2021 – present

96. Inner-Bond-Cleavage Approach to Figure-Eight Macrocycles from Planar Aromatic Hydrocarbons
R. Yoshina, J. Hirano, E. Nishimoto, Y. Sakamoto, K. Tajima, S. Minabe, M. Uyanik, K. Ishihara, T. Ikai, E. Yashima, T. Omine, F. Ishiwari, A. Saeki, J. Kim, J. Oh, D. Kim, G. Liu, T. Yasuda, H. Shinokubo, and N. Fukui
J. Am. Chem. Soc. 2024 DOI: 10.1021/jacs.4c07985. (Open Access)

95. Circularly Polarized Luminescence Chirality Inversion and Dual Anticounterfeiting Labels Based on Fluorescent Cholesteric Liquid Crystal Particles
J. He, M. Hara, R. Ohnuki, S. Yoshioka, T. Ikai, and Y. Takeoka
ACS Appl. Mater. Interfaces, 16, 43991-44003 (2024) 
DOI: 10.1021/acsami.4c08331.

94. Helix-Sense-Selective Memory Polymerization of Biphenylylacetylenes Bearing Carboxy and Amino Groups in Water
S. Okuda, T. Ikai, H. Okutsu, M. Ando, M. Hattori, R. Ishidate, and E. Yashima
Angew. Chem., Int. Ed., 63, e202412752 (2024)
DOI: 10.1002/anie.202412752. (Open Access)

93. Chiral Luminophore Guided Self-Assembly of Achiral Block Copolymers for the Amplification of Circularly Polarized Luminescence
S.-W. Shao, P. Puneet, M.-C. Li, T. Ikai, E. Yashima, and R.-M. Ho
ACS Macro Lett., 13, 734-740 (2024)
DOI: 10.1021/acsmacrolett.4c00188.

92. Synthesis of Sterically Congested Double Helicene by Alkyne Cycloisomerization
J. Hirano, S. Miyoshi, E. Yashima, T. Ikai, H. Shinokubo, and N. Fukui
Chem. Commun.,60, 6035-6038 (2024)
DOI: 10.1039/d4cc01573h.

91. 2,2´-Tethered Binaphthyl-Embedded One-Handed Helical Ladder Polymers: Impact of the Tether Length on Helical Geometry and Chiroptical PropertyT. Ikai, N. Mishima, T. Matsumoto, S. Miyoshi, K. Oki, and E. Yashima
Angew. Chem., Int. Ed., 63, e202318712 (2024) DOI: 10.1002/anie.202318712. (Open Access)
Selected as VIP paper

90. Tandem Isomerization/α,β-Site-Selective and Enantioselective Addition Reactions of N-(3-Butynoyl)-3,5-dimethylpyrazole Induced by Chiral -Cu(II) Catalysts
W. Guo, M. Hori, Y. Ogura, K. Nishimura, K. Oki, T. Ikai, E. Yashima, and K. Ishihara
J. Am. Chem. Soc., 145, 27080-27088 (2023)
DOI: 10.1021/jacs.3c10820. (Open Access)

89. Secondary Structure Modulation of Triptycene-Based One-Handed Helical Ladder Polymers through π-Extension of Achiral Segments
T. Ikai, A. Tanaka, T. Shiotani, K. Oki, and E. Yashima
Org. Mater., 5, 184-190 (2023)
DOI: 10.1055/a-2208-4389. (Open Access)
Special Issue on “Soluble Graphene Nanoarchitectures“

88. Control of One-Handed Helicity in Polyacetylenes: Impact of an Extremely Small Amount of Chiral Substituents
T. Ikai, Y. Morita, T. Majima, S. Takeda, R. Ishidate, K. Oki, N. Suzuki, H. Ohtani, H. Aoi, K. Maeda, K. Okoshi, and E. Yashima
J. Am. Chem. Soc., 145, 24862-24876 (2023)
DOI: 10.1021/jacs.3c09308. (Open Access)

87. Optically-Pure Triptycene-Based Metallomacrocycles and Homochiral Self-Sorting Assisted by Ladder Formation
K. Oki, W. Zheng, E. Yashima, and T. Ikai
Chem. Commun., 59, 8989-8992 (2023),
DOI: 10.1039/D3CC02259E. (Open Access)

86. One-Handed Helical Polyacetylenes Bearing Axially-Chiral 2-Arylpyridyl-N-Oxide Units for Efficient Chromatographic Enantioseparation of Chiral Aromatic and Aliphatic Alcohols
T. Ikai, M. Ito, K. Oki, N. Suzuki, and Eiji Yashima
Angew. Chem., Int. Ed., 62, e202306252 (2023)
DOI: 10.1002/anie.202306252.
Selected as VIP paper

85. Remote Control of One-Handed Helicity in Polyacetylenes through Flexible Spacers in Water: Impact of the Spacer Length
T. Ikai, K. Nakamura, K. Mizumoto, K. Oki, and E. Yashima
Angew. Chem., Int. Ed., 62, e202301127 (2023)
DOI: 10.1002/anie.202301127.
Selected as VIP paper

84. Defect-Free Synthesis of a Fully -Conjugated Helical Ladder Polymer and Resolution into a Pair of Enantiomeric Helical Ladders
T. Ikai, S. Miyoshi, K. Oki, R. Saha, Y. Hijikata, and E. Yashima
Angew. Chem., Int. Ed., 62, e202301962 (2023)
DOI: 10.1002/anie.202301962.
Selected as VIP paper

