Search results for: Amitabha Sarkar

Items from 1 to 20 out of 37 results

article

Fuctionalization of Linear and Angular Phenothiazine and Phenoxazine Ring Systems via Pd(0)/XPhos Mediated Suzuki‐Miyaura Cross‐coupling Reactions

Efeturi A. Onoabedje, Uchechukwu C. Okoro, David W. Knight, Amitabha Sarkar

Journal of Heterocyclic Chemistry > 53 > 6 > 1787 - 1794

Chloro‐substituted phenothiazines and phenoxazines were successfully derivatized with phenylboronic and styrylboronic acids using Suzuki–Miyaura cross‐coupling reaction catalyzed by Pd(0)/XPhos for the first time in good yields. The protocol employed 4 mol% Pd and 7 mol% XPhos with K₃PO₄ in acetonitrile at 80°C. The reaction condition is compatible with carbonyl and unprotected N–H groups in substrates...

article

Fischer carbene mediated covalent grafting of a peptide nucleic acid on gold surfaces and IR optical detection of DNA hybridization with a transition metalcarbonyl label

Pratima Srivastava, Mahsa Ghasemi, Namrata Ray, Amitabha Sarkar, more

Applied Surface Science > 2016 > 385 > C > 47-55

Amine-reactive surfaces comprising N-hydroxysuccinimide ester groups as well as much more unusual Fischer alkoxymetallocarbene groups were generated on gold-coated surfaces via self-assembled monolayers of carboxy- and azido-terminated thiolates, respectively. These functions were further used to immobilize homothymine peptide nucleic acid (PNA) decamer in a covalent fashion involving the primary...

article

Steric vis-à-vis electronic influence of phosphines on biaryl motif: Ligand design for coupling reactions with Chloroarenes

Debajyoti Saha, Raju Ghosh, Ranjan Dutta, Achintya Kumar Mandal, more

Journal of Organometallic Chemistry > 2015 > 776 > C > 89-97

In order to assess relative contribution of steric factors and electron-richness of phosphine ligands on biaryl-type scaffolds, a set of 1-aryl-pyrazole/pyrrole derived ligands L1–L6 featuring either aryldicyclohexylphosphino or aryldiphenylphosphino donor group was synthesized. A bidentate coordination mode of ligands L1 or L2 was evident from a representative crystal structure that implied a possible...

article

Palladium catalyzed addition of arylboronic acid or indole to nitriles: synthesis of aryl ketones

Tuluma Das, Amarnath Chakraborty, Amitabha Sarkar

Tetrahedron Letters > 2014 > 55 > 52 > 7198-7202

Aryl ketones can be synthesized conveniently by a palladium catalyzed addition of arylboronic acid to nitriles in aqueous triflic acid. This catalytic system was extended to the addition of unprotected indoles to nitriles under a slightly modified condition to produce 3-acyl indoles in good yields.

article

Solvent control of product diversity in palladium-catalyzed addition of arylboronic acid to aryl aldehydes

Tuluma Das, Amarnath Chakraborty, Amitabha Sarkar

Tetrahedron Letters > 2014 > 55 > 37 > 5174-5178

In Pd-catalyzed arylboronic acid addition to aryl aldehydes, the expected carbinol or asymmetrical ether can be obtained as the major product by altering aqueous solvent composition. Exploiting this methodology with 2-formylbiphenyls as reaction partner, a fluorene scaffold can be readily constructed in two steps.

article

Single‐Step Formation of Graphene on Dielectric Surfaces

Wei Xiong, Yun Shen Zhou, Li Jia Jiang, Amitabha Sarkar, more

Advanced Materials > 25 > 4 > 630 - 634

The direct formation of graphene on various dielectric surfaces is successful via a single‐step rapid thermal processing (RTP) of substrates coated with amorphous carbon (C) and nickel (Ni) thin films. High‐quality graphene is obtained uniformly on the whole surface of wafers with a controlled number of graphene layers. The monolayer graphene exhibits a low sheet resistance and a high optical transmittance...

article

Palladium-Catalyzed Amination of Allyl Alcohols

Raju Ghosh, Amitabha Sarkar

The Journal of Organic Chemistry > 2011 > 76 > 20 > 8508 - 8512

article

Engineering Bioactive Surfaces with Fischer Carbene Complex: Protein A on Self-Assembled Monolayer for Antibody Sensing

