Subtopic Deep Dive
Ligand Effects in Homogeneous Gold Catalysis
Research Guide
What is Ligand Effects in Homogeneous Gold Catalysis?
Ligand effects in homogeneous gold catalysis describe how phosphine, NHC, and other ligands influence gold(I) catalyst activation, selectivity, and stability in alkyne transformations.
Researchers study structure-activity relationships through experimental and computational methods. Key reviews include Wang et al. (2012, 341 citations) on ligand design stages and Ranieri et al. (2015, 213 citations) on precatalyst activation and anion effects. Over 10 papers from 2011-2019 document these effects with 3000+ total citations.
Why It Matters
Ligand optimization enables milder reaction conditions and expanded substrate scope in alkyne cycloadditions and activations, impacting synthesis of pharmaceuticals and materials. Wang et al. (2012) established ligand roles in proto-demetalation and reductive elimination, guiding design for higher turnover numbers. Echavarren groups' works (Dorel and Echavarren, 2015; Obradors and Echavarren, 2013; Ranieri et al., 2015) link ligand choice to mechanistic control in complex molecule assembly, reducing waste in industrial processes.
Key Research Challenges
Ligand Sterics vs. Electronics
Balancing steric bulk and electronic properties controls regioselectivity but leads to catalyst decomposition. Wang et al. (2012) identify three reaction stages where mismatches cause side reactions. Obradors and Echavarren (2013) map labyrinthine pathways sensitive to ligand tuning.
Mechanistic Pathway Diversity
Multiple proto-demetalation and carbenoid paths complicate prediction. Ranieri et al. (2015) debunk myths on silver activation and anion effects. Echavarren reviews (2013, 2015) highlight non-classical intermediates varying by ligand.
Stability Under Oxidative Conditions
Au(I)/Au(III) cycling demands ligands resisting oxidation. Zeineddine et al. (2017) enable mild aryl halide addition via rational ligand design. Zhang (2014) notes alkyne oxidation challenges without diazo precursors.
Essential Papers
Gold(I)-Catalyzed Activation of Alkynes for the Construction of Molecular Complexity
Ruth Dorel, Antonio M. Echavarren · 2015 · Chemical Reviews · 1.7K citations
For centuries, gold had been considered a precious, purely decorative inert metal. It was not until 1986 that Ito and Hayashi described the first application of gold(I) in homogeneous catalysis.(1)...
A Non-Diazo Approach to α-Oxo Gold Carbenes via Gold-Catalyzed Alkyne Oxidation
Liming Zhang · 2014 · Accounts of Chemical Research · 668 citations
For the past dozen years, homogeneous gold catalysis has evolved from a little known topic in organic synthesis to a fully blown research field of significant importance to synthetic practitioners,...
Ligand Effects and Ligand Design in Homogeneous Gold(I) Catalysis
Weibo Wang, Gerald B. Hammond, Bo Xu · 2012 · Journal of the American Chemical Society · 341 citations
Gold catalysis is considered one of the most important breakthroughs in organic synthesis during the past decade, but a rational understanding of ligand effects in gold catalysis is lacking. Most g...
Intriguing mechanistic labyrinths in gold(<scp>i</scp>) catalysis
Carla Obradors, Antonio M. Echavarren · 2013 · Chemical Communications · 321 citations
Many mechanistically intriguing reactions have been developed in the last decade using gold(I) as catalyst. Here we review the main mechanistic proposals in gold-catalysed activation of alkynes and...
Rational development of catalytic Au(I)/Au(III) arylation involving mild oxidative addition of aryl halides
Abdallah Zeineddine, Laura Estévez, Sonia Mallet‐Ladeira et al. · 2017 · Nature Communications · 308 citations
Atom-economic generation of gold carbenes: gold-catalyzed formal [3+2] cycloaddition between ynamides and isoxazoles
Aihua Zhou, Qiao He, Chao Shu et al. · 2014 · Chemical Science · 268 citations
An unprecedented gold-catalyzed formal [3+2] cycloaddition between ynamides and isoxazoles has been developed, allowing rapid and practical access to a wide range of synthetically useful 2-aminopyr...
