Related Experiment Video
Updated: Oct 12, 2025
08:56
Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
Published on: November 30, 2022
3.0K
Modular Organoboron Catalysts Enable Transformations with Unprecedented Reactivity
Guan-Wen Yang1, Yao-Yao Zhang1, Guang-Peng Wu1
1MOE Laboratory of Macromolecular Synthesis and Functionalization, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Accounts of Chemical Research
|November 22, 2021
Summary
Researchers developed modular organoboron catalysts with dynamic Lewis multicore systems for efficient chemical transformations. These metal-free catalysts exhibit high activity and are easily prepared, overcoming limitations of traditional catalysts.
Area of Science:
- Organometallic Chemistry
- Catalysis
- Polymer Science
Background:
- Electron-deficient boron-based catalysts offer metal-free alternatives but often show lower performance than metal catalysts.
- Synthesizing complex organoboron compounds is typically multistep and low-yield, hindering large-scale applications.
- There is a critical need for organoboron catalysts that are both highly efficient and easy to prepare.
Purpose of the Study:
- To develop modular organoboron catalysts with enhanced activity and simplified preparation.
- To explore the synergistic effects within a dynamic Lewis multicore system (DLMCS) for catalytic applications.
- To investigate the catalysts' performance in various chemical transformations, including CO2 utilization and polymerization reactions.
Main Methods:
- Design and synthesis of mono-, di-, tri-, and tetranuclear organoboron catalysts via a two-step modular approach.
- Tailoring catalyst properties by controlling boron electrophilicity, ammonium cation effects, linker length, and anion.
- Evaluation of catalytic performance using techniques such as reaction kinetics, crystal structure analysis, and density functional theory (DFT) calculations.
Main Results:
- Organoboron catalysts achieved unprecedented efficiencies in CO2 coupling and copolymerization with epoxides (e.g., 11050 h-1 turnover frequency, 7.4 kg polymer/g catalyst).
- High turnover numbers (56500) and polymer molecular weights (36.5 kg/mol) were observed in epoxide ring-opening polymerization and copolymerization.
- The intramolecular synergistic effect between boron centers and ammonium salts was identified as crucial for catalytic activity and selectivity.
Conclusions:
- The developed modular organoboron catalysts demonstrate high efficiency and ease of preparation, addressing key limitations in the field.
- The dynamic Lewis multicore system enables fine-tuning of catalyst properties for diverse chemical transformations.
- This modular strategy provides a foundation for designing advanced organoboron catalysts for future applications.
Related Concept Videos
02:36Regioselectivity and Stereochemistry of Hydroboration
8.5K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.5K
03:08Hydroboration-Oxidation of Alkenes
9.3K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
9.3K
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
19.2K
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
19.2K
01:23Properties of Organometallic Compounds
1.2K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
1.2K
01:11ortho–para-Directing Activators: –CH3, –OH, –NH2, –OCH3
6.6K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
6.6K
01:25Radical Anti-Markovnikov Addition to Alkenes: Overview
3.7K
The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
3.7K