OOIR: Observatory of International Research

Papers

(The median citation count of Organic Preparations and Procedures International is 1. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2022-01-01 to 2026-01-01.)

Article	Citations
H ₆ P ₂ W ₁₈ O ₆₂ ·18H ₂	29
Synthesis and Antiproliferative Evaluation of Novel 5-Substituted Pyridazin-4-Amine Derivatives	26
Copper (II)-immobilized on Starch-coated Nanomagnetite as an Efficient and Magnetically Recoverable Catalyst for the Synthesis of Propargylamines through One-pot A³ Coupling Reaction	20
Synthesis of 2,3-Dihydroquinazolinones via Condensation of 2-Aminobenzamides with Aldehydes under Ball Milling Conditions	20
Current Advances in Transition Metal-Free Access to Indoles. A Review	18
Facile Synthesis of Spirocyclic Oxindole Scaffolds via Intermolecular [4 + 1] Cycloaddition of ortho -Quinone Methides with 3-Chlorooxindoles	14
An Improved and Practical Synthesis of Vonoprazan	12
Microwave-Assisted Iodotrimethylsilane-Promoted Synthesis of Novel Pyrazolyl Chalcones	11
Catalytic Evaluation of Surface Engineered Activated Carbon with SnO ₂ Nanoparticles for Synthesis of Dihydropyrimidinones at Room Temperature	11
An Improved Method for Alcoholysis of Amides and Acid Hydrazides by Secondary Alcohols in the Presence of Triflic Acid	10
Design, Synthesis, and Insecticidal Activity of Novel Fipronil Derivatives Incorporating a Sulfide Unit	10
New Approach for the Synthesis and Purification of Spiro[fluorene-9,5’-[1,3]-dioxan]-2’-one	9
Rapid Synthesis of 3-Hydroxyflavones from 2’-Hydroxyacetophenones and Benzaldehydes	9
Development of an Efficient Alternative Synthesis of the Endothelin Receptor Antagonist Bosentan	8
Design and One-pot Synthesis of Novel Carbazole-based Thiazolone Imines	8
Eco-Friendly and Efficient Greener Process for the Synthesis of Chalcones and Pyrazolones Using the Supramolecular Catalyst β-Cyclodextrin	8
Magnetic Nanoparticle Supported Lewis Acidic Deep Eutectic Solvent (LADES@MNP) for the One-pot Synthesis of 14-Aryl-14- H -dibenzo[a,j]xanthenes	7
New Coumarin Derivatives as Cytotoxic Agents: Synthesis, in silico DNA-Binding Studies and MTT Assays in the MCF-7 Cell Line	7
An Organocatalytic Biogenic Approach for the Synthesis of Coumarins Using the Pechmann Condensation Reaction	7
An Original Transposition of the 4-Fluorobenzylamino Group from 1-(4-Fluorobenzylamino)-1-methylsulfanyl-2-nitroethylene in Triflic Acid^†	6
An Efficient and Practical Synthesis of Oseltamivir Phosphate	6
Efficient Synthesis of trans-3-Amino-1-methylcyclobutan-1-ol	6
Reinvestigating the Preparation of Glyoxime and Its Chlorination by a Slight Overpressure of Chlorine Gas to Prepare Dichloroglyoxime	6
Synthesis of Novel 1,4-Disubstituted Piperazines and Evaluation of Their Antibacterial Activities	5
Synthesis of Tetrahydrobenzo[b]pyrans Promoted by Sodium Stearate as a Lewis Base-Surfactant Combined Catalyst in an Aqueous Micellar Medium	5

A Rapid and Environmentally Benign Access to Hantzsch’s Polyhydroquinolines	5
Preparation of Thiazolidin-4-ones Using NiFe₂O₄@SiO₂ Grafted Propylsulfonic Acid as an Efficient Catalyst	5
Manganese (II) Chloride Tetrahydrate as an Efficient Catalyst for the Preparation of 5-Aryl-1 H -tetrazoles via [3 + 2] Cycloaddition of S	5
Recent Advances in 2-Aminobenzothiazole Chemistry: Catalysis in the Preparation of 1-(Benzothiazolylamino)methyl-2-naphthols. A Brief Review	5
Synthesis of 5-Methoxy-2-acetyl-1-naphthol	5
Preparation of 2,3-Diarylthiazolidin-4-one Derivatives Using Barium Sulfate Nano-Powders	5
