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Kim S, Treacy JW, Nelson YA, Gonzalez JAM, Gembicky M, Houk KN, Spokoyny AM. Arene C-H borylation strategy enabled by a non-classical boron cluster-based electrophile. Nat Commun 2023; 14:1671. [PMID: 36966132 PMCID: PMC10039867 DOI: 10.1038/s41467-023-37258-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 03/08/2023] [Indexed: 03/27/2023] Open
Abstract
Introducing a tri-coordinate boron-based functional group (e.g., boronic ester) into an unactivated C-H bond in the absence of directing groups is an ongoing challenge in synthetic chemistry. Despite previous developments in transition metal-catalyzed and -free approaches, C-H borylation of sterically hindered arenes remains a largely unsolved problem to date. Here, we report a synthetic strategy of a two-step, precious metal-free electrophilic C-H borylation of sterically hindered alkyl- and haloarenes to generate aryl boronic esters. The first step relies on electrophilic aromatic substitution (EAS) induced by cage-opening of Cs2[closo-B10H10], forming a 6-Ar-nido-B10H13 product containing a B-C bond, followed by a cage deconstruction of arylated decaboranes promoted by diols. The combination of these two steps allows for the preparation of aryl boronic esters that are hardly accessible by current direct C-H borylation approaches. This reaction does not require any precious metals, highly-engineered ligands, pre-functionalized boron reagents, or inert conditions. In addition, the unique properties of a non-classical boron cluster electrophile intermediate, B10H13+, afford a regioselectivity with unique steric and electronic control without the undesirable side reactions.
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Affiliation(s)
- Sangmin Kim
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Joseph W Treacy
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Yessica A Nelson
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Jordan A M Gonzalez
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Milan Gembicky
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093, USA
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Alexander M Spokoyny
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
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Haridas A, Bedajna S, Ghosh S. Substitution at B-H vertices of group 5 metallaborane clusters. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2021.122250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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3
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Guan XH, Nie HR, Wang HH, Zhao JY, Wang ZP, Wang R, Liu BF, Zhou GY, Gu Q. High-solubility aromatic polyesters with fluorene and phthalein groups: Synthesis and property. HIGH PERFORM POLYM 2020. [DOI: 10.1177/0954008320912314] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A series of aromatic polyesters bearing fluorene and phthalein groups were synthesized from commercially available 9,9-bis(4-hydroxyphenyl)fluorene (BPF), phenolphthalein, and terephthaloyl chloride through an interfacial polymerization method. The microstructure, molecular weight, morphology, thermal properties, and thermal decomposition mechanism of these aromatic polyesters were investigated. Their mechanical properties were also evaluated. The results suggested that the copolymer compositions were approximately equal to the feed compositions. Moreover, the increase in the BPF unit content increased the glass transition and weight loss temperatures of the aromatic polyesters, owing to the strong rigidity of the bulky fluorene group. All the polymers were amorphous and exhibited good solubility in common organic solvents. Hence, the synthesized polymers could be easily cast into flexible films. The copolymer film samples exhibited better mechanical properties than those of the homopolymers. The tensile strength, Young’s modulus, and elongation at break of the polymers first increased gradually, and then decreased with increasing BPF content. Notably, the copolymers exhibited the best mechanical properties at the BPF content range 30–50%. Owing to their characteristics, these synthesized polymers show great potential for application as high performance membrane materials.
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Affiliation(s)
- Xing-Hua Guan
- College of Chemistry, Jilin University, Changchun, Jilin, China
| | - He-Ran Nie
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China
| | - Hong-Hua Wang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China
| | - Ji-Yong Zhao
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China
| | - Zhi-Peng Wang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China
| | - Rui Wang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China
| | - Bao-Feng Liu
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, China
| | - Guang-Yuan Zhou
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China
| | - Qiang Gu
- College of Chemistry, Jilin University, Changchun, Jilin, China
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Haridas A, Kar S, Raghavendra B, Roisnel T, Dorcet V, Ghosh S. B–H Functionalization of Hydrogen-Rich [(Cp*V)2(B2H6)2]: Synthesis and Structures of [(Cp*V)2(B2X2)2H8] (X = Cl, SePh; Cp* = η5-C5Me5). Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00609] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anagha Haridas
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Sourav Kar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Beesam Raghavendra
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Thierry Roisnel
- Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, F-35000 Rennes, France
| | - Vincent Dorcet
- Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, F-35000 Rennes, France
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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Madhu M, Chen TH, Tseng WL. White-light emission of single carbon dots prepared by hydrothermal carbonization of poly(diallyldimethylammonium chloride): Applications to fabrication of white-light-emitting films. J Colloid Interface Sci 2019; 556:120-127. [DOI: 10.1016/j.jcis.2019.08.049] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 08/13/2019] [Accepted: 08/13/2019] [Indexed: 10/26/2022]
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Zhang Y, Wang T, Wang L, Sun Y, Lin F, Liu J, Duttwyler S. RhIII
-Catalyzed Functionalization of closo
-Dodecaborates by Selective B−H Activation: Bypassing Competitive C−H Activation. Chemistry 2018; 24:15812-15817. [DOI: 10.1002/chem.201803455] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Indexed: 12/29/2022]
Affiliation(s)
- Yuanbin Zhang
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Tao Wang
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Lingyao Wang
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Yuji Sun
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Furong Lin
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Jiyong Liu
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Simon Duttwyler
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
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Chlorination of the terminal hydrogen atoms in the hydrogen-rich group 5 dimetallaboranes (Cp*M) 2 (B 2 H 6 ) 2 (M = Nb, Ta). J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.07.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Axtell JC, Kirlikovali KO, Jung D, Dziedzic RM, Rheingold AL, Spokoyny AM. Metal-Free Peralkylation of the closo-Hexaborate Anion. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00078] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonathan C. Axtell
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 609 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Kent O. Kirlikovali
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 609 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Dahee Jung
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 609 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Rafal M. Dziedzic
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 609 Charles E. Young Drive East, Los Angeles, California 90095, United States
| | - Arnold L. Rheingold
- Department
of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Alexander M. Spokoyny
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, 609 Charles E. Young Drive East, Los Angeles, California 90095, United States
- California
NanoSystems Institute, University of California, Los Angeles, California 90025, United States
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