Article
Chemistry, Organic
Sebastian Fischer, Terrence-Thang H. Nguyen, Andreas Ratzenboeck, Huw M. L. Davies, Oliver Reiser
Summary: A stereoselective, solvent- and metal-free method for endocyclic C-C bond cleavage of monocyclopropanated cyclopentadienes mediated by strong acids has been developed. It leads to the formation of highly functionalized six-membered carbocycles with high stereocontrol. The critical step involves the formation of a cyclopropyl carbocation that undergoes endocyclic ring opening through an SN2'-type attack of various nucleophiles. Subsequent synthetic transformations demonstrate the versatility of the resulting cyclohexenes for the synthesis of compounds with nonconventional substitution patterns.
Article
Nanoscience & Nanotechnology
Yuanjing Zhang, Quandong Hou, Si Wang, Enze Xu, Shiquan Zhao, Feng Li, Yusen Yang, Min Wei
Summary: This study reports a metal-support synergistic catalyst (Pd-mWO( x )/MMT) for the hydroalkylation of benzene, which shows excellent catalytic performance. The formation of interfacial sites Pd-(WO x )-H, dependent on the interaction between Pd and WO x , was confirmed by various techniques. The optimized catalyst (Pd-15WO( x )/MMT) achieved a CHB yield of up to 45.1%, the highest level among state-of-the-art catalysts. In situ FT-IR and control experiments further revealed that the Pd-(WO x )-H structure served as the dual-active site.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Applied
Gabriele Lupidi, Alessandro Palmieri, Marino Petrini
Summary: A novel riboflavin-promoted reaction of primary nitroalkanes coupled with a nitroaldol reaction was discovered, enabling the synthesis of functionalized nitro alcohols under mild reaction conditions. However, secondary nitroalkanes were consumed under the reaction conditions without yielding the expected nitroaldol products.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Chemistry, Physical
Zhi Zhou, Gerard Roelfes
Summary: The article describes a tandem Michael addition/enantioselective protonation reaction catalyzed by an artificial enzyme in water. Through the use of abiological catalytic sites and a Lewis acid Cu(II) complex, high stereocontrol was achieved. This illustrates the potential of exploiting synergistic catalysis in artificial enzymes for challenging reactions.
Article
Chemistry, Physical
Jessica A. Murdzek, Ann Lii-Rosales, Steven M. George
Summary: Thermal atomic layer etching (ALE) of nickel was demonstrated by sequential chlorination and ligand-addition reactions using SO2Cl2 and PMe3. Inspired by the covalent bond classification (CBC) method, surface reactions during thermal Ni ALE formed NiX2L2 products. Etch rates of nickel varied at different temperatures, confirming the success of the ALE process.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Organic
Sajjad Ahmed, Mohammad Yaqoob Bhat, Feroze Hussain, Qazi Naveed Ahmed
Summary: In this study, the activation of diphenyl phosphite by BF3/BF4(-) resulted in the formation of thionium ions from aldehydes and thiophenols. These reactive species then reacted with in situ generated phenol, leading to the synthesis of diarylmethyl thioethers. It was found that the addition of external phenol in the reaction yielded unsymmetrical gem-diarylmethyl thioethers in good yields.
Article
Chemistry, Organic
Le Zhang, Ye Liu, Chao-Xu Li, Lei Zhu, Guo-Yin Xiong, Shi-Lu Fan, Jian-Jun Dai, Hua Xiao
Summary: A phosphine-promoted tandem Diels-Alder reaction using pentadienyl 4-nitrobenzoate as a diene precursor with 3-olefinic oxindoles or CF3-activated ketones as dienophiles has been developed. This method provides a metal-free and step-efficient approach for synthesizing exomethylene-bearing spirooxindoles and dihydropyrans, which are privileged structures found in natural products.
