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Cyclopropane Reaction Mechanisms
Research Guide
What is Cyclopropane Reaction Mechanisms?
Cyclopropane reaction mechanisms refer to the chemical processes involving catalytic carbene chemistry in organic synthesis, particularly the reactions of donor-acceptor cyclopropanes, diazo compounds, and metal-catalyzed transformations such as enantioselective synthesis and site-selective functionalization.
This field encompasses 52,450 papers on carbene chemistry, cyclopropanation, and metal-catalyzed reactions with donor-acceptor cyclopropanes. Key areas include enantioselective synthesis, rhodium-catalyzed reactions, diazo compounds, and artificial metalloenzymes for carbene transfer. Growth data over the past five years is not available.
Topic Hierarchy
Research Sub-Topics
Donor-Acceptor Cyclopropanes
This sub-topic explores the reactivity of donor-acceptor cyclopropanes in ring-opening reactions and cycloadditions for complex molecule synthesis. Researchers investigate activation modes and stereocontrol mechanisms.
Metal-Catalyzed Cyclopropanation
This sub-topic covers rhodium, copper, and other metal catalysts for diazo compound-based cyclopropanation of alkenes. Researchers focus on enantioselectivity, scope, and mechanistic insights.
Carbene Transfer Reactions
This sub-topic examines catalytic transfer of carbenes for C-H insertion, cyclopropanation, and ylide formation. Researchers study ligand effects and substrate compatibility.
Enantioselective Cyclopropanation
This sub-topic develops chiral catalysts for asymmetric cyclopropanation yielding enantioenriched cyclopropanes. Researchers optimize selectivity and apply to total synthesis.
Artificial Metalloenzymes for Carbene Transfer
This sub-topic engineers protein-metal hybrids for selective carbene transfer mimicking natural enzymes. Researchers combine directed evolution with organometallic catalysis.
Why It Matters
Cyclopropane reaction mechanisms enable efficient organic synthesis through metal-catalyzed processes that functionalize C-H bonds and form C-C bonds, applicable in natural product and drug synthesis. For example, Colby et al. (2009) in "Rhodium-Catalyzed C−C Bond Formation via Heteroatom-Directed C−H Bond Activation" describe rhodium-catalyzed methods that leverage the ubiquity and low cost of hydrocarbons for C-H functionalization, achieving synthetically useful reactions with 3652 citations. Ackermann (2011) in "Carboxylate-Assisted Transition-Metal-Catalyzed C−H Bond Functionalizations: Mechanism and Scope" outlines carboxylate-assisted mechanisms that expand the scope of C-H activations, cited 3314 times, supporting atom-economical catalysis as emphasized by Trost (1995) in "Atom Economy—A Challenge for Organic Synthesis: Homogeneous Catalysis Leads the Way" with 2566 citations.
Reading Guide
Where to Start
"A stable crystalline carbene" by Arduengo et al. (1991), as it provides the foundational demonstration of isolable carbenes essential for understanding catalytic carbene chemistry in cyclopropane reactions.
Key Papers Explained
Arduengo et al. (1991) "A stable crystalline carbene" establishes stable carbenes (4089 citations), which Hopkinson et al. (2014) "An overview of N-heterocyclic carbenes" expands to catalytic applications (4083 citations). Colby et al. (2009) "Rhodium-Catalyzed C−C Bond Formation via Heteroatom-Directed C−H Bond Activation" applies rhodium catalysis to C-H activation for C-C bonds (3652 citations), building on carbene stability. Bourissou et al. (1999) "Stable Carbenes" connects to mechanistic insights (3544 citations), while Ackermann (2011) "Carboxylate-Assisted Transition-Metal-Catalyzed C−H Bond Functionalizations: Mechanism and Scope" details assisting groups for broader scope (3314 citations).
