Subtopic Deep Dive
Catalytic C-H Sulfonylation
Research Guide
What is Catalytic C-H Sulfonylation?
Catalytic C-H sulfonylation enables direct installation of sulfone groups onto C-H bonds using metal catalysts without prefunctionalization of substrates.
This technique employs palladium, gold, nickel, and photoredox catalysts for selective C-H activation and sulfonyl group transfer. Key methods include three-component couplings with DABSO as SO2 surrogate (Emmett et al., 2013, 245 citations) and dual photoredox/nickel catalysis (Yue et al., 2017, 212 citations). Over 10 papers from 2013-2022 detail advances in sulfone synthesis.
Why It Matters
Catalytic C-H sulfonylation reduces synthetic steps in pharmaceutical and agrochemical synthesis by avoiding prefunctionalized arenes or alkanes. Emmett et al. (2013) demonstrated Pd-catalyzed diaryl sulfone formation from aryl lithium and DABSO, enabling diverse sulfone libraries. Yue et al. (2017) expanded this to aryl halides via Ni/photoredox catalysis, impacting complex molecule assembly. Johnson et al. (2014) introduced Au-catalyzed sulfinate synthesis from boronic acids, streamlining organosulfur compound production.
Key Research Challenges
Regioselectivity in C-H activation
Achieving site-specific sulfonylation on polyfunctional molecules remains difficult without directing groups. Yue et al. (2017) addressed this in aryl halides but polycyclic systems show poor selectivity. Computational models for predicting regiochemistry are underdeveloped.
Catalyst deactivation by sulfones
Sulfone byproducts poison Pd and Ni catalysts, limiting turnover numbers. Emmett et al. (2013) used DABSO to mitigate SO2 toxicity but long-chain substrates still deactivate. Ligand design for stability is a priority.
Scalability of photoredox systems
Dual photoredox/metal catalysis (Zhu et al., 2020) excels in lab scale but light penetration and reactor design hinder gram-scale runs. Energy efficiency and byproduct removal need optimization.
Essential Papers
Organic thermally activated delayed fluorescence (TADF) compounds used in photocatalysis
Megan Bryden, Eli Zysman‐Colman · 2021 · Chemical Society Reviews · 433 citations
Organic compounds that show Thermally Activated Delayed Fluorescence (TADF) have become wildly popular as next generation emitters in organic light-emitting diodes (OLEDs), but since 2016, have rec...
Recent advances in photoredox and nickel dual-catalyzed cascade reactions: pushing the boundaries of complexity
Chen Zhu, Huifeng Yue, Lingling Chu et al. · 2020 · Chemical Science · 342 citations
Cascade reactions that produce multiple chemical bonds in one synthetic operation are important in the efficient construction of complex molecules.
Application of Fundamental Organometallic Chemistry to the Development of a Gold‐Catalyzed Synthesis of Sulfinate Derivatives
Miles W. Johnson, Scott W. Bagley, Neal P. Mankad et al. · 2014 · Angewandte Chemie International Edition · 249 citations
Abstract The development of a gold(I)‐catalyzed sulfination of aryl boronic acids is described. This transformation proceeds through an unprecedented mechanism which exploits the reactivity of gold...
Palladium‐Catalyzed Three‐Component Diaryl Sulfone Synthesis Exploiting the Sulfur Dioxide Surrogate DABSO
Edward J. Emmett, Barry R. Hayter, Michael C. Willis · 2013 · Angewandte Chemie International Edition · 245 citations
SO(2) efficient: A three-component palladium-catalyzed coupling of aryl lithium compounds; sulfur dioxide (provided by the easy-to-handle solid surrogate, DABSO); and aryl, heteroaryl, and alkenyl ...
One-pot palladium-catalyzed synthesis of sulfonyl fluorides from aryl bromides
Alyn T. Davies, John M. Curto, Scott W. Bagley et al. · 2016 · Chemical Science · 221 citations
A mild, efficient synthesis of sulfonyl fluorides from aryl and heteroaryl bromides utilizing palladium catalysis is described.
Organothianthrenium salts: synthesis and utilization
Huan Meng, Ming‐Shang Liu, Wei Shu · 2022 · Chemical Science · 213 citations
This review summarizes the synthesis of diverse organothianthrenium salts from various precursors and their applications in organic synthesis to forge new C–C, C–H and C–heteroatom bonds by C–S bon...