Ultrasonic Assisted Mono-iodination of Activated Aromatics Using Iodine and Iodic Acid	5
Synthesis of Novel Substituted Guanidines and Pyrimidines Using Pyridinium and Methanaminium Salts in Water as a Green Solvent	5
A Novel and Rapid Method to Prepare Aminothiazoles	5
Melamine, a Recyclable Catalyst for the Synthesis of Dihydropyrano[2,3-c]pyrazoles in Aqueous Ethanol	5
Oxidative Cleavage of C=N Bond of Ketoximes with Singlet Molecular Oxygen Generated from trans- 5-Hydroperoxy-3,5-dimethyl-1,2-dioxolane-3-yl Ethaneperoxoate	4
Synthesis of Dihydropyrano[2,3- c ]pyrazoles with Trifluoroethanol as a Reusable Promoting Medium: A Green Protocol	4
Highly Stereoselective and Scalable Synthesis of Eldecalcitol	4
An Improved Procedure for the Synthesis of Amantadine Hydrochloride	4
Preparation and Biological Activities of Novel Tetra-arylidene Barbituric Acids Containing Ether Spacers	4
A Novel Green Approach to the Synthesis of bis-4-Hydroxycoumarins	4
Carboxymethyl Cellulose (CMC) as a Recyclable and Biodegradable Catalyst: A Greener Solvent-free Preparation of Pyrano[2,3- d ]pyrimidines	4
Contemporary Developments in the Transition-Metal Catalyzed Synthesis of Indoles. A Review	4
SbPh ₃ : An Efficient Catalyst for Dihydropyrimidinone and Dihydropyrimidin-5-carboxamide Synthesis Using the Biginelli Reaction	3
Synthesis of “Tablets Impurity” and “Impurity B” of Vigabatrin, an Antiepileptic Drug	3
Comparison of the Accelerating Effects of Two Ionic Liquids in the Oxidation of Alcohols	3
Application of Fe₃O₄@SiO₂-Propyl@dapsone-copper Complex Nanoparticles as a Magnetically Recoverable Catalyst for the Synthesis of Azo-linked andbis-Benzo[d]imid	3
Ammonium Acetate as an Efficient and Greener Catalyst for the Synthesis of 1 H -Pyrazolo[1,2- b ]phthalazine-5,10-diones in an Aqueous Med	3
Facile Preparation of 3,6-Dimethoxy-2-nitrobenzaldehyde	3
New and Convergent Synthesis of Deucravacitinib	3
Recent Synthetic Applications of Hypervalent Iodine Reagents. A Review in Three Installments: Installment I	3
Selective One-pot Synthesis of 2-Aryl-1-arylmethyl-1H-1,3-benzimidazoles in the Presence of Ammonium Persulfate and Their Antioxidant Activity	3
Greener Synthesis of Novel Azo-linked 1,2,4-Triazolidine-3-ones (thiones) Using Recyclable Fe ₃ O ₄ @SP@vanillin@thioglycolic Acid	3
Fluorophosphoric Acid Promoted Formation of Imines of Sulfonamides and Dihydropyridines at Room Temperature	3
A Recyclable Halide Perovskite Photocatalyst as a Single-electron Redox Mediator: Radical-initiated Gram-scale Photosynthesis of Pyrano[2,3 -d ]pyrimidines Induced by Vi	3
A Practical Green Synthesis of ( R )-5,7-difluorochroman-4-ol, a Key Intermediate of Tegoprazan	3
CAN Combined with NaI as Promoter System for the Synthesis of Novel Ethyl 1,2-Diarylpyrrolidine-3-carboxylate Derivatives via Three-Component Reaction	3
An Efficient Synthesis Process for 3,4-Dichloronitrobenzene Using the Solid Acid Catalyst SZT-0.15	3
One Pot Synthesis of Deterenol, a Sympathomimetic Ingredient of the Dietary Supplement Dexaprine	3
The Synthesis of gem-Bisamides Using a Carbocationic Catalytic System in Neutral Media	3
Functionalized Pyrimidines: Synthetic Approaches and Biological Activities. A Review	3
Synthesis of Novel 1,2,4-Triazole Derivatives of N-Benzyl-5-nitroisatin: Anticancer Activity, Anti-oxidant Activity, and Molecular Design	3
New and Convergent Synthesis of Finerenone	2
Sulfated Starch: A Highly Efficient Catalyst for Transamidation of Primary and Secondary Amines with Formamide and Acetamide	2
Design, Synthesis, Anticancer Evaluation and Molecular Docking Studies of Amide Derivatives of 1,3,4-Thiadiazolyl Pyridinyl Isoxazoles	2
