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Boadi F, Sampson NS. Long-Range Kinetic Effects on the Alternating Ring Opening Metathesis of Bicyclo[4.2.0]oct-6-ene-7-carboxamides and Cyclohexene. ACS ORGANIC & INORGANIC AU 2023; 3:233-240. [PMID: 37545655 PMCID: PMC10401671 DOI: 10.1021/acsorginorgau.3c00013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 05/16/2023] [Accepted: 05/17/2023] [Indexed: 08/08/2023]
Abstract
We report an investigation of rates of ruthenium-catalyzed alternating ring opening metathesis (AROM) of cyclohexene with two different Ru-cyclohexylidene carbenes derived from bicyclo[4.2.0]oct-6-ene-7-carboxamides (A monomer) that bear different side chains. These monomers are propylbicyclo[4.2.0]oct-6-ene-7-carboxamide and N-(2-(2-ethoxyethoxy)ethanylbicyclo[4.2.0]oct-6-ene-7-carboxamide. The amide substitution of these monomers directly affects both the rate of the bicyclo[4.2.0]oct-6-ene-7-carboxamide ring opening and the rate of reaction of the resulting carbene with cyclohexene (B monomer). The resulting Ru-cyclohexylidenes underwent reversible ring opening metathesis with cyclohexene. However, the thermodynamic equilibrium disfavored cyclohexene ring opening. Utilization of triphenylphosphine forms a more stable PPh3 ligated complex, which suppresses the reverse ring closing reaction and allowed direct measurements of the forward rate constants for formation of various A-B and A-B-A' complexes through carbene-catalyzed ring-opening metathesis and thus gradient polymer structure-determining steps. The relative rate of the propylbicyclo[4.2.0]oct-6-ene-7-carboxamide ring opening is 3-fold faster than that of the N-(2-(2-ethoxyethoxy)ethanylbicyclo[4.2.0]oct-6-ene-7-carboxamide. In addition, the rate of cyclohexene ring-opening catalyzed by the propyl bicyclooctene is 1.4 times faster than when catalyzed by the ethoxyethoxy bicyclooctene. Also, the subsequent rates of bicyclo[4.2.0]oct-6-ene-7-carboxamide ring opening by propyl-based Ru-hexylidene are 1.6-fold faster than ethoxyethoxy-based Ru-hexylidene. Incorporation of the rate constants into reactivity ratios of bicyclo[4.2.0]amide-cyclohexene provides prediction of copolymerization kinetics and gradient copolymer structures.
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2
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Tashiro K, Akiyama M, Kashiwagi K, Okazoe T. The Fluorocarbene Exploit: Enforcing Alternation in Ring-Opening Metathesis Polymerization. J Am Chem Soc 2023; 145:2941-2950. [PMID: 36701256 DOI: 10.1021/jacs.2c11373] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Fluoroalkenes are known to be notoriously reluctant substrates for olefin metathesis due to the generation of thermodynamically stable Fischer-type fluorocarbene intermediates, which invariably fail to undergo further reaction. In the present disclosure, we find that fluorine substitution on the sp2 carbon also strictly suppresses homopolymerization of norbornene derivatives (NBEs), and this can be harnessed to achieve alternating ring-opening metathesis polymerization (ROMP) with an appropriately electron-rich comonomer. Dihydrofuran (DHF) is thereby shown to undergo alternating ROMP with fluorinated norbornenes, the perfectly alternating structure of the resulting copolymer having been unambiguously elucidated by 1H, 19F, and 13C NMR analyses. Furthermore, we find that the degradability of the resultant copolymers in acidic media via hydrolysis of enol ether moieties in the backbone can be predictably modulated by the number of fluorine atoms present in the NBE comonomer, affording an opportunity to engage with the desirable physical properties of fluorinated polymers while limiting their attendant environmental degradability issues.