Cross‐Coupling of Sodium Sulfinates with Aryl, Heteroaryl, and Vinyl Halides by Nickel/Photoredox Dual Catalysis
Huifeng Yue, Chen Zhu, Magnus Rueping · 2017 · Angewandte Chemie International Edition · 212 citations
Abstract An efficient photoredox/nickel catalyzed sulfonylation reaction of aryl, heteroaryl, and vinyl halides has been achieved for the first time. This newly developed sulfonylation protocol pro...
Reading Guide
Foundational Papers
Start with Emmett et al. (2013, Pd/DABSO, 245 citations) for three-component sulfone synthesis and Johnson et al. (2014, Au/sulfinate, 249 citations) for heteroatom bond mechanisms.
Recent Advances
Study Yue et al. (2017, Ni/photoredox, 212 citations) for halide sulfonylation and Zhu et al. (2020, 342 citations) for cascade complexity.
Core Methods
Core techniques: DABSO-mediated Pd coupling, dual photoredox/Ni catalysis, gold(I)-heteroatom activation, and thianthrenium salt reagents (Meng et al., 2022).
How PapersFlow Helps You Research Catalytic C-H Sulfonylation
Discover & Search
Research Agent uses searchPapers('Catalytic C-H sulfonylation Pd DABSO') to retrieve Emmett et al. (2013, 245 citations), then citationGraph to map 50+ citing works and findSimilarPapers for Ni/photoredox variants like Yue et al. (2017). exaSearch uncovers obscure directing group strategies across 250M+ OpenAlex papers.
Analyze & Verify
Analysis Agent applies readPaperContent on Emmett et al. (2013) to extract yields and scopes, then verifyResponse with CoVe chain-of-verification cross-checks claims against 10 similar papers. runPythonAnalysis parses reaction data into pandas for yield statistics; GRADE scores evidence strength for Pd vs Au catalysts (Johnson et al., 2014).
Synthesize & Write
Synthesis Agent detects gaps like scalable photoredox methods via contradiction flagging across Zhu et al. (2020) and Yue et al. (2017). Writing Agent uses latexEditText for mechanism revisions, latexSyncCitations to integrate 20 references, latexCompile for publication-ready schemes, and exportMermaid for catalytic cycle diagrams.
Use Cases
"Extract and plot yield distributions from Pd-catalyzed sulfonylation papers using Python."
Research Agent → searchPapers → Analysis Agent → readPaperContent (10 papers) → runPythonAnalysis (pandas/matplotlib yield histogram) → researcher gets CSV export with statistical summary.
"Draft a review section on DABSO-mediated C-H sulfonylation with figures."
Synthesis Agent → gap detection → Writing Agent → latexEditText (draft) → latexSyncCitations (Emmett 2013 et al.) → latexCompile + latexGenerateFigure → researcher gets PDF with reaction schemes.
"Find open-source codes for modeling Ni/photoredox sulfonylation mechanisms."
Research Agent → searchPapers → Code Discovery (paperExtractUrls → paperFindGithubRepo → githubRepoInspect on Zhu et al. 2020 citations) → researcher gets verified DFT scripts and repo diffs.
Automated Workflows
Deep Research workflow scans 50+ papers on 'C-H sulfonylation catalyst comparison' via searchPapers → citationGraph → structured report with GRADE-scored tables. DeepScan's 7-step analysis verifies regioselectivity claims (readPaperContent → CoVe → runPythonAnalysis). Theorizer generates hypotheses on bifunctional ligands from Emmett (2013) and Johnson (2014) mechanisms.
Frequently Asked Questions
What is catalytic C-H sulfonylation?
It functionalizes inert C-H bonds with sulfone groups using transition metal catalysts like Pd or Ni, bypassing preactivation (Emmett et al., 2013).
What are main methods?
Pd/DABSO three-component coupling (Emmett et al., 2013), Ni/photoredox cross-coupling (Yue et al., 2017), and Au-catalyzed sulfinate formation (Johnson et al., 2014).
What are key papers?
Foundational: Emmett et al. (2013, 245 citations), Johnson et al. (2014, 249 citations). Recent: Yue et al. (2017, 212 citations), Zhu et al. (2020, 342 citations).
What open problems exist?
Regioselective activation in complex molecules, catalyst stability with sulfones, and scalable photoredox processes (Zhu et al., 2020).
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Part of the Sulfur-Based Synthesis Techniques Research Guide