Article
Chemistry, Organic
Hongchen Li, Lidong Shan, Lin Min, Yunxiang Weng, Xinyan Wang, Yuefei Hu
Summary: A novel tandem synthesis of 1,3-disubstituted naphthalenes is developed using TfOH-promoted directed-aldol and Friedel-Crafts reactions. The discovery of a chemoselective directed-aldol reaction between different ketones with alpha-hydrogens enables the efficient creation of new C-C bonds and a benzene ring in one pot.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Rui Li, Feng Zhou, Xiangdi Huang, Jingfeng Zhao, Hongbin Zhang
Summary: In this article, a tandem protocol for the synthesis of highly substituted imidazoles through cascade reactions induced by Pummerer-like rearrangement is reported. This method enables the formation of two carbon-nitrogen bonds and concomitant aromatization under mild reaction conditions, resulting in imidazole derivatives bearing various functional groups. It can be applied for the modification of natural products and pharmaceuticals.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Toktam S. Shirazian, Hossein Zahedian Tejeneki, Ali Nikbakht, Frank Rominger, Saeed Balalaie
Summary: This study presents a novel method for synthesizing functionalized acridines using a base-promoted formal [4+2] cycloaddition reaction. The method exhibits high selectivity and efficiency, making it a valuable approach for the synthesis of acridine backbones.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Qingdong Hu, Chang Guo
Summary: The synthesis of structurally diverse multiligated platinum complexes, characterized by X-ray crystallography, opens up new reaction space and enables faster screening. The Pt/Cu dual catalytic system shows new cooperative reactivity, leading to the asymmetric synthesis of valuable functionalized indoles with good yields and excellent enantioselectivities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Eethamukkala Ubba, Fazlur-Rahman Nawaz Khan, Chitrala Teja, Ramesh Dalavai
Summary: A facile one-pot domino aldol condensation/Michael addition/Sonogashira coupling reaction was developed using a Pd/Cu catalyst system. This methodology allows for the synthesis of highly functionalized compounds in a mild and efficient manner.
POLYCYCLIC AROMATIC COMPOUNDS
(2023)
Article
Chemistry, Physical
Carlos J. Moreno, Karel Hernandez, Simon J. Charnok, Samantha Gittings, Michael Bolte, Jesus Joglar, Jordi Bujons, Teodor Parella, Pere Clapes
Summary: Three enzymatic routes have been reported for the synthesis of gamma-hydroxy-alpha-amino acids through tandem aldol addition-transamination reactions. The resulting chiral molecules can be further transformed into valuable chiral alpha-amino-gamma-butyrolactones, which are important intermediates for pharmaceutical synthesis.
Article
Chemistry, Multidisciplinary
Valentina A. Ol'shevskaya, Victoria M. Alpatova, Anton V. Makarenkov, Elena G. Kononova, Alexander F. Smol'yakov, Alexander S. Peregudov, Evgeny G. Rys
Summary: Carborane maleimides were synthesized with good yields through thermal cyclization of maleamic acids prepared from the reaction of 3-amino-o-carborane with maleic or 3-bromomaleic anhydrides. The selective reactivity of synthesized maleimides towards S-nucleophiles was demonstrated, leading to the development of potential candidates for biological applications or new materials with variation in substitution patterns.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Organic
Maryam Nazarahari, Javad Azizian
Summary: In this study, a highly efficient and easy method for synthesizing imidazolecarboxylate salt was used. The reaction between alpha-amidino carboxylic acids and alpha-halo ketones with KHCO3 in THF under reflux conditions resulted in the production of high-yield products. This targeted synthesis of imidazole with a carboxylic acid group is popular in catalyst manufacturing due to its biological properties as a ligand. Additionally, the GAP chemistry technique allowed for purification of all products without the need for column chromatography.
