Copper-catalyzed yne-allylic substitutions: concept and recent developments

• Shuang Yang and
• Xinqiang Fang

Beilstein J. Org. Chem. 2024, 20, 2739–2775, doi:10.3762/bjoc.20.232

• -value oxazolidinones with exceptional yields and enantioselectivities. This not only addresses the challenge of CO2 waste but also opens new avenues for the sustainable synthesis of complex molecules. Comprehensive mechanistic investigations underscored the pivotal role of DABCO in promoting CO2 capture

Computational design for enantioselective CO₂ capture: asymmetric frustrated Lewis pairs in epoxide transformations

• Maxime Ferrer,
• Iñigo Iribarren,
• Tim Renningholtz,
• Ibon Alkorta and
• Cristina Trujillo

Beilstein J. Org. Chem. 2024, 20, 2668–2681, doi:10.3762/bjoc.20.224

• File 1). Notably, the CO2 capture exhibits a lower activation barrier compared to the capture of epoxide (+10.0 kcal·mol−1 vs +30.0 kcal·mol−1). Using transition state theory [40] as expressed in Equation 1, the rate constants were calculated for binding to either molecule at 273.0 K, resulting in k1

• K) suggest a kinetically controlled reaction. To further shift the chemical equilibrium toward CO2 capture, increasing steric hindrance at the epoxide was explored by introducing bulky substituents into the scaffold. This resulted in an increase in activation barriers for adduct formation. Including

• , fourteen FLP scaffolds have been evaluated (Figure 3), focussing specifically on N/B and P/B FLPs because of their widespread application in this field, especially considering the initial step involving CO2 capture [6][12][21]. Selection of the scaffolds and substituents Volcano plots were introduced to

CO₂ complexation with cyclodextrins

• Cecilie Høgfeldt Jessen,
• Jesper Bendix,
• Theis Brock Nannestad,
• Heloisa Bordallo,
• Martin Jæger Pedersen,
• Christian Marcus Pedersen and
• Mikael Bols

Beilstein J. Org. Chem. 2023, 19, 1021–1027, doi:10.3762/bjoc.19.78

• , are studied as potential CO2 capture agents due to their unique molecular structures and high selectivity towards CO2. In this paper we have investigated binding efficiency of a number of cyclodextrins towards CO2. It is found that the crystal structure of α-cyclodextrin with CO2 has a 1:1

• an economic CO2 capture technology. We have therefore studied the binding of CO2 to simple cyclodextrins to determine binding stoichiometry and affinity. It is found that the crystal structure of α-cyclodextrin with CO2 has 1:1 stoichioimetry and that a number of simple and modified cyclodextrins

Activated carbon as catalyst support: precursors, preparation, modification and characterization

• Melanie Iwanow,
• Tobias Gärtner,
• Volker Sieber and
• Burkhard König

Beilstein J. Org. Chem. 2020, 16, 1188–1202, doi:10.3762/bjoc.16.104

• methods from coal precursors. Yang et al. synthesized nitrogen-doped activated carbon from petroleum coke for an enhanced CO2 capture [7]. Pietrzak et al. used high volatile bituminous coals, brown coals and anthracites for modified activated carbon preparation [5][10][11][12]. Lillo-Ródenas et al

Selective formation of a zwitterion adduct and bicarbonate salt in the efficient CO₂ fixation by N-benzyl cyclic guanidine under dry and wet conditions

• Yoshiaki Yoshida,
• Naoto Aoyagi and
• Takeshi Endo

Beilstein J. Org. Chem. 2018, 14, 2204–2211, doi:10.3762/bjoc.14.194

• ambient temperature and pressure [19][20][21][22]. Furthermore, cyclic amidines and guanidines, such as 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), exhibited an excellent efficiency of CO2 capture and release [23][24][25][26][27][28][29][30][31][32][33]. In

• particular, CO2 capture–release behaviors of bicyclic and six-membered cyclic amidine derivatives have been well studied compared to that of five-membered derivatives, because the high ring strain of five-membered cyclic amidine derivatives was unfavorable for the binding between CO2 and the amidine moiety

• [34][35][36][37][38]. However, we found that five-membered cyclic guanidine was excellently efficient for CO2 capture under dry conditions because the trapped CO2 was significantly stabilized as the bicarbonate together with a slight amount of water due to the specific basicity based on the resonance

Novel approach to hydroxy-group-containing porous organic polymers from bisphenol A

• Tao Wang,
• Yan-Chao Zhao,
• Li-Min Zhang,
• Yi Cui,
• Chang-Shan Zhang and
• Bao-Hang Han

Beilstein J. Org. Chem. 2017, 13, 2131–2137, doi:10.3762/bjoc.13.211

• located at 0.68 nm that is different from the other two polymers in Figure 3b is probably the best candidate for CO2 capture. The high carbon dioxide uptake capacity for PPOPs may correspond to the large amount of the hydroxy groups in the PPOPs through the formation of O=C=O(δ–)…H(δ+)–O hydrogen bonds