A Greener Synthesis of N-( p -Toluenesulfonyl)imidazole Using the Bio-Renewable Solvent 2-MeTHF, Companion DFT Studies	2
An Alternate Feasible Route for the Synthesis of 4-Aminocoumarin	2
Multi-gram Preparation of 1-(3-Dimethylamino propyl)-3-ethylurea (EDU)	2
Recent Developments in Enantioselective Silver-Catalyzed Transformations	2
Mild Synthesis of Novel Azo-linked 4-Arylquinazoline-2,5( 3H , 6H )-diones and Azo-linked 4-Aryl-2-thioxoq	2
Synthesis of 3,4-Dihydropyrimidin-2-(1 H )-ones/thiones Catalyzed by Cetyltrimethylammonium Bromide (CTAB) in Aqueous Micellar Media: An Environmentally Responsible Proc	2
Development of a Novel and Scalable Process for the Synthesis of a Key Nafithromycin Intermediate	2
A Brief Review on the Synthesis of Pyrrolo[2,3-c]coumarins, including Lamellarin and Ningalin Scaffolds	2
Synthesis, Insecticidal Activity and DFT Study of 1,2,4-Triazolidinthione, 1,3,5-Oxadiazine and Thiourea Derivatives	2
Synthesis, Molecular Modeling, and Biological Evaluation of New N-(Benzo[d]thiazol-2-yl)-3-amino-but-2-enamide Derivatives as Cytotoxic Agents	2

Synthesis of Novel Amide Derivatives of the Sesquiterpene Aryl-himachalene	2
Natural Deep Eutectic Solvent as a Green Catalyst for the One-pot Synthesis of Chromene and 4H-Pyran Derivatives	2
Tartaric Acid as an Expeditious and Green Catalyst for the Synthesis of 1,2,4-Triazolidine-3-thiones in an Aqueous Medium	2
Eggshell/Kaolin Calcined System: An Efficient, Green, and Recoverable Catalyst for the One-Pot Biginelli Reaction	2
A Mild Synthetic Method for Selective Conversion of Camphene to Isoborneol Derivatives	2
Synthesis, Characterization, and Applications of Novel Pd-coated Magnetic Nano-particles. Identification of a Highly Effective Heterogeneous Catalyst for Tandem Ullmann Cross-coupling/Reductive-cycliz	2
An Efficient Synthesis of Novel 7-Aryl-1 H -[1,2,4]triazolo[1,5- a ][1,3,5]triazine-5-selones from Aroyl Chlorides, Potassium Selenocyanat	2
A Green, Facile, and Efficient Synthesis of 4H-Benzo[b]pyrans Using 2,2’-Bipyridine as a Recyclable Organocatalyst	2
Fe₃O₄@THAM-SO₃H as an Efficient Heterogeneous Magnetic Nanocatalyst to Access Functionalized Pyrrole and Polyhydroquinoline Derivatives	2
An Efficient Solvent-free Synthesis of Spiro-substituted Cyclopropanes by Grinding	2
Rapid Efficient Synthesis of 1,2,4-Triazolidine-3-Thiones in Aqueous Medium using Multiphase Bismuth Iron Oxide (mBFO) Catalyst	2
Preparation and Biological Evaluation of Thymol Functionalized 2-Pyrazoline and Dihydropyrimidinone Hybrids	2
Synthesis of 2-Amino-4-aryl Thiazoles using Cu-NP/C Heterogeneous Catalyst	2
Facile Synthesis of Novel Cylopenta[ b ]indoles and Their Biological Assessments	2
Curd Water as a Catalytic Solvent for the Preparation of bis -Coumarins	2
Guanidine Hydrochloride Catalyzed Efficient and Expeditious One-Pot Synthesis of 2, 4, 5-Triaryl Imidazole Derivatives	2
Design, Synthesis, and Evaluation of Novel 2-(4-Benzylideneamino)phenoxy)acetamides as Antibacterial Agents	2
A Concise Account of Synthetic Approaches to 1,2,3-Triazoles	2
Synthesis of N-Benzoyl-4-O-(1H-Tetrazol-5-yl)-L-Tyrosine Ethyl Ester: A Functionalized Tyrosine Derivative	2
Green Pathway for Solvent-free Synthesis of Tetrahydrobenzo[ b ]pyrans Promoted by Carboxymethyl Cellulose (CMC) as a Recyclable and Biodegradable Catalyst	2
Synthesis of Substituted N- (4 H -1,2,4-Triazol-4-yl)benzamides as Potential Antifungal Agents	1
Synthesis of Novel β-Lactams via Substitution Reactions of Thiolaryl Substituted β-Lactam Precursors	1
