|
1
|
Qi Y, Ayinla M, Clifford S, Ramström O. Spontaneous and Selective Macrocyclization in Nitroaldol Reaction Systems. J Org Chem 2023. [PMID: 38154053 DOI: 10.1021/acs.joc.3c02148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2023]
Abstract
Through a dynamic polymerization and self-sorting process, a range of lowellane macrocycles have been efficiently generated in nitroaldol systems composed of aromatic dialdehydes and aliphatic or aromatic dinitroalkanes. All identified macrocycles show a composition of two repeating units, resulting in tetra-β-nitroalcohols of different structures. The effects of the building block structure on the macrocyclization process have been demonstrated, and the influence from the solvent has been explored. In general, the formation of the lowellanes was amplified in response to phase-change effects, although solution-phase structures were, in some cases, favored.
Collapse
Affiliation(s)
- Yunchuan Qi
- Department of Chemistry, University of Massachusetts Lowell, One University Ave., Lowell, Massachusetts 01854, United States
| | - Mubarak Ayinla
- Department of Chemistry, University of Massachusetts Lowell, One University Ave., Lowell, Massachusetts 01854, United States
| | - Stephen Clifford
- Department of Chemistry, University of Massachusetts Lowell, One University Ave., Lowell, Massachusetts 01854, United States
| | - Olof Ramström
- Department of Chemistry, University of Massachusetts Lowell, One University Ave., Lowell, Massachusetts 01854, United States
- Department of Chemistry and Biomedical Sciences, Linnaeus University, SE-39182 Kalmar, Sweden
| |
Collapse
|
|
2
|
Isolation of hetero-telechelic polyethylene glycol with groups of different reactivity at the chain ends. Polym J 2022. [DOI: 10.1038/s41428-022-00676-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
|
3
|
Watanabe T, Wang Y, Ono T, Chimura S, Isono T, Tajima K, Satoh T, Sato SI, Ida D, Yamamoto T. Topology and Sequence-Dependent Micellization and Phase Separation of Pluronic L35, L64, 10R5, and 17R4: Effects of Cyclization and the Chain Ends. Polymers (Basel) 2022; 14:1823. [PMID: 35566993 PMCID: PMC9105568 DOI: 10.3390/polym14091823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 04/26/2022] [Accepted: 04/27/2022] [Indexed: 11/16/2022] Open
Abstract
The topology effects of cyclization on thermal phase transition behaviors were investigated for a series of amphiphilic Pluronic copolymers of both hydrophilic-hydrophobic-hydrophilic and hydrophobic-hydrophilic-hydrophobic block sequences. The dye solubilization measurements revealed the lowered critical micelle temperatures (TCMT) along with the decreased micellization enthalpy (ΔHmic) and entropy (ΔSmic) for the cyclized species. Furthermore, the transmittance and dynamic light scattering (DLS) measurements indicated a block sequence-dependent effect on the clouding phenomena, where a profound decrease in cloud point (Tc) was only found for the copolymers with a hydrophilic-hydrophobic-hydrophilic block sequence. Thus, the effect of cyclization on these critical temperatures was manifested differently depending on its block sequence. Finally, a comparison of the linear hydroxy-terminated, methoxy-terminated, and cyclized species indicated the effect of cyclization to be unique from a simple elimination of the terminal hydrophilic moieties.
Collapse
Affiliation(s)
- Tomohisa Watanabe
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan; (T.W.); (Y.W.); (S.C.)
| | - Yubo Wang
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan; (T.W.); (Y.W.); (S.C.)
| | - Tomoko Ono
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan; (T.O.); (T.I.); (K.T.); (T.S.); (S.S.)
| | - Satoru Chimura
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan; (T.W.); (Y.W.); (S.C.)
| | - Takuya Isono
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan; (T.O.); (T.I.); (K.T.); (T.S.); (S.S.)
| | - Kenji Tajima
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan; (T.O.); (T.I.); (K.T.); (T.S.); (S.S.)
| | - Toshifumi Satoh
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan; (T.O.); (T.I.); (K.T.); (T.S.); (S.S.)
| | - Shin-ichiro Sato
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan; (T.O.); (T.I.); (K.T.); (T.S.); (S.S.)
| | - Daichi Ida
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura 615-8510, Kyoto, Japan;
| | - Takuya Yamamoto
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan; (T.O.); (T.I.); (K.T.); (T.S.); (S.S.)
| |
Collapse
|
|
4
|
Takashima R, Aoki D, Otsuka H. Synthetic Strategy for Mechanically Interlocked Cyclic Polymers via the Ring-Expansion Polymerization of Macrocycles with a Bis(hindered amino)disulfide Linker. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rikito Takashima
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Daisuke Aoki
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
- JST-PRESTO, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Hideyuki Otsuka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| |
Collapse
|
|
5
|
Aoki D, Aibara G, Takata T. Reversible cyclic-linear topological transformation using a long-range rotaxane switch. Polym Chem 2021. [DOI: 10.1039/d1py01197a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A reversible linear-cyclic topological transformation of polymers facilitated by a long-range rotaxane switch.
Collapse
Affiliation(s)
- Daisuke Aoki
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro, Tokyo 152-8552, Japan
| | - Gota Aibara
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro, Tokyo 152-8552, Japan
| | - Toshikazu Takata
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro, Tokyo 152-8552, Japan
- JST-CREST, Ookayama, Meguro, Tokyo 152-8552, Japan
- Graduate School of Advanced Science and Engineering, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| |
Collapse
|
|
6
|
Abstract
Pseudo-ladder polymers composed of stiff ladder and reversibly photocleavable backbone linkages and their graft copolymers have been synthesized. Micelles constructed from the graft copolymers exhibited growth in their sizes upon photoirradiation.
Collapse
Affiliation(s)
- Yue Ji
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Minami Oka
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Satoshi Honda
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| |
Collapse
|