Subtopic Deep Dive
C-H Borylation Reactions
Research Guide
What is C-H Borylation Reactions?
C-H borylation reactions are catalytic processes that directly convert C-H bonds to C-B bonds using boron reagents, enabling site-selective functionalization of hydrocarbons and arenes.
These reactions typically employ transition metal catalysts like rhodium or iridium with pinacolborane or bis(pinacolato)diboron. Key advances include high regioselectivity for meta-positions and functional group-directed borylations (Hartwig, 2011; Mkhalid et al., 2009). Over 10 papers from the list exceed 500 citations, with Mkhalid et al. (2009) at 2692 citations.
Why It Matters
C-H borylation provides boronic esters for Suzuki-Miyaura couplings, streamlining synthesis of pharmaceuticals and materials without prefunctionalization (Lennox and Lloyd-Jones, 2013). Hartwig's methods enable late-stage functionalization of complex molecules, impacting drug discovery (Hartwig, 2011, 1039 citations). Directed borylations by Ros et al. (2014) and Kuninobu et al. (2015) expand applications to sp3 C-H bonds and meta-selective arene derivatization.
Key Research Challenges
Regioselectivity Control
Achieving site-selectivity in polyfunctionalized molecules remains difficult due to competing C-H bonds. Hartwig (2011) notes rhodium catalysts favor steric control in arenes, but sp3 selectivity lags. Kuninobu et al. (2015) introduced ligand-substrate interactions for meta-borylation.
Catalyst Efficiency
High catalyst loadings and limited substrate scope hinder scalability. Mkhalid et al. (2009) review early iridium systems requiring directing groups. Functional group tolerance needs improvement for late-stage applications (Ros et al., 2014).
Mechanistic Understanding
Elucidating boron insertion and C-H activation steps is ongoing. Hartwig (2011) describes concerted mechanisms, but computational validation is sparse. Secondary interactions in Kuninobu et al. (2015) require further DFT studies.
Essential Papers
C−H Activation for the Construction of C−B Bonds
Ibraheem A. I. Mkhalid, Jonathan H. Barnard, Todd B. Marder et al. · 2009 · Chemical Reviews · 2.7K citations
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTC−H Activation for the Construction of C−B BondsIbraheem A. I. Mkhalid†‡, Jonathan H. Barnard†, Todd B. Marder*†, Jaclyn M. Murphy§¶, and John F. Hartwig*...
Selection of boron reagents for Suzuki–Miyaura coupling
Alastair J. J. Lennox, Guy C. Lloyd‐Jones · 2013 · Chemical Society Reviews · 1.5K citations
Suzuki-Miyaura (SM) cross-coupling is arguably the most widely-applied transition metal catalysed carbon-carbon bond forming reaction to date. Its success originates from a combination of exception...
Boronic Acids
Dennis G. Hall · 2011 · 1.1K citations
Introduction: Properties, Preparation, Overview of Application Metal-Catalyzed Borylation of C-X and C-H Bonds for the Synthesis of Boronic Esters Transition-Metal Catalyzed Sila- and Diborylation ...
Borylation and Silylation of C–H Bonds: A Platform for Diverse C–H Bond Functionalizations
John F. Hartwig · 2011 · Accounts of Chemical Research · 1.0K citations
Methods that functionalize C-H bonds can lead to new approaches for the synthesis of organic molecules, but to achieve this goal, researchers must develop site-selective reactions that override the...
Regioselectivity of the borylation of alkanes and arenes
John F. Hartwig · 2011 · Chemical Society Reviews · 789 citations
The borylation of alkanes and arenes has become some of the most practical C-H bond functionalization chemistry. Most striking is the high regioselectivity of these reactions. Rhodium and ruthenium...
Recent developments in and perspectives on three-coordinate boron materials: a bright future
Lei Ji, Stefanie Griesbeck, Todd B. Marder · 2016 · Chemical Science · 699 citations
We highlight recent developments in the synthesis, optical and electronic properties of 3-coordinate boron compounds and their applications in materials.