Piyali Dutta, Sudeshna Sawoo, Namrata Ray, Othman Bouloussa, more

Bioconjugate Chemistry > 2011 > 22 > 6 > 1202 - 1209

article

A versatile approach for the immobilization of amines via copper-free “click” reaction between azido self-assembled monolayer and alkynyl Fischer carbene complex. Application to the detection of staphylococcal enterotoxin A antibody

Pratima Srivastava, Amitabha Sarkar, Sudeshna Sawoo, Amarnath Chakraborty, more

Journal of Organometallic Chemistry > 2011 > 696 > 5 > 1102-1107

A copper-free “click” reaction between an azido-terminated self-assembled monolayer (SAM) chemisorbed on planar gold-coated glass sensors and an alkynyl Fischer carbene complex yielded functionalized surfaces onto which facile and swift grafting of amine-containing molecules was achieved via aminolysis of the Fischer carbene moieties. The course of this process was conveniently monitored by Polarization-Modulation...

article

Regioselective 1,3-Dipolar Cycloaddition Reaction of Azides with Alkoxy Alkynyl Fischer Carbene Complexes

Amarnath Chakraborty, Surjendu Dey, Sudeshna Sawoo, N. N. Adarsh, more

Organometallics > 2010 > 29 > 23 > 6619 - 6622

article

Bidentate P, N−P Ligand for Nickel-Catalyzed Cross-Coupling of Aryl or Benzyl Chlorides with ArMgX

Raju Ghosh, Amitabha Sarkar

The Journal of Organic Chemistry > 2010 > 75 > 23 > 8283 - 8286

article

A Novel, Air-Stable Phosphine Ligand for the Palladium-Catalyzed Suzuki−Miyaura Cross-Coupling Reaction of Chloro Arenes

Raju Ghosh, N. N. Adarsh, Amitabha Sarkar

The Journal of Organic Chemistry > 2010 > 75 > 15 > 5320 - 5322

article

Pyrazole-tethered phosphine ligands for Pd(0): useful catalysts for Stille, Kumada and Hiyama cross-coupling reactions

Anwesha Pal, Raju Ghosh, N.N. Adarsh, Amitabha Sarkar

Tetrahedron > 2010 > 66 > 29 > 5451-5458

Combination of 3,5-dimethyl-1-(2-(diphenylphosphino)phenyl)-1H-pyrazole, A, and 3-tert-butyl-5-methyl-1-(2-(diphenylphosphino)phenyl)-1H-pyrazole, B, with Pd ₂ (dba) ₃ furnished excellent catalysts for Stille, Kumada and Hiyama cross-coupling reactions. Effects of solvents, bases and ligand/palladium ratio on efficiency of coupling reactions were studied. Molecular structures of palladium(II)...

article

Palladium Nanoparticle Catalyzed Hiyama Coupling Reaction of Benzyl Halides

Dipankar Srimani, Ansuman Bej, Amitabha Sarkar

The Journal of Organic Chemistry > 2010 > 75 > 12 > 4296 - 4299

article

Size controlled synthesis of Pd nanoparticles in water and their catalytic application in C–C coupling reactions

Sudeshna Sawoo, Dipankar Srimani, Piyali Dutta, Rima Lahiri, more

Tetrahedron > 2009 > 65 > 22 > 4367-4374

Catalytically active Pd nanoparticles have been synthesized in water by a novel reduction of Pd(II) with a Fischer carbene complex where polyethylene glycol (PEG) was used as stabilizer. PEG molecules wrap around the nanoparticles to impart stability and prevent agglomeration, yet leave enough surface area available on the nanoparticle for catalytic activity. Our method is superior to others in terms...

article

Benzaldimines as ligands for palladium in Suzuki–Miyaura reactions

Dipankar Srimani, Amitabha Sarkar

Tetrahedron Letters > 2008 > 49 > 44 > 6304-6307

Schiff bases derived from substituted benzaldehydes are effective ligands for palladium(0) in the Suzuki–Miyaura coupling of phenylboronic acid with aryl, benzyl and allyl bromides under mild conditions.

article

Convenient Synthesis of Palladium Nanoparticles and Catalysis of Hiyama Coupling Reaction in Water

Dipankar Srimani, Sudeshna Sawoo, Amitabha Sarkar

Organic Letters > 2007 > 9 > 18 > 3639 - 3642

article

Imprints of Himalayan thrust tectonics on the Quaternary piedmont sediments of the Neora–Jaldhaka Valley, Darjeeling–Sikkim Sub-Himalayas, India