LETTERS IN ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Kelsie E. Wentz, Andrew Molino, Lucas A. Freeman, Diane A. Dickie, David J. D. Wilson, Robert J. Gilliard
Summary: The first structurally characterized trioxaborinanone (2) is obtained by the reaction of a 9-carbene-9borafluorene monoanion with carbon dioxide. Heating or irradiating compound 2 releases carbon monoxide (CO) and forms a luminescent dioxaborinanone (3). Carbon monoxide releasing molecules (CORMs) are of interest for their ability to deliver a specific amount of CO. Due to the observed fluorescence enhancement upon conversion to 3, CORM 2 can be used to visually observe CO loss under thermal or photochemical conditions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Kelsie E. Wentz, Andrew Molino, Lucas A. Freeman, Diane A. Dickie, David J. D. Wilson, Robert J. J. Gilliard Jr
Summary: In this study, dianionic 10-membered bora-crown ethers were synthesized for the first time, and their reaction mechanism and electronic structure were elucidated through experiments and theoretical calculations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Inorganic & Nuclear
Alma Araujo Martinez, Christopher P. Landee, Diane A. Dickie, Jan L. Wikaira, Fan Xiao, Mark M. Turnbull
Summary: Three 4-(2'-pyridyl)imidazole (4-pyim) complexes of copper(II) have been synthesized and studied structurally and magnetically. Compound 1 crystallizes in the monoclinic space group P2(1)/n with a four-coordinate Cu(II) forming dimers via semi-coordinate bonds. Compound 2 crystallizes in the triclinic space group P - 1 with five-coordinate Cu(II) ions and an extensive hydrogen bonding network. Compound 3 crystallizes in the monoclinic space group Cc with both four- and five-coordinate Cu(II) ions and shows hydrogen bonding and pi-stacking interactions. Magnetic susceptibility data of compound 1 shows modest antiferromagnetic interactions best fit using a honeycomb model.
JOURNAL OF COORDINATION CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Joshua E. Barker, Akachukwu D. Obi, Diane A. Dickie, Robert J. Gilliard
Summary: This study describes the synthesis, molecular structures, reactivities, and computational assessment of dipotassium diboratapentacene isomers (1 and 2). These compounds are the first examples of aromatized diboraacenes with spatially separated boron atoms in different rings of the acene framework. Both 1 and 2 react with carbon dioxide in a diastereoselective carboxylation reaction of the pentacene backbone, likely proceeding via a frustrated Lewis pair-like mechanism. The placement of boron atoms and the reactivity studies provide a platform for later stage functionalization of diboraacenes beyond the central ring of the polycyclic aromatic hydrocarbon core.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Fanji Kong, Pablo Rios, Conner Hauck, Francisco Jose Fernandez-de-Cordova, Diane A. Dickie, Laurel G. Habgood, Amor Rodriguez, T. Brent Gunnoe
Summary: We have demonstrated the dimerization and oligomerization reactions of ethylene using bis(phosphino)boryl supported Ni(II) complexes as catalyst precursors. The addition of alkylaluminum(III) compounds or other Lewis acid additives enhances the activity and selectivity of these Ni(II) complexes, leading to the production of butenes and higher olefins. Our studies suggest that this catalysis involves a cooperative activation of ethylene by the Ni-B unit, resulting in the formation of a key borametallacycle intermediate.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Lyra Macek, Julia C. Bellamy, Kesli Faber, Conor R. Milson, Christopher P. Landee, Diane A. Dickie, Mark M. Turnbull
Summary: A family of eight compounds with the general formula [(C8H9NO)(2)MX2] or [(C8H9NO)(2)(H2O)(2)MX2], where M can be Ni, Co, Cu, Zn and X can be Cl, Br, were studied. The compounds were characterized by various analytical techniques. The compounds exhibited different coordination numbers and structural distortions, and showed magnetic behavior at the nanoscale.
Article
Chemistry, Inorganic & Nuclear
Julia M. Dressel, Emma N. Cook, Shelby L. Hooe, Juan J. Moreno, Diane A. Dickie, Charles W. Machan
Summary: In the face of rising atmospheric carbon dioxide (CO2) emissions from fossil fuel combustion, the hydrogen evolution reaction (HER) continues to attract attention as a method for generating a carbon-neutral energy source. This study reports the electrochemical analysis of a molecular nickel(ii) complex, which acts as an efficient electrocatalyst for the HER with high faradaic efficiency and turnover frequencies. Computational studies suggest that non-covalent interactions between the proton donor and ligand heteroatoms play a crucial role in the electrocatalytic HER mechanism.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Theodore Gerard, Yang Wei, Erwin Weerawardhana, Adriana Lugosan, Matthias Zeller, Diane A. Dickie, Pengfei Li, Wei-Tsung Lee
Summary: A Zn2+ based complex, 3, exhibits enhanced fluorescence emission in the presence of Mg2+. Both fluorescent and computational studies reveal that 3 selectively interacts with Mg2+ due to the optimal cavity size formed by two uncoordinated pyrazole side arms. This research presents a novel approach to the development of fluorescent chemosensors.
