Subtopic Deep Dive
Photoredox-Catalyzed Sulfur Bond Formation
Research Guide
What is Photoredox-Catalyzed Sulfur Bond Formation?
Photoredox-catalyzed sulfur bond formation uses visible-light-activated catalysts to enable mild construction of C-S bonds in organic synthesis.
This approach employs organic dyes like eosin Y or semiconductors for single-electron transfer processes that generate sulfur-centered radicals. It integrates dual catalysis with nickel or manganese for selective couplings of sulfinates, thiols, and alkyl halides. Over 10 key papers since 2014 document methods with >100 citations each, including Hari and König (2014) at 1025 citations.
Why It Matters
Photoredox methods replace high-temperature stoichiomeric sulfurations with room-temperature processes, enabling synthesis of thioethers and sulfones for pharmaceuticals like antibiotics. Reddy and Kumari (2021) highlight sodium sulfinates enabling thiosulfonates and sulfonamides in 181-cited review. Yan et al. (2021) demonstrate divergent aldehyde functionalizations with sulfones (87 citations), impacting agrochemicals and materials. Savateev et al. (2018) introduce carbon nitride for direct C-H thiolation (126 citations), advancing sustainable S-incorporation.
Key Research Challenges
Radical Selectivity Control
Achieving regioselective C-S bond formation amid competing radical pathways remains difficult. Yan et al. (2021) address umpolung acyl radicals from aldehydes with sulfones, yet side reactions persist (87 citations). Dual catalysis helps but requires optimization for complex substrates.
Catalyst Stability Issues
Organic dyes like eosin Y degrade under prolonged irradiation, limiting scalability. Hari and König (2014) review eosin Y applications but note photobleaching (1025 citations). Semiconductor alternatives like quantum dots in Wu et al. (2023) improve durability (81 citations).
Sulfur Source Efficiency
Efficient use of cheap sulfur sources like elemental sulfur challenges overstoichiometry. Savateev et al. (2018) use carbon nitride radical anions for C-H thiolation with elemental sulfur (126 citations). Reddy and Kumari (2021) emphasize sodium sulfinates but seek greener variants (181 citations).
Essential Papers
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.
Synthesis and applications of sodium sulfinates (RSO<sub>2</sub>Na): a powerful building block for the synthesis of organosulfur compounds
Raju Jannapu Reddy, Arram Haritha Kumari · 2021 · RSC Advances · 181 citations
This review provides a unique and comprehensive overview of sodium sulfinates for synthesizing many valuable sulfur-containing compounds, such as thiosulfonates, sulfonamides, sulfides, sulfones, a...
A “waiting” carbon nitride radical anion: a charge storage material and key intermediate in direct C–H thiolation of methylarenes using elemental sulfur as the “S”-source
Aleksandr Savateev, Bogdan Kurpil, Artem M. Mishchenko et al. · 2018 · Chemical Science · 126 citations
Potassium poly(heptazine imide), a carbon nitride semiconductor, in the presence of hole scavengers and visible light gives stable radical anion with the specific density of unpaired electrons reac...
Selective deoxygenative alkylation of alcohols via photocatalytic domino radical fragmentations
Hongmei Guo, Xuesong Wu · 2021 · Nature Communications · 113 citations
Manganese-mediated reductive functionalization of activated aliphatic acids and primary amines
Zhan Li, Kefeng Wang, Xin Zhao et al. · 2020 · Nature Communications · 93 citations
Divergent functionalization of aldehydes photocatalyzed by neutral eosin Y with sulfone reagents
Jianming Yan, Haidi Tang, Eugene Jun Rong Kuek et al. · 2021 · Nature Communications · 87 citations
Abstract While aldehydes represent a classic class of electrophilic synthons, the corresponding acyl radicals are inherently nucleophilic, which exhibits umpolung reactivity. Generation of acyl rad...
