Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Akina Yoshizawa Last modified date:2023.10.03

Assistant Professor / 触媒有機化学研究室 / Department of Chemistry / Faculty of Sciences

1. Daisuke Hirose, Samuel Budi Wardhana Kusuma, Akina Yoshizawa, Naoki Wada, Kenji Takahashi, Dehydrogenative silylation of cellulose in ionic liquid, Green Chemistry, 10.1039/D3GC02894A, 25, 7062-7067, 2023.08, A new homogenous silylation method of cellulose is developed by mixing it with monohydrosilane in an ionic liquid..
2. Abdessamad Arbaoui, Carl Redshaw, Mark R. J. Elsegood, Victoria E. Wright, Akina Yoshizawa, Takehiko Yamato, Iron(III) and Zinc(II) calixarene complexes: Synthesis, structural studies, and use as procatalysts for ε-caprolactone polymerization, Chemistry - An Asian Journal, 10.1002/asia.200900514, 5, 3, 621-633, 2010.03, Treatment of the heterobimetallic iron(II) alkoxides [(THF)MFe(OtBu) 3]2 with p-tert-butylcalix[4]areneH4 (L 1H4) affords the oxo-bridged diiron(III) complexes {Fe[M(NCMe)x]2L1}2(μ-O), M=Na, x=2 1·8(CH3CN), M=K, x=3 2·3.5(CH3CN)
similar use of p-tert-butylcalix[6]areneH6 (L2H 6) afforded [{Fe2(μ-O)Na2(OH 2)(NCMe)2L2}2][{Fe 2(μ-O)Na(OH2)(NCMe)6L2} 2]2-[Na(NCMe)5]22+ 3·9.46(CH3CN) and [{Fe2(μ-O)L 2(K(NCMe)2)2}2] 4·10.8(MeCN), respectively. In the case of 4, a minor product {(L2 2Fe8O8)[K(NCMe)1.5K(H 2O)(NCMe)2.5]2} 5·6(CH3CN), which is comprised of chains of (L22Fe8O 8) clusters bridged by K/MeCN fragments, is also isolated. Use of p-tert-butylcalix[8]areneH8 (L3H8) and two equivalents of [(THF)KFe(OtBu)3]2 affords [(K 2(μ-NCCH3)4(μ-OH2)) 2(Fe2(μ-O)L3H2) 2(CH3CN)2] 6·9(CH3CN). In the case of p-tert-butyltetrahomodioxacalix[6]areneH6 (L 4H6), reaction with [(THF)MFe(OtBu)3] 2 (two equivalents) leads to isolation of the pseudoisomorphic complexes [M2(CH3CN)4L4Fe 2(μ-O)].4CH3CN M=Na 7·4(CH3CN), M=K 8·2(CH3CN)
similar use of p-tert-butylhexahomotrioxacalix[3] areneH3 (L5H3) led to [Na2Fe 2(μ-OH)2(L5)2(CH 3CN)4] 9·2(CH2Cl2). The complex [L4(ZnEt)4Zn2(CH3CN) 4(μ-OEt)2], 10·2(CH3CN), isolated from the reaction of L4H6 and ZnEt2 is also reported. Complexes 1-10 are structurally characterized (partially in the case of 4) and screened (not 5) as catalysts for the ring opening polymerization of ε-caprolactone. © 2010 Wiley-VCH Verlag GmbH&amp
Co. KGaA..
3. Takehiko Yamato, Carol Pérez-Casas, Akina Yoshizawa, Shofuir Rahman, Mark R. J. Elsegood, Carl Redshaw, Hydrogen bonding receptors of tetraamide derivatives derived from thiacalix[4]arene in cone- and 1,3-alternate conformation, Journal of Inclusion Phenomena and Macrocyclic Chemistry, 10.1007/s10847-008-9523-4, 63, 3-4, 301-308, 2009.04, Novel ditopic receptors of tetraamide derivatives possessing four 2-pyridyl groups derived from thiacalix[4]arene in cone- and 1,3-alternate conformation were prepared. The structure of one of the tetraamide derivatives was confirmed by a single crystal X-ray analysis. The tetrathiacalix[4]arene tetraamides show strong intramolecular hydrogen bonding. The binding behaviour towards Ag + and halides has been investigated by 1H NMR titration experiments. © 2008 Springer Science+Business Media B.V..