Dipayan Guha, Sandeep Bardhan, Shaikh Rezaul Basir, Adhip Kanti De, more

Journal of Asian Earth Sciences > 2007 > 30 > 3-4 > 464-473

Geological mapping in the Neora–Jaldhaka Valley of the Darjeeling–Sikkim Sub-Himalayan foothill region reveals the presence of discontinuous strands of tectonically active Quaternary thrust faults. The zones of active faulting coincide with occurrences of deeply incised piedmont deposits and river terraces along an E–W trending corridor. In order of younging, the successive Quaternary thrust faults...

article

Synthesis of hydrophilic Fischer carbene complexes as organometallic marker and PEGylating agent for proteins

Debasis Samanta, Sudeshna Sawoo, Subrata Patra, Manju Ray, more

Journal of Organometallic Chemistry > 2005 > 690 > 24-25 > 5581-5590

Syntheses of Fischer carbene complexes with various hydrophilic tethers (4, 6a, 6b, 6c, 8a, 8b, 14a, 14b, 15 and 19) are described. The water-soluble carbene complex, 14b, was used to label and pegylate bovine serum albumin (BSA) without affecting its conformation. The red complex, 19, underwent a sharp color change to yellow on reaction with BSA, a feature that is potentially useful for developing...

article

Synthesis, structure, electrochemistry and ROMP-activity of new ferrocenyl analog of Grubbs’ metathesis catalyst

Tarun K. Maishal, Biplab Mondal, Vedavati G. Puranik, Prakash P. Wadgaonkar, more

Journal of Organometallic Chemistry > 2005 > 690 > 4 > 1018-1027

Treatment of [(PCy ₃ ) ₂ Cl ₂ RuCH–Ph] (I) with vinylferrocene 1 and 1-ferrocenyl-1,3-butadiene 2 yielded solid products. These new complexes were characterized by ¹ H NMR, ³¹ P NMR and ¹³ C NMR spectroscopy. X-ray crystal structures of both the complexes have been solved. The crystal structure of II confirmed the assigned structure and revealed existence...

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Keywords

PALLADIUM (4)
SUZUKI COUPLING (3)
ADDITION REACTION (2)
FISCHER CARBENE (2)
FISCHER CARBENE COMPLEX (2)
MOLYBDENUM (2)
PYRAZOLE (2)
SELF-ASSEMBLED MONOLAYER (2)
2-HYDROXYPHENYL-BIS(3,5-DIMETHYLPYRAZOLYL)METHANE (1)
3-ACYL-INDOLE (1)
ALKENE METATHESIS (1)
ALLYL (1)
ANNULATION (1)
ANTIBODY–ANTIGEN RECOGNITION (1)
ARENE CHROMIUM COMPLEXES (1)
ARENE–TRICARBONYL COMPLEXES (1)
ARYL CARBOXAMIDES (1)
ARYL CHLORIDE (1)
ARYL KETONE (1)
AZIDE-ALKYNE CYCLOADDITION (1)
BENZANNULATION (1)
BIOORGANOMETALLICS (1)
BISOXAZOLINE (1)
CARBENE (1)
CARBINOL (1)
CARBYNE COMPLEXES (1)
CHALCOGEN (1)
CHALCOGENS (1)
CLUSTER (1)
CLUSTERS (1)
CONJUGATE ADDITION (1)
COORDINATION POLYMER (1)
CROSS-COUPLING REACTION (1)
CRYSTAL STRUCTURE (1)
C–C COUPLING (1)
DARJEELING–SIKKIM SUB-HIMALAYAS (1)
ELECTROCHEMISTRY (1)
ENDO-SELECTIVITY (1)
FERROCENE (1)
FISCHER CARBENE COMPLEXES (1)
FISCHER-TYPE CARBENE COMPLEX (1)
FISHER CARBENE (1)
FLUORENE (1)
GENOSENSOR (1)
GRAPHENE (1)
HIYAMA COUPLING (1)
IRON (1)
MAIN FRONTAL THRUST (MFT) (1)
METAL ION COMPLEXES OF (1)
METATHESIS (1)
N,N-DONOR SYSTEM (1)
NI EVAPORATION (1)
NI3C (1)
NON-COVALENT INTERACTION (1)
NUCLEAR MAGNETIC RESONANCE (1)
OPTICALLY PURE (1)
PALLADIUM COMPLEX (1)
PD (1)
PD NANOPARTICLE (1)
PEG (1)
PEGYLATION (1)
PEPTIDE NUCLEIC ACID (1)
PHOSPHINE (1)
PHOSPHINE LIGAND (1)
PM-IRRAS (1)
PM-RAIRS (1)
PROTEIN LABELLING (1)
PYRAZDE (1)
PYRAZOLYL-BASED PHOSPHINE LIGANDS (1)
PYRAZOLYLPYRIDINE (1)
QUATERNARY ACTIVE TECTONICS (1)
RADIOCARBON DATING (1)
RAPID THERMAL ANNEALING (1)
RING CLOSING METATHESIS CATALYSIS (1)
RING-OPENING METATHESIS POLYMERIZATION (1)
RING-OPENING METATHETIC POLYMERIZATION (ROMP) (1)
RUTHENIUM CARBENE (1)
SCHIFFS BASE (1)
SINGLE-ELECTRON TRANSFER (1)
STILLE, KUMADA, HIYAMA (1)
SYMMETRICAL ETHER (1)
TANSFER‐FREE GROWTH (1)
THERMALLY STABLE (1)
TRIBUTYLSTANNYLLITHIUM (1)
WATER (1)
WATER-SOLUBLE FISCHER CARBENE COMPLEX (1)
X-RAY CRYSTAL STRUCTURES (1)
X-RAY DIFFRACTION (1)
“CLICK” REACTION (1)
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Data set