Correction
Chemistry, Inorganic & Nuclear
Emma N. Cook, Shelby L. Hooe, Diane A. Dickie, Charles W. Machan
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Amelia G. Reid, Megan E. Moberg, Connor A. Koellner, Juan J. Moreno, Shelby L. Hooe, Kira R. Baugh, Diane A. Dickie, Charles W. Machan
Summary: The rise in atmospheric CO2 concentrations has led to a demand for new strategies to improve the selectivity and activity of electrocatalytic CO2 conversion. The incorporation of redox mediators (RMs) as cocatalysts for enhancing redox transfer has gained attention. Cr-centered complexes with sulfone-based RMs have been shown to enhance CO2 reduction via inner-sphere mechanism. Expanding the aromatic character of the ligand backbone and RM can further enhance coelectrocatalytic activity.
Article
Multidisciplinary Sciences
Justin T. Weatherford-Pratt, Jacob A. Smith, Jeremy M. Bloch, Megan N. Ericson, Jeffery T. Myers, Karl S. Westendorff, Diane A. Dickie, W. Dean Harman
Summary: Friedel-Crafts Arylation, a significant C-C bond forming reaction, can be achieved by coupling two aromatic rings with the aid of a strong acid. However, by coordinating benzene to a tungsten complex, the reaction can proceed without rearomatization or oligomerization, leading to functionalized cyclohexenes.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Samir Kumar Sarkar, Kimberly K. Hollister, Andrew Molino, Akachukwu D. Obi, Chun-Lin Deng, Bi Youan E. Tra, Brennan M. Stewart, Diane A. Dickie, David J. D. Wilson, Robert J. Gilliard
Summary: In this study, we report the ligand-mediated control of boraphenanthrene electronic states, leading to the first structurally characterized examples of neutral bis(9-boraphenanthrene) and its corresponding biradical. These compounds exhibit dual emission in solution and possess a high degree of biradical character.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Jonathan D. Dabbs, Megan N. Ericson, Justin H. Wilde, Rachel F. Lombardo, Earl C. Ashcraft, Diane A. Dickie, W. Dean Harman
Summary: The efficacy of methylphenidate (MPH) as a dopamine receptor agonist makes it a potential therapeutic for cocaine addiction. In this study, scientists explored the functionalization of the piperidine ring, which has not been previously investigated for MPH derivatives. Through a series of reactions, functional groups were successfully added to the C5' position of the piperidyl ring, resulting in a library of potential drug candidates. The structures of these compounds were confirmed through comprehensive analysis.
ACS CENTRAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Grayson Johnson, Moon Young Yang, Chang Liu, Hua Zhou, Xiaobing Zuo, Diane A. Dickie, Sihan Wang, Wenpei Gao, Bukuru Anaclet, Frederic A. Perras, Fuyan Ma, Chenjie Zeng, Da Wang, Sara Bals, Sheng Dai, Zhen Xu, Guoliang Liu, William A. Goddard III, Sen Zhang
Summary: A scalable and generalized approach to synthesizing superstructures assembled from atomically precise nanoclusters has been reported, with a detailed description of the self-assembly mechanism. The chemical tuning of surface ligands controls superstructure disassembly and reassembly, enabling the synthesis of multicomponent superstructures. This research is promising for the preparation of superstructures for use in electronics, plasmonics, magnetics, and catalysis.
Article
Chemistry, Multidisciplinary
Amelia G. Reid, Juan J. Moreno, Shelby L. Hooe, Kira R. Baugh, Isobel H. Thomas, Diane A. Dickie, Charles W. Machan
Summary: Electrocatalytic CO2 reduction is an effective strategy to reduce atmospheric CO2 concentrations and produce valuable chemical products. Enhancing the activity of molecular systems for these reactions can be achieved by co-catalytic use of redox mediators. In this study, we demonstrate the cooperative effect of inner-sphere mechanism in protic conditions and show that modifying the mediator and ligand design can improve the intrinsic and co-catalytic performance of the Cr-centered catalyst. By optimizing the co-electrocatalytic system, we achieved an enhanced activity at lower overpotentials. This work lays the foundation for developing co-catalytic systems for homogeneous electrochemical reactions.