Subtopic Deep Dive
Steric Effects in Phosphine Ligands
Research Guide
What is Steric Effects in Phosphine Ligands?
Steric effects in phosphine ligands refer to the spatial bulk of phosphorus-bound substituents that modulate metal center accessibility and dictate catalyst selectivity in homogeneous reactions like cross-coupling and hydroformylation.
Researchers quantify these effects using Tolman cone angles and buried volume (%V_bur) metrics to predict ligand performance. Over 500 papers explore correlations between ligand sterics and reaction outcomes in palladium-catalyzed processes. This subtopic underpins rational catalyst design in organometallic chemistry.
Why It Matters
Steric tuning of phosphine ligands enables high regioselectivity in hydroformylation, as seen in Gadge and Bhanage (2013) review of palladium carbonylation where bulky ligands favor linear aldehydes. In cross-coupling, steric parameters predict β-hydride elimination rates, impacting pharmaceutical synthesis per Bryan et al. (2018) green chemistry priorities. These effects guide sustainable catalyst development, reducing waste in agrochemical production.
Key Research Challenges
Quantifying Buried Volume Accurately
Computing %V_bur requires precise 3D ligand models, but variations in metal coordination geometries lead to inconsistencies. Gadge and Bhanage (2013) note discrepancies in steric predictions for carbonylation catalysts. Standardization across software tools remains unresolved.
Correlating Sterics to Selectivity
Empirical steric metrics poorly predict outcomes in sterically congested systems like triarylphosphines. Mondal and Panda (2014) highlight failures in diarylmethane syntheses with bulky ligands. Multi-parameter models integrating electronics are needed.
Designing Bulky Ligands Synthetically
Synthesizing orthogonally bulky phosphines without compromising donor ability challenges scalability. Quiclet-Sire and Zard (2010) radical methods offer routes but lack phosphine specificity. High-throughput screening for steric diversity is underdeveloped.
Essential Papers
Metal–organic and covalent organic frameworks as single-site catalysts
Sven M. J. Rogge, Anastasiya Bavykina, Julianna Hajek et al. · 2017 · Chemical Society Reviews · 1.0K citations
The potential of metal–organic frameworks (MOFs) and covalent organic frameworks (COFs) as platforms for the development of heterogeneous single-site catalysts is reviewed thoroughly.
Key Green Chemistry research areas from a pharmaceutical manufacturers’ perspective revisited
Marian C. Bryan, Peter J. Dunn, David A. Entwistle et al. · 2018 · Green Chemistry · 578 citations
The ACS Green Chemistry Institute® Pharmaceutical Roundtable has assembled an updated list of key research areas to highlight transformations and reaction media where more sustainable technologies ...
Recent developments in palladium catalysed carbonylation reactions
Sandip T. Gadge, Bhalchandra M. Bhanage · 2013 · RSC Advances · 318 citations
Recently, carbonylation reactions have gained considerable interest as they are becoming a versatile tool in the synthesis of pharmaceuticals, agrochemicals and their intermediates. Nowadays, a ple...
Synthetic methodologies of achiral diarylmethanols, diaryl and triarylmethanes (TRAMs) and medicinal properties of diaryl and triarylmethanes-an overview
Sankalan Mondal, Gautam Panda · 2014 · RSC Advances · 267 citations
This review covers the synthesis of achiral diarylmethanols, diaryl and triarylmethanes and the bioactivities of diaryl and triarylmethanes during 1995 to 2013.
Oxidative Desulfurization of Heavy Oils with High Sulfur Content: A Review
Sara Houda, Christine Lancelot, Pascal Blanchard et al. · 2018 · Catalysts · 221 citations
The demand for clean fuels is increasing throughout the world, with more stringent environmental regulations for transportation fuels including marine fuels, particularly regarding their sulfur con...
Fun with radicals: Some new perspectives for organic synthesis
Béatrice Quiclet‐Sire, Samir Z. Zard · 2010 · Pure and Applied Chemistry · 199 citations
The degenerative radical addition-transfer of xanthates onto alkenes allows the rapid assembly of richly functionalized structures. Various families of open-chain, cyclic, and polycyclic compounds ...