83. Stereospecific Synthesis of Enantiopure [6]Helicene Containing a Seven-Membered Ring and [7]Helicene via Acid-Promoted Stepwise Alkyne Annulations of Doubly Axial-Chiral Precursors
T. Ikai, K. Oki, S. Yamakawa, and E. Yashima
Angew. Chem., Int. Ed., 62, e202217020 (2023)
DOI: 10.1002/anie.202301836. (Open Access)

82. One-Handed Helical Tubular Ladder Polymers for Chromatographic Enantioseparation
W. Zheng, K. Oki, R. Saha, Y. Hijikata, E. Yashima, and T. Ikai
Angew. Chem., Int. Ed., 62, e202218297 (2023)
DOI: 10.1002/anie.202218297. (Open Access)

81. Amplification of Macromolecular Helicity of Poly(biphenylylacetylene)s Composed of a Small Amount of Chiral [5]Helicene UnitsT. Ikai, S. Anzai, K. Oki, and E. Yashima
J. Polym. Sci. , 61, 912-919 (2023)
DOI: 10.1002/pol.20220658.
Special Issue in honor of the 65th birthday of Prof. Takuzo Aida

80. Chiral and Achiral Pendant-Bound Poly(biphenylylacetylene)s Bearing Amide and/or Carbamate Groups: One-Handed Helix Formations and Chiral Recognition Abilities
T. Ikai, S. Okuda, M. Aizawa, and E. Yashima
Macromolecules, 55, 7023-7031 (2022)
DOI: 10.1021/acs.macromol.2c01362

79. Catalytic One-Handed Helix Induction and Subsequent Static Memory of Poly(biphenylylacetylene)s Assisted by a Small Amount of Carboxy Groups Introduced at the Pendants
T. Ikai, S. Takeda, and E. Yashima
ACS Macro Lett., 11, 525-531 (2022)
DOI: 10.1021/acsmacrolett.2c00136 (Open Access)

78. Consecutively Fused Single-, Double-, and Triple-Expanded Helicenes
W. Zheng, T. Ikai, K. Oki, and E. Yashima
Natural Sci., 2, e20210047 (2022)
DOI: 10.1002/ntls.20210047 (Open Access)
Video abstract is available online: https://onlinelibrary.wiley.com/doi/10.1002/ntls.20210047

77. Supramolecular Helical Assemblies of Dirhodium(II) Paddlewheels with 1,4-Diazabicyclo[2.2.2]octane: A Remarkable Substituent Effect on the Helical Sense Preference and Amplification of the Helical Handedness Excess of Metallo-Supramolecular Helical Polymers
S. Okuda, N. Ousaka, T. Iwata, R. Ishida, A. Urushima, N. Suzuki, S. Nagano, T. Ikai, and E. Yashima
J. Am. Chem. Soc., 144, 2775-2792 (2022)
DOI: 10.1021/jacs.1c12652 (Open Access)

76. Macromolecular Helicity Induction and Static Helicity Memory of Poly(Biphenylylacetylene)s Bearing Aromatic Pendant Groups and Their Use as Chiral Stationary Phases for High-Performance Liquid Chromatography
T. Ikai, S. Okuda, and E. Yashima
Chirality, 34, 306-316 (2022)
DOI: 10.1002/chir.23399
Special Issue in honor of the 80th birthday of Prof. Yoshio Okamoto

75. Emergence of Highly Enantioselective Catalytic Activity in a Helical Polymer Mediated by Deracemization of Racemic Pendants
T. Ikai, M. Ando, M. Ito, R. Ishidate, N. Suzuki, K. Maeda, and E. Yashima
J. Am. Chem. Soc., 143, 12725-12735 (2021)
DOI: 10.1021/jacs.1c05620

74. Synthesis of Single-Handed Helical Spiro-Conjugated Ladder Polymers through Quantitative and Chemoselective Cyclizations
W. Zheng, T. Ikai, and E. Yashima
Angew. Chem., Int. Ed., 60, 11294-11299 (2021)
DOI: 10.1002/anie.202102885
Selected as VIP paper

73. Water-Mediated Reversible Control of Three-State Double-Stranded Titanium(IV) Helicates
N. Ousaka, M. Itakura, A. Nagasaka, M. Ito, T. Hattori, D. Taura, T. Ikai, and E. Yashima
J. Am. Chem. Soc., 143, 4346-4358 (2021)
DOI: 10.1021/jacs.0c13351

72. One-Step Simultaneous Synthesis of Circularly Polarized Luminescent Multiple Helicenes Using a Chrysene Framework
T. Ikai, S. Yamakawa, N. Suzuki, and E. Yashima
Chem. Asian J., 16, 769-774 (2021)
DOI: 10.1002/asia.202100035
Selected as Front Cover

71. Racemic Monomer-Based One-Handed Helical Polymer Recognizes Enantiomers through Auto-Evolution of Its Helical Handedness Excess
T. Ikai, T. Kurake, S. Okuda, K. Maeda, and E. Yashima
Angew. Chem., Int. Ed., 60, 4625-4632 (2021)
DOI: 10.1002/anie.202014946
Selected as VIP paper and Frontispiece

70. Chiral Amplification of Supramolecular Coassemblies of Chiral and Achiral Acylhydrazine-Functionalized Biphenyls and Their Copolymers
T. Ikai, S. Kawabata, S. Okuda, N. Ousaka, and E. Yashima
Polym. J., 53, 1475-1480 (2021)
DOI: 10.1038/s41428-021-00550-7

69. Cellulose Phenylcarbamate-Derived Hybrid Bead-Type Chiral Packing Materials for Efficient Chiral Recognition
G. Li, X. Dai, Y. Min, C. Yu, T. Ikai, L. Zhang, J. Shen, and Y. Okamoto
Cellulose, 28, 347-358 (2021)
DOI: 10.1007/s10570-020-03514-x