Stereospecific functionalizations and transformations of secondary and tertiary boronic esters
Christopher Sandford, Varinder K. Aggarwal · 2017 · Chemical Communications · 614 citations
This feature article discusses the range of stereospecific transformations available to enantioenriched boronic esters, and their applications in synthesis.
Reading Guide
Foundational Papers
Start with Mkhalid et al. (2009, Chemical Reviews, 2692 citations) for comprehensive mechanisms and early catalysts; follow with Hartwig (2011, Accounts of Chemical Research, 1039 citations) for site-selectivity principles.
Recent Advances
Kuninobu et al. (2015, Nature Chemistry, 527 citations) for meta-C-H borylation; Sandford and Aggarwal (2017) for boronic ester transformations.
Core Methods
Iridium dtbpy-catalyzed borylation with HBpin (Hartwig, 2011); Rh(bpy)2 systems for alkanes (Mkhalid et al., 2009); ligand-directed meta-borylation (Kuninobu et al., 2015).
How PapersFlow Helps You Research C-H Borylation Reactions
Discover & Search
Research Agent uses citationGraph on Mkhalid et al. (2009, 2692 citations) to map 50+ C-H borylation papers from Hartwig and Marder groups, then exaSearch for 'iridium-catalyzed alkane borylation' to uncover underexplored sp3 methods.
Analyze & Verify
Analysis Agent applies readPaperContent to Hartwig (2011) for regioselectivity data, then runPythonAnalysis to plot yield vs. sterics from tables using pandas, with verifyResponse (CoVe) and GRADE scoring confirming 92% meta-selectivity claims.
Synthesize & Write
Synthesis Agent detects gaps in sp3 C-H borylation via contradiction flagging across 20 papers; Writing Agent uses latexEditText for reaction schemes, latexSyncCitations for 15 references, and latexCompile to generate a review section with exportMermaid for catalytic cycles.
Use Cases
"Extract regioselectivity data from Hartwig's borylation papers and plot vs. substrate sterics"
Research Agent → searchPapers('Hartwig borylation regioselectivity') → Analysis Agent → readPaperContent (Hartwig 2011) → runPythonAnalysis (pandas plot of A-values vs. yield) → matplotlib figure of steric trends.
"Draft a LaTeX section on directed C-H borylation with meta-selective examples"
Synthesis Agent → gap detection (Ros 2014 + Kuninobu 2015) → Writing Agent → latexGenerateFigure (borylation schemes) → latexSyncCitations (10 papers) → latexCompile → PDF with embedded reaction diagrams.
"Find open-source codes for DFT modeling of C-H borylation mechanisms"
Research Agent → searchPapers('C-H borylation DFT') → Code Discovery → paperExtractUrls → paperFindGithubRepo (Kuninobu 2015 supplements) → githubRepoInspect → verified Gaussian input files for meta-borylation TS.
Automated Workflows
Deep Research workflow scans 50+ papers via citationGraph from Mkhalid et al. (2009), structures a report on catalyst evolution: iridium → rhodium → ruthenium. DeepScan applies 7-step CoVe to verify regioselectivity claims in Hartwig (2011), flagging 3 contradictions. Theorizer generates hypotheses on ligand effects from Kuninobu et al. (2015) + Hartwig reviews.
Frequently Asked Questions
What defines C-H borylation reactions?
Catalytic conversion of C-H to C-B bonds using HBpin or B2pin2 with Ir/Rh catalysts, avoiding prefunctionalization (Mkhalid et al., 2009).
What are main methods in C-H borylation?
Iridium-catalyzed arene/alkane borylation (Hartwig, 2011), directing group strategies (Ros et al., 2014), and meta-selective ligand-directed methods (Kuninobu et al., 2015).
What are key papers on C-H borylation?
Mkhalid et al. (2009, 2692 citations) reviews fundamentals; Hartwig (2011, 1039 citations) covers silylation parallels; Kuninobu et al. (2015, 527 citations) introduces meta-selectivity.
What are open problems in C-H borylation?
Scalable sp3 borylation without directing groups, earth-abundant catalysts beyond Ir/Rh, and predictive models for regioselectivity (Hartwig, 2011; Ros et al., 2014).
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