Green Approach for Metal-free One-pot Synthesis of Tetrahydrobenzo[b]pyrans with Sodium Alginate as a Reusable Bifunctional Biopolymeric Catalyst	1
Synthesis of Novel Quinolines with Antibacterial Activity	1
An Alternative Greener Synthesis of Dibenzalacetone	1
Alcoholysis of N -Substituted Amides and Carboxylic Acid Hydrazides in the Presence of Triflic Acid	1
Synthesis of Isoxazole-5(4 H )-ones Using Citrazinic Acid as an Organocatalyst in Aqueous Conditions	1
An Efficient Synthesis in Water of Novel Oxoquinolines and Their Anticancer Activities	1
An Efficient Synthesis of Curcumin Pyrazole Analogues and their Biological Activities	1
Cu(NO ₃ ) ₂ /HNO ₃ Oxidation of Chloromethyl-aryl-himachalene: Synthesis of a Novel Aldehyde De	1
Microwave-Assisted OPC-VH Mediated Synthesis of 2-Amino-1,3,4-thiadiazoles	1
Ru-based Cross Metathesis in the Synthesis of Glycosteroids	1
Visible Light Assisted Synthesis of Tetrahydrobenzo[ b ]pyrans Using 4CzIPN, a Carbazole-Based Photocatalyst	1
A Concise, Economical, and Eco-Friendly Two-Step Synthesis of 1-Adamantylamine Hydrochloride from Adamantane	1
1,2-Diaryl-4,5-diphenyl-1 H -imidazoles: Further Preparative Studies Using Amberlite IR120(H) as a Recyclable Heterogeneous Catalyst	1
Green Synthesis of 2-Amino-4 H -chromenes Using Sodium Stearate as a Lewis Base-surfactant Combined Catalyst (LBSC) in an Aqueous Micellar Medium	1
One-Pot Three-Component Synthesis of Novel 1-((4-Aminosulfonylphenyl)methyl)-5-aryl-4-benzoyl-3-hydroxy-3-pyrrolin-2-ones in Aqueous Media and Investigation of Their Antimicrobial Activity	1
Novel Synthesis of Multifunctionalized Spiro[benzofurancyclobutanes] via Aqueous Three-component Reaction Catalyzed by Theophylline	1
Emerging Approaches for Synthesis of 1,2,3-Triazole Derivatives. A Review	1
Rapid Access to Pyrano[2,3-d]pyrimidines Using Microwave Assisted [EMIM][OH] Catalysis	1
L-Proline Catalyzed Synthesis of Heterocycles: A Review	1
Efficient Synthesis of Xanthenediones Using CuCeO₂ Nanoparticle Catalyst in Aqueous Medium	1
Facile Synthesis of Substituted Pyrroles Using Silica Supported Catalysis	1
Copper Phthalocyanine Tetrasulfonic Acid, a Recyclable Solid Acid Catalyst for the Synthesis of Aryl Iodides and Azides from Aryl Amines via Diazotization	1
A New One-pot Synthesis of 4-Arylideneisoxazolones Catalyzed by Na ₂ SO ₃ in an Aqueous Medium	1
Synthesis of 3-Aryl-4-phenyl-1-selenoxo-1,4-dihydro-9-oxa-2,4-diaza-phenanthren-10-ones via a One-pot Reaction	1
An Efficient One-Pot Synthesis of 2-Aryl-4,5-diphenyl-1H-imidazoles with Amberlite IR-120(H) as a Reusable Heterogeneous Catalyst	1
Synthesis of Lithocholic Acid from Plant-sourced Bisnoralcohol	1
Three-component Domino Reaction in Aqueous Media for the Synthesis of New Indeno[1,2- b ]pyrroles and Pyrrole-fused Isocoumarins and a Study of Their Antibacterial Prope	1
Aluminized Polyborate: A New and Eco-friendly Catalyst for the Synthesis of SymmetricalN,N’-Di(aryl/alkyl)formamidines	1
A Novel Process for the Key Intermediate of Fluoroquinolones	1
Fe₃O₄@garlic peel-OSO₃H: Preparation, Characterization and Application as an Effective and Novel Nanocatalyst for One-Pot Synthesis of 2-Amino-3-phenylsulfonyl-4-aryl-	1
Synthesis of Pharma Europa Impurity-A of Flecainide Acetate	1
Catalyst-free On-Water Synthesis of 5-Aminopyrazole-4-carbonitriles as Potential Antifungal Agents	1
A Tris-Aldehyde Porphyrin Synthon: Synthesis and Characterization of 5,10,15-tris-(4’-(4-Formylphenoxy) propoxyphenyl)-20-(4-nitrophenyl)-porphyrin	1
Regioselective Benzylation of N-Boc-N’-COCF₃-protected Hydrazine	1