Biomimetic molecular design tools that learn, evolve, and adapt

• David A Winkler

Beilstein J. Org. Chem. 2017, 13, 1288–1302, doi:10.3762/bjoc.13.125

• of porous materials for hydrogen storage and CO2 capture and reduction Porous materials, such as metal organic frameworks (MOFs), covalent organic frameworks (COFs) and zeolitic imidazolate frameworks (ZIFs) are attracting much interest because of the large numbers of bespoke materials that can be

Robust C–C bonded porous networks with chemically designed functionalities for improved CO₂ capture from flue gas

• Damien Thirion,
• Joo S. Lee,
• Ercan Özdemir and
• Cafer T. Yavuz

Beilstein J. Org. Chem. 2016, 12, 2274–2279, doi:10.3762/bjoc.12.220

• Technology (KAIST), Guseong Dong, Yuseong Gu, Daejeon 305–701, Korea 10.3762/bjoc.12.220 Abstract Effective carbon dioxide (CO2) capture requires solid, porous sorbents with chemically and thermally stable frameworks. Herein, we report two new carbon–carbon bonded porous networks that were synthesized

• COP-156-amine showed fast and increased CO2 uptake under simulated moist flue gas conditions compared to the starting network and usual industrial CO2 solvents, reaching up to 7.8 wt % uptake at 40 °C. Keywords: C–C bond; CO2 capture; microporous materials; porous polymers; postmodification

• pressure of CO2 in flue gas emission) and 273 K, the uptake is slightly higher than the starting COP-156. The chemisorptive behavior and stronger binding affinity is reflected in the higher Qst value of 49.9 kJ mol−1. The moderate binding energy is optimal for CO2 capture, as too strong binding requires

Hydroxy-functionalized hyper-cross-linked ultra-microporous organic polymers for selective CO₂ capture at room temperature

• Partha Samanta,
• Priyanshu Chandra and
• Sujit K. Ghosh

Beilstein J. Org. Chem. 2016, 12, 1981–1986, doi:10.3762/bjoc.12.185

• study the CO2 capture, but the need of high energy to regenerate the amine solutions after CO2 capture, hinders their applications further [2]. In the domain of porous materials, zeolites, metal-organic frameworks (MOFs), cage molecules, etc. have been introduced for selective uptake of CO2 [3][4][5

• polymers have been applied in the field of gas storage, catalysis, separation and recently also in CO2 capture [29][30][31][32]. The increasing environmental pollution due to carbon dioxide, urges us to develop new materials with high stability, which are cost-effective and demonstrate a high efficiency in

• CO2 capture. Based on the interaction of Lewis basic sites with carbon dioxide it has been observed that porous materials functionalised with –NH2 groups or –OH groups exhibit a selective uptake of CO2 in contrast to other gases [33][34] (Scheme 1). Inspired by this we have designed and synthesized

CO₂ Chemistry

• Thomas E. Müller and
• Walter Leitner

Beilstein J. Org. Chem. 2015, 11, 675–677, doi:10.3762/bjoc.11.76

• efficient systems for CO2 capture are being developed on the basis of amine-functionalised ionic liquids where zwitterionic adduct formation is the key to higher efficiency [13]. Furthermore, many physical properties of carbon dioxide are outstanding, making supercritical carbon dioxide a solvent like no

Efficient CO₂ capture by tertiary amine-functionalized ionic liquids through Li⁺-stabilized zwitterionic adduct formation

• Zhen-Zhen Yang and
• Liang-Nian He

Beilstein J. Org. Chem. 2014, 10, 1959–1966, doi:10.3762/bjoc.10.204

• flue gas formed by combustion of fossil fuel is a critical part of efforts directed towards the stabilization of atmospheric greenhouse gas levels [1]. In recent years, there has been intense research worldwide aimed at the development of various processes and technologies for efficient CO2 capture

• ) stoichiometry for the CO2 capacity to 1:1 is an essential prerequisite for a breakthrough in absorption techniques [23]. In this respect, task-specifically designed absorbents have been successfully synthesized from AAs and applied for 1:1 CO2 capture through a carbamic acid formation pathway (Scheme 1a, step 1

• CO2 capture, by simple mixing of equimolar amounts of alkanolamines with LiNTf2 [38]. The strong complexation of alkali metal cations by crown ethers could be used to achieve equimolar CO2 absorption in systems containing crown ethers and easily available alkali metal salts of amino acids, resulting

Supercritical carbon dioxide: a solvent like no other

• Jocelyn Peach and
• Julian Eastoe

Beilstein J. Org. Chem. 2014, 10, 1878–1895, doi:10.3762/bjoc.10.196

• [26]. As well as looking to modify physicochemical properties of scCO2 to increase its appeal as a solvent, the ability to control properties will aid CO2 use in other avenues, including atmospheric CO2 capture, sequestration and storage as well as enhanced oil recovery processes (EOR) [28][29