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Affiliation(s)
- Kaoru Tashiro
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Midori Akiyama
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kimiaki Kashiwagi
- AGC Inc., Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Takashi Okazoe
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.,AGC Inc., Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
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3
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Yu X, Li G, Zheng B, Youn G, Jiang T, Quah SP, Laughlin ST, Sampson NS, Bhatia SR. Controlling Rheology of Fluid Interfaces through Microblock Length of Sequence-Controlled Amphiphilic Copolymers. MACROMOL CHEM PHYS 2022; 223:2200110. [PMID: 36588980 PMCID: PMC9799073 DOI: 10.1002/macp.202200110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Indexed: 01/05/2023]
Abstract
Previous studies have demonstrated that films of sequence-controlled amphiphilic copolymers display contact angles that depend on microblock size. This suggests that microblock length may provide a means of tuning surface and interfacial properties. In this work, the interfacial rheology of a series of sequence-controlled copolymers, prepared through the addition of bicyclo[4.2.0]oct-1(8)-ene-8-carboxamide (monomer A) and cyclohexene (monomer B) to generate sequences up to 24 monomeric units composed of (A m B n ) i microblocks, where m, n, and i range from 1 to 6. Interfacial rheometry is used to measure the mechanical properties of an air-water interface with these copolymers. As the microblock size increases, the interfacial storage modulus, G', increases, which may be due to an increase in the size of interfacial hydrophobic domains. Small-angle X-ray scattering shows that the copolymers have a similar conformation in solution, suggesting that any variations in the mechanics of the interface are due to assembly at the interface, and not on solution association or bulk rheological properties. This is the first study demonstrating that microblock size can be used to control interfacial rheology of amphiphilic copolymers. Thus, the results provide a new strategy for controlling the dynamics of fluid interfaces through precision sequence-controlled polymers.
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Affiliation(s)
- Xiaoxi Yu
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
| | - Guofang Li
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
| | - Bingqian Zheng
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
| | - Gyusaang Youn
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
| | - Ting Jiang
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
| | - Suan P Quah
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
| | - Scott T Laughlin
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
| | - Nicole S Sampson
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
| | - Surita R Bhatia
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
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4
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Pal S, Mandal I, Kilbinger AFM. Controlled Alternating Metathesis Copolymerization of Terminal Alkynes. ACS Macro Lett 2022; 11:847-853. [PMID: 35736023 DOI: 10.1021/acsmacrolett.2c00258] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Terminal alkynes display high reactivity toward Ru-carbene metathesis catalysts. However, the formation of a less reactive bulky carbene hinders their homopolymerization. Simultaneously, the higher reactivity of alkynes does not allow efficient cross propagation with sterically less-hindered cycloalkene monomers, resulting in inefficient copolymerization. Nonetheless, terminal alkynes undergo rapid cross-metathesis with vinyl ethers. Therefore, an efficient cross propagation can be achieved with terminal alkynes and cyclic enol ether monomers. Here, we show that terminal alkyne derivatives can be copolymerized in an alternating fashion with 2,3-dihydrofuran using Grubbs' third generation catalyst (G3). A linear relationship of the number-average molecular weight versus monomer to initiator ratio and block copolymer synthesis confirmed a controlled copolymerization. The SEC and NMR analyses of the synthesized copolymers confirmed the excellent control over molecular weight and exclusive alternating nature of the copolymer. The regioselective chain transfer of G3 to vinyl ether and the high reactivity of the Fischer-type Ru carbene toward terminal alkynes was also exploited for polymer conjugation. Finally, the presence of an acid labile backbone functionality in the synthesized alternating copolymers allowed complete degradation of the copolymer within a short time interval which was confirmed by SEC analyses.
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Affiliation(s)
- Subhajit Pal
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Indradip Mandal
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Andreas F M Kilbinger
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
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5
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Hu C, Pang X, Chen X. Self-Switchable Polymerization: A Smart Approach to Sequence-Controlled Degradable Copolymers. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00085] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chenyang Hu
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
| | - Xuan Pang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
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6
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Boadi FO, Sampson NS. Gradient Copolymer Prepared from Alternating Ring-Opening Metathesis of Three Monomers. Polym Chem 2021; 12:5613-5622. [PMID: 35480962 PMCID: PMC9038129 DOI: 10.1039/d1py00690h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
Bicyclo[4.2.0]oct-6-ene-7-carboxamide is a simple but highly strained olefin monomer which forms an alternating copolymer with cyclohexene in the presence of N-heterocyclic carbene-ruthenium catalyst. [4.2.0] moiety with bulky substituent on C7 that chelate with the ruthenium center of the catalyst propagate more slowly than monomers that cannot chelate. Accordingly, the reactivity ratio of N-propylbicyclo[4.2.0]oct-6-ene-7-carboxamide with cyclohexene is significantly higher than that of N-(2-(2-ethoxyethoxy)ethan)-bicyclo[4.2.0]oct-6-ene-7-carboxamide with cyclohexene. A copolymerization involving the three monomers in a 1:1:2 (propyl:ethylene glycol:cyclohexene) molar ratio formed a gradient copolymer in a one-pot reaction. Surface hydrophobicity, topology, and thermal properties of the gradient copolymer were similar to those of a copolymer comprised of six microblocks prepared through multistep synthesis by alternately employing the same two bicyclo[4.2.0]oct-6-ene-7-carboxamides in each microblock. The properties of the gradient copolymer were distinct from a copolymer comprised of two larger blocks based on the same bicyclo[4.2.0]oct-6-ene-7-carboxamides.