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current frontiers involve enantioselective synthesis and site-selective functionalization of donor-acceptor cyclopropanes using rhodium and transition-metal catalysts, as per the topic description. Artificial metalloenzymes for carbene transfer represent an emerging area. No recent preprints from the last six months or news from the last 12 months are available.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | A stable crystalline carbene | 1991 | Journal of the America... | 4.1K | ✕ |
| 2 | An overview of N-heterocyclic carbenes | 2014 | Nature | 4.1K | ✕ |
| 3 | Rhodium-Catalyzed C−C Bond Formation via Heteroatom-Directed C... | 2009 | Chemical Reviews | 3.7K | ✓ |
| 4 | Aryl−Aryl Bond Formation One Century after the Discovery of th... | 2002 | Chemical Reviews | 3.6K | ✕ |
| 5 | Aryl−Aryl Bond Formation by Transition-Metal-Catalyzed Direct ... | 2007 | Chemical Reviews | 3.6K | ✕ |
| 6 | Stable Carbenes | 1999 | Chemical Reviews | 3.5K | ✕ |
| 7 | Carboxylate-Assisted Transition-Metal-Catalyzed C−H Bond Funct... | 2011 | Chemical Reviews | 3.3K | ✕ |
| 8 | Proline-Catalyzed Direct Asymmetric Aldol Reactions | 2000 | Journal of the America... | 2.8K | ✕ |
| 9 | Atom Economy—A Challenge for Organic Synthesis: Homogeneous Ca... | 1995 | Angewandte Chemie Inte... | 2.6K | ✕ |
| 10 | Catalytic Carbophilic Activation: Catalysis by Platinum and Go... | 2007 | Angewandte Chemie Inte... | 2.3K | ✕ |
Frequently Asked Questions
What are donor-acceptor cyclopropanes in this context?
Donor-acceptor cyclopropanes are substrates used in catalytic carbene chemistry for organic synthesis, featuring electron-donating and electron-withdrawing groups that facilitate ring-opening and functionalization. They enable metal-catalyzed reactions like enantioselective synthesis and site-selective transformations. This cluster highlights their role alongside diazo compounds in rhodium-catalyzed processes.
How do metal catalysts function in cyclopropane reactions?
Metal catalysts, such as rhodium and transition metals, activate C-H bonds or carbenes for C-C bond formation in cyclopropanation and functionalization. Colby et al. (2009) detail rhodium-catalyzed heteroatom-directed C-H activation for synthesis. Ackermann (2011) explains carboxylate-assisted mechanisms that enhance scope and selectivity.
What is the role of carbenes in these mechanisms?
Carbenes, generated from diazo compounds, participate in metal-catalyzed cyclopropanation and transfer reactions. Arduengo et al. (1991) introduced a stable crystalline carbene, foundational with 4089 citations. Bourissou et al. (1999) review stable carbenes' applications in "Stable Carbenes", cited 3544 times.
What applications arise from enantioselective synthesis here?
Enantioselective synthesis via cyclopropane mechanisms produces chiral molecules for pharmaceuticals using metal catalysts. Hopkinson et al. (2014) overview N-heterocyclic carbenes' role in asymmetric catalysis, with 4083 citations. These methods support site-selective functionalization in organic synthesis.
What is the current state of this field?
The field includes 52,450 works focused on carbene chemistry and donor-acceptor cyclopropanes, with no growth rate data over five years. Top papers emphasize stable carbenes and C-H activations by rhodium. No recent preprints or news coverage from the last 12 months is available.
Open Research Questions
- ? How can artificial metalloenzymes improve selectivity in carbene transfer from donor-acceptor cyclopropanes?
- ? What mechanisms govern site-selective functionalization in rhodium-catalyzed diazo compound reactions?
- ? Which transition-metal combinations optimize enantioselective cyclopropanation yields?
- ? How do N-heterocyclic carbenes interact with donor-acceptor cyclopropanes in C-C bond formations?
- ? What limits the scope of carboxylate-assisted C-H functionalizations in complex cyclopropane syntheses?
Recent Trends
The field maintains 52,450 papers with no specified five-year growth rate.
Highly cited works like Arduengo et al. "A stable crystalline carbene" (4089 citations) and Hopkinson et al. (2014) "An overview of N-heterocyclic carbenes" (4083 citations) underscore ongoing reliance on stable carbene foundations.
1991No recent preprints or news coverage indicates steady focus on established metal-catalyzed mechanisms.
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