Anatomy of gold catalysts: facts and myths
Beatrice Ranieri, Imma Escofet, Antonio M. Echavarren · 2015 · Organic & Biomolecular Chemistry · 213 citations
This review article covers the main types of gold(<sc>i</sc>) complexes used as precatalysts under homogeneous conditions in organic synthesis and discusses the different ways of catalyst activatio...
Reading Guide
Foundational Papers
Start with Wang et al. (2012) for ligand stages framework (341 citations), then Obradors and Echavarren (2013) for alkyne mechanisms (321 citations), and Ranieri et al. (2015) for activation facts (213 citations).
Recent Advances
Study Zeineddine et al. (2017) on Au(I)/Au(III) arylation (308 citations) and Dorel and Echavarren (2015) review (1668 citations) for complexity building.
Core Methods
Slip mechanism, proto-demetalation tuning, DFT for electronics/sterics (Wang 2012), silver-free activation (Ranieri 2015), oxidative alkyne paths (Zhang 2014).
How PapersFlow Helps You Research Ligand Effects in Homogeneous Gold Catalysis
Discover & Search
Research Agent uses searchPapers for 'ligand effects gold catalysis alkyne' retrieving Wang et al. (2012, 341 citations), then citationGraph maps 1668-citation review by Dorel and Echavarren (2015), and findSimilarPapers uncovers Ranieri et al. (2015) on activation myths.
Analyze & Verify
Analysis Agent applies readPaperContent to Wang et al. (2012) for ligand stages, verifyResponse with CoVe cross-checks claims against Obradors and Echavarren (2013), and runPythonAnalysis plots structure-activity data from Zhang (2014) using pandas for correlation stats with GRADE scoring evidence strength.
Synthesize & Write
Synthesis Agent detects gaps in ligand design for oxidative additions post-Zeineddine et al. (2017), while Writing Agent uses latexEditText on schemes, latexSyncCitations for 10+ refs, and latexCompile for publication-ready reviews with exportMermaid for mechanistic flowcharts.
Use Cases
"Analyze ligand effects on gold carbenoid selectivity in alkyne cycloadditions"
Research Agent → searchPapers + citationGraph (Wang 2012 hub) → Analysis Agent → runPythonAnalysis (pandas regression on SAR data) → CSV export of selectivity metrics.
"Draft LaTeX review on phosphine vs NHC ligands in gold catalysis"
Synthesis Agent → gap detection (post-2017 Au(I)/Au(III)) → Writing Agent → latexEditText + latexSyncCitations (Echavarren papers) + latexCompile → PDF with diagrams.
"Find open-source code for gold catalyst modeling from literature"
Research Agent → exaSearch 'gold catalysis DFT ligands' → Code Discovery → paperExtractUrls → paperFindGithubRepo → githubRepoInspect → Python DFT scripts for ligand screening.
Automated Workflows
Deep Research workflow scans 50+ gold catalysis papers via searchPapers, structures ligand effect timelines with citationGraph, and outputs GRADE-verified reports. DeepScan's 7-step chain analyzes Wang et al. (2012) with readPaperContent → CoVe → runPythonAnalysis on energetics. Theorizer generates ligand design hypotheses from Echavarren mechanistic data (2013, 2015).
Frequently Asked Questions
What defines ligand effects in gold catalysis?
Ligand effects modulate Au(I) activation of alkynes by tuning sterics, electronics, and stability in stages like slip, proto-demetalation per Wang et al. (2012). Phosphines and NHCs alter selectivity in cycloadditions (López and Mascareñas, 2011).
What methods study these effects?
Experimental SAR, DFT modeling, and anion/silver effect tests. Ranieri et al. (2015) detail precatalyst activation; Zeineddine et al. (2017) use oxidative additions.
What are key papers?
Foundational: Wang et al. (2012, 341 cites), Obradors and Echavarren (2013, 321 cites). Recent: Ranieri et al. (2015, 213 cites), Zeineddine et al. (2017, 308 cites).
What open problems exist?
Predicting ligand roles in Au(I)/Au(III) cycles and non-diazo carbenes. Gaps in oxidative stability (Zhang, 2014) and pathway selectivity (Echavarren, 2013).
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Part of the Catalytic Alkyne Reactions Research Guide