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Affiliation(s)
- Francis O Boadi
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Nicole S Sampson
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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7
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Pal S, Alizadeh M, Kong P, Kilbinger AFM. Oxanorbornenes: promising new single addition monomers for the metathesis polymerization. Chem Sci 2021; 12:6705-6711. [PMID: 34040745 PMCID: PMC8133030 DOI: 10.1039/d1sc00036e] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 03/31/2021] [Indexed: 12/22/2022] Open
Abstract
Higher ring-opening metathesis propagation rates of exo-norbornene derivatives over endo derivatives are well established in the literature. Here, we report for the first time that endo-isomers of oxanorbornene derivatives show higher reactivity towards ring-opening metathesis with Grubbs' 3rd generation catalyst (G3) than the corresponding exo-isomers. A very high selectivity for the reaction of G3 with endo over the exo-isomers could be shown. Furthermore, single molecular addition of the endo-isomers with G3 was observed. On the other hand, pure exo-monomers could successfully be homopolymerized. Mixtures of exo- and endo- monomers, however, prevented the homopolymerization of the exo-monomer. Such mixtures could successfully be copolymerized with cycloalkenes, resulting in alternating copolymers. An oxanorbornadiene derivative could be shown to undergo single addition reactions, exploited in the preparation of mono-end functional ROMP polymers. These could be selectively derivatized via endgroup selective thiol-ene click reactions. A thiol and alcohol end functional ROMP polymer was synthesized, and the efficient end functionalization was confirmed by 1H NMR spectroscopy and MALDI-ToF spectrometry.
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Affiliation(s)
- Subhajit Pal
- Department of Chemistry, University of Fribourg Chemin du Musée 9 1700 Fribourg Switzerland
| | - Mahshid Alizadeh
- Department of Chemistry, University of Fribourg Chemin du Musée 9 1700 Fribourg Switzerland
| | - Phally Kong
- Department of Chemistry, University of Fribourg Chemin du Musée 9 1700 Fribourg Switzerland
| | - Andreas F M Kilbinger
- Department of Chemistry, University of Fribourg Chemin du Musée 9 1700 Fribourg Switzerland
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8
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Zhang J, Yu X, Zheng B, Shen J, Bhatia SR, Sampson NS. Cationic Amphiphilic Alternating Copolymers with Tunable Morphology. Polym Chem 2020; 11:5424-5430. [PMID: 33281956 PMCID: PMC7709945 DOI: 10.1039/d0py00782j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
A series of ionic amphiphilic alternating copolymers were characterized via SAXS, TEM and DLS to help understand factors that could potentially affect self-assembly, including the degree of polymerization, the length of hydrophobic spacers between ionic units, the distance between charged groups and polymer backbone, solvent envrioment and counterions.
