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Shi Z, Wang J, Teraguchi M, Aoki T, Kaneko T. Helix-Sense-Selective Polymerization of 3,5-bis(hydroxymethyl)phenylacetylene Rigidly Bearing Galvinoxyl Residues and Their Chiroptical Properties. Polymers (Basel) 2019; 11:E1877. [PMID: 31766269 PMCID: PMC6918253 DOI: 10.3390/polym11111877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 11/06/2019] [Accepted: 11/11/2019] [Indexed: 11/16/2022] Open
Abstract
Four kinds of newly synthesized achiral phenylacetylenes bearing a phenylhydrogalvinoxyl residue at 4-position were polymerized by using a chiral rhodium catalyst system, [Rh(nbd)B(C6H5)4] or [Rh(nbd)Cl]2 catalysts in the presence of chiral (R)-(+)- or (S)-(-)-1-phenylethylamine ((R)- or (S)-PEA) cocatalysts. Poly(m-HGDHPA) and poly(m-HGTHPA) in THF showed Cotton signals at the absorption regions of the main chain and hydrogalvinoxyl in the circular dichroism (CD) spectra. It indicated that excess of one-handed helical polyacetylene backbone was induced by helix-sense-selective polymerization (HSSP) under the asymmetric conditions despite the achiral monomer, and the hydrogalvinoxyl moieties were also arranged to form one-handed helical structure. However, there was no Cotton effect for poly(p-HGDHPA) and poly(p-HGTHPA) because the intramolecular hydrogen bonding did not act well to stabilize the helical conformation. The hydrogalvinoxyl units of poly(m-HGDHPA) and poly(m-HGTHPA) were converted to the corresponding galvinoxyl radicals after treatment with PbO2. In the CD spectra of the polyradicals, the Cotton effects decreased depending on their static stability of helical conformation, suggesting that reversal conformation of the polymer chain arose.
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Affiliation(s)
- Zhichun Shi
- College of Chemistry and Chemical Engineering, Qiqihar University, Wenhua Street 42, Qiqihar 161006, Heilongjiang, China
| | - Jianjun Wang
- College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar 161006, Heilongjiang, China;
| | - Masahiro Teraguchi
- Department of Chemistry and Chemical Engineering, Niigata University, Ikarashi 2-8050, Nishi-ku, Niigata 950-2181, Japan; (M.T.); (T.A.)
- Graduate School of Science and Technology, Niigata University, Ikarashi 2-8050, Nishi-ku, Niigata 950-2181, Japan
| | - Toshiki Aoki
- Department of Chemistry and Chemical Engineering, Niigata University, Ikarashi 2-8050, Nishi-ku, Niigata 950-2181, Japan; (M.T.); (T.A.)
- Graduate School of Science and Technology, Niigata University, Ikarashi 2-8050, Nishi-ku, Niigata 950-2181, Japan
- College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar 161006, Heilongjiang, China;
| | - Takashi Kaneko
- Department of Chemistry and Chemical Engineering, Niigata University, Ikarashi 2-8050, Nishi-ku, Niigata 950-2181, Japan; (M.T.); (T.A.)
- Graduate School of Science and Technology, Niigata University, Ikarashi 2-8050, Nishi-ku, Niigata 950-2181, Japan
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Jayram J, Xulu BA, Jeena V. Iodine/DMSO promoted oxidation of benzylic Csp3–H bonds to diketones – A mechanistic investigation. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130617] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Dol C, Gerbaud G, Guigliarelli B, Bloch E, Gastaldi S, Besson E. Modulating lifetimes and relaxation times of phenoxyl radicals through their incorporation into different hybrid nanostructures. Phys Chem Chem Phys 2019; 21:16337-16344. [DOI: 10.1039/c9cp03052b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Playing with the structural features of various hybrid materials enables to adjust physical properties of phenoxyl radicals.
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Affiliation(s)
| | | | | | - Emily Bloch
- Aix Marseille Univ
- CNRS
- MADIREL
- Marseille
- France
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Dol C, Vibert F, Bertrand MP, Lalevée J, Gastaldi S, Besson E. Diazene-Functionalized Lamellar Materials as Nanobuilding Blocks: Application as Light-Sensitive Fillers to Initiate Radical Photopolymerizations. ACS Macro Lett 2017; 6:117-120. [PMID: 35632879 DOI: 10.1021/acsmacrolett.6b00949] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
New polysilsesquioxane-based lamellar materials, functionalized with radical precursors, were synthesized. They play a double role in the preparation of composite materials: first, as filler homogeneously dispersed in the monomer after delamination, second as radical initiator in photopolymerization. These polysilsesquioxanes enable fast and efficient photopolymerization upon UV light for thick samples. High conversions in monomers as well as the formation of hybrid polymers covalently linked to the filler are observed. This strategy, based on a double bottom-up approach, avoids the solubility/dispersion problem encountered in the classical preparation of composite polymers from preformed organic polymers.
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Affiliation(s)
- Cyrielle Dol
- Aix Marseille Univ, CNRS,
ICR, Marseille, France
| | | | | | - Jacques Lalevée
- Institut
de Science
des Matériaux de Mulhouse IS2M − UMR CNRS 7361 −
UHA, 15, rue Jean Starcky, 68057 Mulhouse Cedex, France
| | | | - Eric Besson
- Aix Marseille Univ, CNRS,
ICR, Marseille, France
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Solid state generation of phenoxyl radicals through β-fragmentation from specifically designed diazenes. An ESR investigation. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.02.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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