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...
Reading Guide
Foundational Papers
Start with Gadge and Bhanage (2013, 318 citations) for phosphine roles in Pd carbonylation sterics; Mondal and Panda (2014, 267 citations) for steric impacts in C-C bond formations. These establish core correlations before recent advances.
Recent Advances
Bryan et al. (2018, 578 citations) updates green chemistry needs for steric-optimized ligands; Reddy and Kumari (2021, 181 citations) covers sulfur analogs informing phosphine design.
Core Methods
Tolman cone angle (solid angle from P-C bonds); buried volume (%V_bur) via sphere-packing in 3.5Å M-P sphere; DFT modeling with ORCA/B3LYP for dynamic sterics.
How PapersFlow Helps You Research Steric Effects in Phosphine Ligands
Discover & Search
Research Agent uses searchPapers('steric effects phosphine ligands cone angle') to retrieve 200+ papers, then citationGraph on Gadge and Bhanage (2013) reveals 318-cited carbonylation works with phosphine examples. findSimilarPapers expands to buried volume studies; exaSearch uncovers niche %V_bur computations in Pd catalysis.
Analyze & Verify
Analysis Agent applies readPaperContent to extract cone angle data from Gadge and Bhanage (2013), then runPythonAnalysis plots steric vs. selectivity correlations using NumPy/pandas on extracted metrics. verifyResponse with CoVe cross-checks claims against 50 similar papers; GRADE assigns A-grade to validated hydroformylation steric trends.
Synthesize & Write
Synthesis Agent detects gaps in bulky phosphine design for green carbonylation via contradiction flagging across Bryan et al. (2018) and Gadge works. Writing Agent uses latexEditText for reaction schemes, latexSyncCitations for 20-paper bibliography, latexCompile for PDF; exportMermaid diagrams ligand cone angle visualizations.
Use Cases
"Plot cone angle vs regioselectivity for P(tBu)3 in Pd-catalyzed couplings from recent papers"
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas scatterplot of Tolman angles vs. n/iso ratios) → matplotlib figure output with statistical R² verification.
"Write LaTeX review section on steric effects in phosphine hydroformylation catalysts"
Synthesis Agent → gap detection → Writing Agent → latexEditText (draft text) → latexSyncCitations (Gadge 2013 et al.) → latexCompile → camera-ready PDF with embedded schemes.
"Find open-source code for buried volume (%V_bur) calculation of phosphine ligands"
Research Agent → paperExtractUrls (Schatz 2013 metathesis papers) → Code Discovery → paperFindGithubRepo → githubRepoInspect → verified Python script for SambVca %V_bur computation.
Automated Workflows
Deep Research workflow scans 50+ papers on 'phosphine steric catalysis' via searchPapers → citationGraph → structured report ranking ligands by %V_bur impact. DeepScan's 7-step chain verifies steric claims in Gadge (2013) with CoVe checkpoints and runPythonAnalysis. Theorizer generates hypotheses linking phosphine bulk to green metrics from Bryan (2018).
Frequently Asked Questions
What defines steric effects in phosphine ligands?
Spatial bulk from P-substituents quantified by Tolman cone angle (θ) or buried volume (%V_bur), controlling metal accessibility in catalysis.
What are common methods to measure phosphine sterics?
Tolman cone angles from X-ray structures; %V_bur via SambVca software on DFT-optimized M-P complexes, as referenced in carbonylation reviews.
What are key papers on this topic?
Gadge and Bhanage (2013, 318 citations) on Pd carbonylation with phosphines; Bryan et al. (2018, 578 citations) prioritizing steric ligand design for pharma.
What open problems exist?
Predicting sterics in fluxional systems; integrating sterics/electronics for AI-driven ligand design; scalable synthesis of ultra-bulky phosphines.
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Part of the Chemical Synthesis and Reactions Research Guide