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Affiliation(s)
- Jingling Zhang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Xiaoxi Yu
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Bingqian Zheng
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Jiachun Shen
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Surita R Bhatia
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Nicole S Sampson
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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9
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Boadi FO, Zhang J, Yu X, Bhatia S, Sampson NS. Alternating Ring-Opening Metathesis Polymerization Provides Easy Access to Functional and Fully Degradable Polymers. Macromolecules 2020; 53:5857-5868. [PMID: 33776145 PMCID: PMC7993654 DOI: 10.1021/acs.macromol.0c01051] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Polymers with hydrolyzable groups in their backbones have numerous potential applications in biomedicine, lithography, energy storage and electronics. In this study, acetal and ester functionalities were incorporated into the backbones of copolymers by means of alternating ring-opening metathesis polymerization catalyzed by third-generation Grubbs ruthenium catalyst. Specifically, combining large-ring (7-10 atoms) cyclic acetal or lactone monomers with bicyclo[4.2.0]oct-1(8)-ene-8-carboxamide monomers provided perfectly alternating copolymers with acetal or ester functionality in the backbones and low to moderate molecular weight distribution (Đ M = 1.2-1.6). Copolymers containing ester and acetal backbones hydrolyzed to significant extent under basic condition (pH 13) and acidic conditions (pH ≤ 5) respectively to yield the expected by-products within 30 hours at moderate temperature. Unlike the copolymer with all-carbon backbone, copolymers with heteroatom-containing backbone exhibited viscoelastic behavior with crossover frequency which decreases as the size of the R group on the acetal increases. In contrast, the glass transition temperature (T g) decreases as the size of the R group decreases. The rate of hydrolysis of the acetal copolymers was also dependent on the R group. Thus, ruthenium-catalyzed alternating ring-opening metathesis copolymerization provides heterofunctional copolymers whose degradation rates, glass transition temperatures, and viscoelastic moduli can be controlled.
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Affiliation(s)
- Francis O. Boadi
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400
| | - Jingling Zhang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794-2275
| | - Xiaoxi Yu
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400
| | - Surita Bhatia
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400
| | - Nicole S Sampson
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400
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10
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Zhao S, Battiston KG, Santerre JP. Sequence-Controlled Polyurethane Block Copolymer Displays Differentiated Immunoglobulin-G Adsorption That Influences Human Monocyte Adhesion and Activity. ACS Biomater Sci Eng 2020; 6:4433-4445. [PMID: 33455182 DOI: 10.1021/acsbiomaterials.0c00496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ability to specify an adsorbed protein layer through the polymer chemistry design of immunomodulatory biomaterials is important when considering a desired immune response, such as reducing pro-inflammatory activity. Limited work has been undertaken to elucidate the role of monomer sequence in this process, when copolymeric systems are involved. In this study, we demonstrate the advantage of an alternating radical copolymerization strategy as opposed to a random statistical copolymerization to order monomers in the synthesis of degradable polar-hydrophobic-ionic polyurethanes (D-PHI), biomaterials originally designed to reduce inflammatory monocyte activation. A monomer system consisting of a vinyl-terminated polyurethane cross-linker, maleic acid (MA), and ethyl vinyl ether (EVE), not only generated a diverse chemical environment of polar, hydrophobic, and ionic functional groups, but also formed a charge transfer complex (CTC) reactive to alternating polymerizations. Conversion of MA and EVE occurred in a constant proportion regardless of monomer availability, a phenomenon not observed in conventional D-PHI formulations. For feeds with unequal molar quantities of MA and EVE, the final conversion was limited and proportional to the limiting reagent, leading to an overall higher polyurethane cross-linker content. The presence of a reactive CTC was also found to limit the monomer conversion. Compared to a D-PHI with random monomer arrangement using methacrylic acid (MAA) and methyl methacrylate (MMA), a reduction in Fab region exposure from adsorbed immunoglobulin G and a reduction in average adherent monocyte activity were found in the sequence-controlled version. These results represent the first example of using an alternating copolymerization approach to generate regularly defined polymer chemistries in radical chain-growth biomaterials for achieving immunomodulation, and highlight the importance of considering sequence control as a design strategy for future immunomodulatory biomaterial development.
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Affiliation(s)
- Spencer Zhao
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5G 1M1, Canada
| | - Kyle G Battiston
- Ted Rogers Centre for Heart Research, Faculty of Dentistry, University of Toronto, Toronto, Ontario M5G 1M1, Canada
| | - J Paul Santerre
- Ted Rogers Centre for Heart Research, Faculty of Dentistry, University of Toronto, Toronto, Ontario M5G 1M1, Canada
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11
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Nishimori K, Ouchi M. AB-alternating copolymers via chain-growth polymerization: synthesis, characterization, self-assembly, and functions. Chem Commun (Camb) 2020; 56:3473-3483. [DOI: 10.1039/d0cc00275e] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In this review, four topics on alternating copolymers synthesized via chain-growth polymerization are reviewed: (1) how to control the alternating sequence; (2) sequence analysis; (3) self-assembly; and (4) functions.