Reading Guide
Foundational Papers
Start with Hari and König (2014, 1025 citations) for eosin Y basics in photoredox, as it establishes dye catalysis for S-bonds cited in all later works.
Recent Advances
Study Yan et al. (2021, 87 citations) for sulfone innovations and Wu et al. (2023, 81 citations) for quantum dot advances building on dye limitations.
Core Methods
Core techniques: SET with eosin Y or carbon nitrides for radical generation; dual Ni-photoredox (Zhu 2022); sulfinates as S1 synthons (Reddy 2021).
How PapersFlow Helps You Research Photoredox-Catalyzed Sulfur Bond Formation
Discover & Search
Research Agent uses searchPapers('photoredox sulfur bond formation eosin Y') to retrieve Hari and König (2014, 1025 citations), then citationGraph to map 50+ citing works on dye-catalyzed C-S couplings, and findSimilarPapers to uncover Yan et al. (2021) for sulfone variants.
Analyze & Verify
Analysis Agent applies readPaperContent on Savateev et al. (2018) to extract carbon nitride mechanisms, verifyResponse with CoVe against Reddy and Kumari (2021) for sulfinates, and runPythonAnalysis to plot radical yields from supplementary data using pandas, with GRADE scoring mechanistic claims A-grade.
Synthesize & Write
Synthesis Agent detects gaps in scalable C-S methods post-Hari and König (2014), flags contradictions in radical pathways between Yan et al. (2021) and Wu et al. (2023); Writing Agent uses latexEditText for reaction schemes, latexSyncCitations for 20-paper bibliography, and latexCompile for camera-ready reviews with exportMermaid for catalytic cycles.
Use Cases
"Extract and plot yield data from photoredox C-S papers using Python."
Research Agent → searchPapers('photoredox sulfur') → Analysis Agent → readPaperContent (Yan et al. 2021) → runPythonAnalysis (pandas plot of yields vs. wavelength) → matplotlib figure of 87-cited data trends.
"Draft LaTeX review of eosin Y in sulfur couplings."
Synthesis Agent → gap detection (post-Hari 2014) → Writing Agent → latexEditText (intro + schemes) → latexSyncCitations (10 papers) → latexCompile → PDF with embedded mechanisms.
"Find GitHub code for quantum dot photoredox simulations."
Research Agent → searchPapers('quantum dots photoredox sulfur') → Code Discovery: paperExtractUrls (Wu et al. 2023) → paperFindGithubRepo → githubRepoInspect → DFT simulation scripts for S-radical modeling.
Automated Workflows
Deep Research workflow scans 50+ papers via searchPapers on 'photoredox C-S bonds', structures report with citationGraph clusters around eosin Y and nickel dual catalysis from Zhu et al. (2022). DeepScan applies 7-step CoVe to verify Savateev et al. (2018) thiolation claims against experimental data. Theorizer generates hypotheses for merging electrochemistry (Kärkäs 2018) with photoredox for asymmetric S-formations.
Frequently Asked Questions
What defines photoredox-catalyzed sulfur bond formation?
It involves visible-light photoredox catalysts generating sulfur radicals for C-S couplings under mild conditions, as in Hari and König (2014) using eosin Y.
What are common methods?
Methods include eosin Y single-electron transfer (Hari 2014), carbon nitride C-H thiolation (Savateev 2018), and sulfone umpolung (Yan 2021); dual nickel-photoredox enables stereodivergence (Zhu 2022).
What are key papers?
Foundational: Hari and König (2014, 1025 citations) on eosin Y. Recent: Reddy and Kumari (2021, 181 citations) on sulfinates; Yan et al. (2021, 87 citations) on aldehyde sulfones.
What open problems exist?
Challenges include catalyst photostability beyond dyes (Wu 2023), selective functionalization of unactivated C-H (Savateev 2018), and enantioselective variants lacking in current literature.
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Part of the Sulfur-Based Synthesis Techniques Research Guide