Solid-state Alder-ene reaction of 1-hexene under high pressure

Xu, J.*; Lang, P.*; Liang, S.*; Zhang, J.*; Fei, Y.*; Wang, Y.*; Gao, D.*; Hattori, Takanori; Abe, Jun*; Dong, X.*; et al.

Journal of Physical Chemistry Letters (Internet), 16(10), p.2445 - 2451, 2025/03

https://doi.org/10.1021/acs.jpclett.4c03696

The Alder-ene reaction is a chemical reaction between an alkene with an allylic hydrogen, and it provides an efficient method to construct the C-C bond. Traditionally, this reaction requires catalysts, high temperatures, or photocatalysis. In this study, we reported a high-pressure-induced solid-state Alder-ene reaction of 1-hexene at room temperature without a catalyst. 1-Hexene crystallizes at 4.3 GPa and polymerizes at 18 GPa, forming olefins. By exploring gas chromatography-mass spectrometry, we discovered that 1-hexene generates dimeric products through the Alder-ene reaction under high pressures. The in situ neutron diffraction shows that the reaction process did not obey the topochemical rule. A six-membered ring transition state including one C-H bond and two alkene bonds was evidenced by the theoretical calculation, whose energy obviously decreased when compressed to 20 GPa. Our work offers a novel and promising method to realize the Alder-ene reaction at room temperature without a catalyst, expanding the application of this important reaction.

Validation of the Be ground-state molecular structure using Be()He triple differential reaction cross-section measurements

Li, P. J.*; Beaumel, D.*; Lee, J.*; Assi, M.*; Chen, S.*; Franchoo, S.*; Gibelin, J.*; Hammache, F.*; Harada, T.*; Kanada-En'yo, Yoshiko*; et al.

Physical Review Letters, 131(21), p.212501_1 - 212501_7, 2023/11

https://doi.org/10.1103/PhysRevLett.131.212501

The cluster structure of the neutron-rich isotope Be has been probed via the () reaction. The triple differential cross-section was extracted and compared to distorted-wave impulse approximation reaction calculations performed in a microscopic framework using the Tohsaki-Horiuchi-Schuck-Rpke wave function and the wave function deduced from Antisymmetrized Molecular Dynamics calculations. The remarkable agreement between calculated and measured cross-sections in both shape and magnitude validates the description of the Be ground-state as a rather compact nuclear molecule.

Ten years of warming increased plant-derived carbon accumulation in an East Asian monsoon forest

Zhang, J.*; Kuang, L.*; Mou, Z.*; Kondo, Toshiaki*; Koarashi, Jun; Atarashi-Andoh, Mariko; Li, Y.*; Tang, X.*; Wang, Y.-P.*; Peuelas, J.*; et al.

Plant and Soil, 481(1-2), p.349 - 365, 2022/12

https://doi.org/10.1007/s11104-022-05642-8

Adsorption behavior of W and Mo as lighter homologues of seaborgium (Sg) in HF/HNO on anion-exchange resin

Liang, X. H.*; Tsukada, Kazuaki; Toyoshima, Atsushi; Li, Z.*; Asai, Masato; Sato, Tetsuya; Sato, Nozomi; Nagame, Yuichiro

Journal of Radioanalytical and Nuclear Chemistry, 292(2), p.917 - 922, 2012/05

https://doi.org/10.1007/s10967-012-1624-2

Adsorption of carrier-free radiotracers W and Mo produced in the Ta(, ) and Nb(, ) reactions, respectively, on anion-exchange resin was studied in mixed solution of HF and HNO in a concentration range of 10 - 10 M HF/0.1 M HNO. Distribution coefficients () of W and Mo at 70 C showed the V-shaped variation with the minimum at around 10 M HF/0.1 M HNO although variation of the values for Mo was quite small compared with that for W. Formation of oxofluoro complexes for W and Mo is briefly discussed.

PET studies of neuroendcrine tumors by using Br--bromobenzylguanidine (Br-MBBG)

Watanabe, Shigeki; Hanaoka, Hirofumi*; Liang, J. X.*; Iida, Yasuhiko*; Watanabe, Satoshi; Endo, Keigo*; Ishioka, Noriko

JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 107, 2011/01

https://jopss.jaea.go.jp/pdfdata/JAEA-Review-2010-065.pdf

Br-m-bromobenzylguanidine (Br-MBBG) for in vivo imaging of neuroendcrine-tumor with PET

Watanabe, Shigeki; Hanaoka, Hirofumi*; Liang, J. X.; Iida, Yasuhiko*; Watanabe, Satoshi; Endo, Keigo*; Ishioka, Noriko

JAEA-Review 2009-041, JAEA Takasaki Annual Report 2008, P. 107, 2009/12

https://jopss.jaea.go.jp/pdfdata/JAEA-Review-2009-041.pdf

Synthesis of Br-76 labeled MBBG for tumor imaging with PET

Watanabe, Shigeki; Hanaoka, Hirofumi*; Liang, J. X.; Iida, Yasuhiko*; Watanabe, Satoshi; Endo, Keigo*; Ishioka, Noriko

no journal, , 

no abstracts in English

Development of novel PET radiopharmaceutical Br-MBBG and application to tumor imaging

Watanabe, Shigeki; Hanaoka, Hirofumi*; Liang, J. X.; Iida, Yasuhiko*; Watanabe, Satoshi; Endo, Keigo*; Ishioka, Noriko

no journal, , 

no abstracts in English

Cation-exchange behavior of element 104, Rf, in HSO/HNO mixed solution ([H] = 1.0 M)

Li, Z.; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Schdel, M.*; Nagame, Yuichiro; Liang, X. H.*; Kasamatsu, Yoshitaka*; et al.

no journal, , 

Cation-exchange behavior of Rf (T = 78 s) produced in the Cm(O,5n) reaction was studied on a "one-atom-at-a-time" scale in 0.15-0.69 M HSO/HNO mixed solutions ([H] = 1.0 M) using an automated ion-exchange separation apparatus coupled with a detection system for alpha-spectroscopy (AIDA). It was found that adsorption probabilities (%ads) of Rf on the cation-exchange resin decrease with increasing [HSO], showing successive formation of Rf sulfate complexes. Rf exhibits a weaker complex formation than the lighter homologues Zr and Hf.

Long-term warming effect on soil carbon fluxes in a red pine forest in Tsukuba

Teramoto, Munemasa*; Liang, N.*; Jiye, Z.*; Koarashi, Jun; Kondo, Toshiaki*; Atarashi-Andoh, Mariko; Aramaki, Takafumi*; Zhao, X.*

no journal, , 

Forest soils are a large source for CO and sink for CH. Understanding long-term response of these soil carbon fluxes to warmer environment is the key to mitigation and adaptation for future climate change. To examine the long-term response of CO flux to global warming in Asian monsoon forests, we set multi-channel automated chamber measurement system in a red pine forest in Tsukuba. Half of the chambers were artificially warmed by infrared heaters. Recently, we started continuous measurement of soil CH flux using a control unit with CH analyzer. Results showed that soil temperature is the primary factor controlling soil CO fluxes, whereas soil moisture is the main factor controlling soil CH uptake in our study site.