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Affiliation(s)
- Kana Nishimori
- Department of Polymer Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Makoto Ouchi
- Department of Polymer Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
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12
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Su JK, Jin Z, Zhang R, Lu G, Liu P, Xia Y. Tuning the Reactivity of Cyclopropenes from Living Ring-Opening Metathesis Polymerization (ROMP) to Single-Addition and Alternating ROMP. Angew Chem Int Ed Engl 2019; 58:17771-17776. [PMID: 31571344 DOI: 10.1002/anie.201909688] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 09/08/2019] [Indexed: 11/09/2022]
Abstract
Ring-opening metathesis polymerization (ROMP) has become one of the most important living polymerizations. Cyclopropenes (CPEs) remain underexplored for ROMP. Described here is that the simple swap of 1-methyl to 1-phenyl on 1-(benzoyloxymethyl)CPEs elicited strikingly different modes of reactivity, switching from living polymerization to either selective single-addition or living alternating ROMP. The distinct reactivity stems from differences in steric repulsions at the Ru alkylidene after CPE ring opening. Possible olefin or oxygen chelation from ring-opened CPE substituents was also observed to significantly affect the rate of propagation. These results demonstrate the versatility of CPEs as a new class of monomers for ROMP, provide mechanistic insights for designing new monomers with rare single-addition reactivity, and generate a new functionalizable alternating copolymer scaffold with controlled molecular weight and low dispersity.
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Affiliation(s)
- Jessica K Su
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - Zexin Jin
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - Rui Zhang
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Gang Lu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Yan Xia
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
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13
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2018. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.213051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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14
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Yi N, Chen TTD, Unruangsri J, Zhu Y, Williams CK. Orthogonal functionalization of alternating polyesters: selective patterning of (AB) n sequences. Chem Sci 2019; 10:9974-9980. [PMID: 32015813 PMCID: PMC6968736 DOI: 10.1039/c9sc03756j] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 09/10/2019] [Indexed: 11/21/2022] Open
Abstract
Precision functionalized polyesters, with defined monomer sequences, are prepared using an orthogonal post-polymerization strategy. These polyesters can be synthesized from bio-derived monomers and are targeted to degrade, by hydrolysis processes, to biocompatible diols and diacids; the new structures enabled by this methodology would be very difficult to synthesize by alternative strategies. A series of 9 well-defined highly alternating AB-type copolyesters, containing terminal and internal alkene functionalities, are synthesized in high conversions by the ring-opening copolymerization of epoxides and cyclic anhydrides. Firstly, the polyesters are functionalized by a selective hydroboration-oxidation reaction to exclusively and quantitatively hydroxylate the terminal alkenes, leaving the alternating internal alkenes unreacted. Subsequently, the internal alkenes are quantitatively transformed into carboxylic acid, amine, alkyl and oligo-ether groups, by thiol-ene reactions, to afford AB polyesters with alternating functional substituents. Three polyesters showing alternating hydrophilic/hydrophobic side-chain sequences self-assemble in solution to form nanostructures that are characterized using transmission electron microscopy and dynamic light scattering methods (R h = 100-300 nm). The selective patterning methodology provides facile, efficient and orthogonal functionalization of alternating polyesters with near-quantitative (AB) n repeat sequences. The method is expected to be generalizable to other polymers and provides access to completely new AB alternating structures with the potential to exploit ligand multi-valency and adjacency to enhance properties.
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Affiliation(s)
- Ni Yi
- Chemistry Research Laboratory , Department of Chemistry , University of Oxford , 12 Mansfield Road , Oxford , OX1 3TA , UK .
| | - Thomas T D Chen
- Chemistry Research Laboratory , Department of Chemistry , University of Oxford , 12 Mansfield Road , Oxford , OX1 3TA , UK .
| | - Junjuda Unruangsri
- Department of Chemistry , Imperial College London , South Kensington Campus , London , SW7 1AZ , UK
| | - Yunqing Zhu
- Department of Chemistry , Imperial College London , South Kensington Campus , London , SW7 1AZ , UK
| | - Charlotte K Williams
- Chemistry Research Laboratory , Department of Chemistry , University of Oxford , 12 Mansfield Road , Oxford , OX1 3TA , UK .