Elsevier (28)
ACS (7)
Wiley (2)

Journal

Journal of Organometallic Chemistry (11)
Tetrahedron Letters (10)
The Journal of Organic Chemistry (4)
Tetrahedron (3)
Advanced Materials (1)
Applied Surface Science (1)
Bioconjugate Chemistry (1)
Coordination Chemistry Reviews (1)
Inorganica Chimica Acta (1)
Journal of Asian Earth Sciences (1)
Journal of Heterocyclic Chemistry (1)
Organic Letters (1)
Organometallics (1)
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INFONA - science communication portal

Search results for: Amitabha Sarkar

Fuctionalization of Linear and Angular Phenothiazine and Phenoxazine Ring Systems via Pd(0)/XPhos Mediated Suzuki‐Miyaura Cross‐coupling Reactions

Fischer carbene mediated covalent grafting of a peptide nucleic acid on gold surfaces and IR optical detection of DNA hybridization with a transition metalcarbonyl label

Steric vis-à-vis electronic influence of phosphines on biaryl motif: Ligand design for coupling reactions with Chloroarenes

Palladium catalyzed addition of arylboronic acid or indole to nitriles: synthesis of aryl ketones

Solvent control of product diversity in palladium-catalyzed addition of arylboronic acid to aryl aldehydes

Single‐Step Formation of Graphene on Dielectric Surfaces

Palladium-Catalyzed Amination of Allyl Alcohols

Engineering Bioactive Surfaces with Fischer Carbene Complex: Protein A on Self-Assembled Monolayer for Antibody Sensing

A versatile approach for the immobilization of amines via copper-free “click” reaction between azido self-assembled monolayer and alkynyl Fischer carbene complex. Application to the detection of staphylococcal enterotoxin A antibody

Regioselective 1,3-Dipolar Cycloaddition Reaction of Azides with Alkoxy Alkynyl Fischer Carbene Complexes

Bidentate P, N−P Ligand for Nickel-Catalyzed Cross-Coupling of Aryl or Benzyl Chlorides with ArMgX

A Novel, Air-Stable Phosphine Ligand for the Palladium-Catalyzed Suzuki−Miyaura Cross-Coupling Reaction of Chloro Arenes

Pyrazole-tethered phosphine ligands for Pd(0): useful catalysts for Stille, Kumada and Hiyama cross-coupling reactions

Palladium Nanoparticle Catalyzed Hiyama Coupling Reaction of Benzyl Halides

Size controlled synthesis of Pd nanoparticles in water and their catalytic application in C–C coupling reactions

Benzaldimines as ligands for palladium in Suzuki–Miyaura reactions

Convenient Synthesis of Palladium Nanoparticles and Catalysis of Hiyama Coupling Reaction in Water

Imprints of Himalayan thrust tectonics on the Quaternary piedmont sediments of the Neora–Jaldhaka Valley, Darjeeling–Sikkim Sub-Himalayas, India

Synthesis of hydrophilic Fischer carbene complexes as organometallic marker and PEGylating agent for proteins

Synthesis, structure, electrochemistry and ROMP-activity of new ferrocenyl analog of Grubbs’ metathesis catalyst

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