemical functionalization protocol to enhance the potential of SWNTs for further chemical Reactions applicable in various fields.
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Synthesis of 1,n-Acyloxy Thioamides by the Willgerodt-Kindler Reaction: Chemoselectivity of 1,3-Ketoesters over 1,3-Diketones
Zeitschrift für Naturforschung B, 2008Co-Authors: Hossein Reza Darabi, Kioumars Aghapoor, Yadollah Balavar, Elham Mobedi, Hossein Farhangian, Farshid MohsenzadehAbstract:Treatment of selected types of 1,3-ketoesters and their corresponding enamines by the Willgerodt- Kindler (WK) Reaction afforded the corresponding 1,n-acyloxy thioamides. Based on the mechanistic study, the chemoselective thioamidation of 1,3-ketoesters occurs in the presence of 1,3-diketones.
Sagar P. Pathare - One of the best experts on this subject based on the ideXlab platform.
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Sulfated tungstate: An efficient catalyst for synthesis of thioamides via Kindler Reaction
Applied Catalysis A-general, 2012Co-Authors: Sagar P. Pathare, Pramod S. Chaudhari, Krishnacharya G. AkamanchiAbstract:Abstract New application of sulfated tungstate, a mildly acidic solid inorganic acid, as reusable heterogeneous catalyst for efficient Kindler Reaction, a three component Reactions of aldehydes, amines and sulfur, for synthesis of thioamides is discussed.
-
sulfated tungstate a green catalyst for synthesis of thiomorpholides via willgerodt Kindler Reaction
Catalysis Communications, 2011Co-Authors: Suresh D. Salim, Sagar P. Pathare, Krishnacharya G. AkamanchiAbstract:Abstract Use of sulfated tungstate as an efficient, green and reusable catalyst for preparation of thiomorpholides via Willgerodt–Kindler Reaction pathway is presented. The Reaction proceeds under solvent free condition. The advantages of this method are high yields, short Reaction times, ease of product isolation and recyclability of catalyst for a number of times without significant loss of activity.
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Sulfated tungstate: A green catalyst for synthesis of thiomorpholides via Willgerodt–Kindler Reaction
Catalysis Communications, 2011Co-Authors: Suresh D. Salim, Sagar P. Pathare, Krishnacharya G. AkamanchiAbstract:Abstract Use of sulfated tungstate as an efficient, green and reusable catalyst for preparation of thiomorpholides via Willgerodt–Kindler Reaction pathway is presented. The Reaction proceeds under solvent free condition. The advantages of this method are high yields, short Reaction times, ease of product isolation and recyclability of catalyst for a number of times without significant loss of activity.
Suresh D. Salim - One of the best experts on this subject based on the ideXlab platform.
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sulfated tungstate a green catalyst for synthesis of thiomorpholides via willgerodt Kindler Reaction
Catalysis Communications, 2011Co-Authors: Suresh D. Salim, Sagar P. Pathare, Krishnacharya G. AkamanchiAbstract:Abstract Use of sulfated tungstate as an efficient, green and reusable catalyst for preparation of thiomorpholides via Willgerodt–Kindler Reaction pathway is presented. The Reaction proceeds under solvent free condition. The advantages of this method are high yields, short Reaction times, ease of product isolation and recyclability of catalyst for a number of times without significant loss of activity.
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Sulfated tungstate: A green catalyst for synthesis of thiomorpholides via Willgerodt–Kindler Reaction
Catalysis Communications, 2011Co-Authors: Suresh D. Salim, Sagar P. Pathare, Krishnacharya G. AkamanchiAbstract:Abstract Use of sulfated tungstate as an efficient, green and reusable catalyst for preparation of thiomorpholides via Willgerodt–Kindler Reaction pathway is presented. The Reaction proceeds under solvent free condition. The advantages of this method are high yields, short Reaction times, ease of product isolation and recyclability of catalyst for a number of times without significant loss of activity.