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Affiliation(s)
- Dylan J. Walsh
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Michael G. Hyatt
- Department of Chemistry, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Susannah A. Miller
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Damien Guironnet
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
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16
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Su JK, Jin Z, Zhang R, Lu G, Liu P, Xia Y. Tuning the Reactivity of Cyclopropenes from Living Ring‐Opening Metathesis Polymerization (ROMP) to Single‐Addition and Alternating ROMP. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909688] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jessica K. Su
- Department of Chemistry Stanford University Stanford CA 94305 USA
| | - Zexin Jin
- Department of Chemistry Stanford University Stanford CA 94305 USA
| | - Rui Zhang
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Gang Lu
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Peng Liu
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Yan Xia
- Department of Chemistry Stanford University Stanford CA 94305 USA
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17
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Elling BR, Su JK, Feist JD, Xia Y. Precise Placement of Single Monomer Units in Living Ring-Opening Metathesis Polymerization. Chem 2019. [DOI: 10.1016/j.chempr.2019.07.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Paradiso V, Grisi F. Ruthenium‐Catalyzed Alternating Ring‐Opening Metathesis Copolymerization of Norborn‐2‐ene with Cyclic Olefins. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900565] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Veronica Paradiso
- Dipartimento di Chimica e Biologia “Adolfo Zambelli” Università di Salerno Via Giovanni Paolo II 132 I-84084 Fisciano, Salerno Italy
| | - Fabia Grisi
- Dipartimento di Chimica e Biologia “Adolfo Zambelli” Università di Salerno Via Giovanni Paolo II 132 I-84084 Fisciano, Salerno Italy
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Nowalk JA, Swisher JH, Meyer TY. Influence of Short-Range Scrambling of Monomer Order on the Hydrolysis Behaviors of Sequenced Degradable Polyesters. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00480] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Jamie A. Nowalk
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Jordan H. Swisher
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Tara Y. Meyer
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15219, United States
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20
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Wang J, Wang R, Gu Y, Sourakov A, Olsen BD, Johnson JA. Counting loops in sidechain-crosslinked polymers from elastic solids to single-chain nanoparticles. Chem Sci 2019; 10:5332-5337. [PMID: 31191890 PMCID: PMC6540913 DOI: 10.1039/c9sc01297d] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 04/23/2019] [Indexed: 01/06/2023] Open
Abstract
The vast differences in material properties accessible via crosslinking of sidechain-functionalized polymers are driven by topology. For example, vulcanized rubbery networks feature intermolecular connections and loop topologies of various orders while single-chain nanoparticles (SCNPs) are comprised, in principle, entirely of primary loops. Despite this fact, precise quantification of loops in sidechain crosslinked polymers has not been accomplished. Here, it is demonstrated that by introducing cleavable linkers and mass labels onto the pendant functional groups of reactive polymers, the number of primary loops in sidechain crosslinked materials ranging from rubbery networks (gels) to soluble SCNPs can be precisely quantified. This study sheds new light on the topology of sidechain-crosslinked networks, providing design principles for augmenting the properties of this industrially and academically important class of materials through topological control.
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Affiliation(s)
- Junpeng Wang
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Rui Wang
- Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Yuwei Gu
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Alexandra Sourakov
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Bradley D Olsen
- Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
| | - Jeremiah A Johnson
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA 02139 , USA .
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21
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Buchmeiser MR. Functional Precision Polymers via Stereo- and Regioselective Polymerization Using Group 6 Metal Alkylidene and Group 6 and 8 Metal Alkylidene N-Heterocyclic Carbene Complexes. Macromol Rapid Commun 2018; 40:e1800492. [PMID: 30118168 DOI: 10.1002/marc.201800492] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 07/09/2018] [Indexed: 12/24/2022]
Abstract
The concepts of functional precision polymers and the latest accomplishments in their synthesis are summarized. Synthetic concepts based on chain growth polymerization are compared to iterative synthetic approaches. Here, the term "functional precision polymers" refers to polymers that are not solely hydrocarbon-based but contain functional groups and are characterized by a highly ordered primary structure. If insertion polymerization is used for their synthesis, olefin metathesis-based polymerization techniques, that is, ring-opening metathesis polymerization (ROMP), acyclic diene metathesis (ADMET) polymerization, and the regio- and stereoselective cyclopolymerization of α,ω-diynes are almost exclusively applied. Particularly with regio- and stereospecific ROMP and with cyclopolymerization, the synthesis of tactic polymers and copolymers with high regio-, stereo-, and sequence control can be accomplished; however, it requires carefully tailored transition metal catalysts. The fundamental synthetic concepts and strategies are outlined.
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Affiliation(s)
- Michael R Buchmeiser
- Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55,, D-70569, Stuttgart, Germany
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