Subtopic Deep Dive
Transition-Metal-Catalyzed Thiolation Reactions
Research Guide
What is Transition-Metal-Catalyzed Thiolation Reactions?
Transition-metal-catalyzed thiolation reactions form C-S bonds between thiols and aryl/alkyl halides using palladium or copper catalysts with optimized ligands and conditions.
These reactions enable efficient synthesis of thioethers from cross-coupling of thiols with halides. Beletskaya and Ananikov (2011) reviewed Pd- and Cu-catalyzed C-S formations with 1631 citations. Applications span pharmaceuticals and materials requiring sulfur linkages.
Why It Matters
Thioethers from these reactions serve as key intermediates in drugs like sartans and thioether-based polymers for electronics. Beletskaya and Ananikov (2011) highlight scalable C-S couplings reducing waste in industrial synthesis. Modha et al. (2013) show C-S cleavage extensions for C-C bonds in complex molecule assembly, impacting agrochemical production.
Key Research Challenges
Ligand Optimization
Developing ligands for broad substrate scope remains difficult due to catalyst deactivation by thiols. Beletskaya and Ananikov (2011) note phosphine ligands suffer oxidation. Recent advances seek air-stable alternatives.
Mechanistic Uncertainties
Oxidative addition and transmetalation steps vary by metal, complicating prediction. Modha et al. (2013) discuss C-S activation pathways. Verification requires spectroscopic studies.
Scalability Barriers
High catalyst loadings hinder industrial use despite high yields. Beletskaya and Ananikov (2011) report gram-scale limits from impurity buildup. Greener solvents needed.
Essential Papers
Transition-Metal-Catalyzed C−S, C−Se, and C−Te Bond Formation via Cross-Coupling and Atom-Economic Addition Reactions
I. P. Beletskaya, Valentine P. Ananikov · 2011 · Chemical Reviews · 1.6K citations
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTTransition-Metal-Catalyzed C−S, C−Se, and C−Te Bond Formation via Cross-Coupling and Atom-Economic Addition ReactionsIrina P. Beletskaya*‡ and Valentine P...
Electrifying Organic Synthesis
Anton Wiebe, Tile Gieshoff, Sabine Möhle et al. · 2018 · Angewandte Chemie International Edition · 1.4K citations
Abstract The direct synthetic organic use of electricity is currently experiencing a renaissance. More synthetically oriented laboratories working in this area are exploiting both novel and more tr...
Synthetic applications of eosin Y in photoredox catalysis
Durga Prasad Hari, Burkhard König · 2014 · Chemical Communications · 1.0K citations
Eosin Y, a long known dye molecule, has recently been widely applied as a photoredox catalyst in organic synthesis.
Electrochemical strategies for C–H functionalization and C–N bond formation
Markus D. Kärkäs · 2018 · Chemical Society Reviews · 959 citations
This review provides an overview of the use of electrochemistry as an appealing platform for expediting carbon–hydrogen functionalization and carbon–nitrogen bond formation.
Mechanistic Studies in Photocatalysis
Luca Buzzetti, Giacomo E. M. Crisenza, Paolo Melchiorre · 2018 · Angewandte Chemie International Edition · 893 citations
Abstract The fast‐moving fields of photoredox and photocatalysis have recently provided fresh opportunities to expand the potential of synthetic organic chemistry. Advances in light‐mediated proces...
Photochemical Nickel-Catalyzed C–H Arylation: Synthetic Scope and Mechanistic Investigations
Drew R. Heitz, John C. Tellis, Gary A. Molander · 2016 · Journal of the American Chemical Society · 505 citations
An iridium photocatalyst and visible light facilitate a room temperature, nickel-catalyzed coupling of (hetero)aryl bromides with activated α-heterosubstituted or benzylic C(sp<sup>3</sup>)-H bonds...
Organic synthetic transformations using organic dyes as photoredox catalysts
Shunichi Fukuzumi, Kei Ohkubo · 2014 · Organic & Biomolecular Chemistry · 470 citations
This review article presents various photocatalytic transformation such as oxygenation, halogenation and C–C bond formation with organic photoredox catalysts.
Reading Guide
Foundational Papers
Start with Beletskaya and Ananikov (2011, 1631 citations) for comprehensive C-S mechanisms and examples; then Modha et al. (2013) for cleavage applications.
Recent Advances
Hari and König (2014, 1025 citations) on eosin Y photoredox aiding metal catalysis; Heitz et al. (2016, 505 citations) for Ni/photochemical hybrids.
Core Methods
Pd-catalyzed with bidentate phosphines (Xantphos, DPEphos); Cu with diamines (trans-1,2-cyclohexanediamine); monitored by GC-MS, NMR.
How PapersFlow Helps You Research Transition-Metal-Catalyzed Thiolation Reactions
Discover & Search
Research Agent uses searchPapers('Transition-Metal-Catalyzed Thiolation Reactions') to retrieve Beletskaya and Ananikov (2011) with 1631 citations, then citationGraph to map 500+ citing works on Pd/Cu systems, and findSimilarPapers for ligand innovations.
Analyze & Verify
Analysis Agent applies readPaperContent on Beletskaya and Ananikov (2011) to extract mechanistic schemes, verifyResponse with CoVe against 10 similar reviews for accuracy, and runPythonAnalysis to plot yield vs. catalyst loading from extracted tables using pandas, with GRADE scoring evidence strength.
Synthesize & Write
Synthesis Agent detects gaps in earth-abundant catalysts via contradiction flagging across reviews, while Writing Agent uses latexEditText for reaction schemes, latexSyncCitations for 50+ refs, and latexCompile to generate publication-ready sections with exportMermaid for catalytic cycle diagrams.
Use Cases
"Extract reaction conditions from thiolation papers and analyze yields statistically"
Research Agent → searchPapers → Analysis Agent → readPaperContent (10 papers) → runPythonAnalysis (pandas yield histogram, matplotlib plot) → researcher gets CSV of optimized Pd/Cu conditions with stats.
"Write LaTeX review section on Cu-catalyzed thiolations with citations"
Synthesis Agent → gap detection → Writing Agent → latexEditText (draft text) → latexSyncCitations (Beletskaya 2011 et al.) → latexCompile → researcher gets PDF with schemes and bibliography.
"Find open-source codes for thiolation reaction modeling"
Research Agent → searchPapers → paperExtractUrls → Code Discovery → paperFindGithubRepo → githubRepoInspect → researcher gets DFT simulation scripts for C-S bond energies.
Automated Workflows
Deep Research workflow scans 50+ papers on thiolation via searchPapers → citationGraph → structured report with yields and scopes. DeepScan applies 7-step CoVe analysis to Beletskaya (2011) mechanisms with GRADE checkpoints. Theorizer generates hypotheses on Ni alternatives from photoredox trends in Hari and König (2014).
Frequently Asked Questions
What defines transition-metal-catalyzed thiolation reactions?
Pd- or Cu-catalyzed C-S cross-couplings of thiols with aryl/alkyl halides using ligands like Xantphos. Beletskaya and Ananikov (2011) cover mechanisms and scopes.
What are common methods?
Buchwald-Hartwig-type couplings with Pd2(dba)3 and dppf for aryl thiols; CuI with 1,10-phen for alkyl. Optimized for microwave or room temp per Beletskaya and Ananikov (2011).
What are key papers?
Beletskaya and Ananikov (2011, 1631 citations) foundational review; Modha et al. (2013, 388 citations) on C-S cleavage extensions.
What open problems exist?
Air-stable catalysts without phosphines; beta-selective alkyl thiolations. Scalability beyond 10g challenged by thiol oxidation.
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