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https://doi.org/10.1038/s41467-023-40188-y

Acknowledgements

This work was supported by JSPS KAKENHI Grant Numbers JP19H05635

(N.T. and Y.M.), JP20K20447 (N.T.), JP19H05528 (N.T.), JP18H01963

(Y.M.), and JP16H04110 (N.T.) and Integrated Research Consortium on

Chemical Science (IRCCS). Y.M. gratefully acknowledges ISHIZUE 2022

of Kyoto University. This study was supported by the Joint Usage/

Research Center [JURC, Institute for Chemical Research (ICR), Kyoto

University] by providing access to a Bruker Avance III 600 NMR spectrometer. We are furthermore grateful for the computation time, which

was provided by the Super Computer Laboratory (ICR, Kyoto University).

Elemental analyses were carried out at the Microanalytical Laboratory of

the ICR (Kyoto University). The authors thank Prof. Masahiro Yamanaka

(Rikkyo Univ.) for the helpful discussion about computational studies.

Preliminary X-ray diffraction data of 5-2 and 6·NHC were collected at the

BL02B1 beamline of SPring-8 (JASRI, 2022A1621 and 2022A1200).

Author contributions

Y.M., R.N., and N.T. determined the research strategy, and R.N. and R.S.

performed the synthetic experiments. R.N. collected the physical

properties and spectral data of all compounds appearing in this paper.

R.N. and Y.M. performed the X-ray crystallographic analyses and theoretical calculations. Y.M., N.T., and R.W. supervised the work. All authors

co-wrote the paper.

Competing interests

The authors declare no competing interests.

Additional information

Supplementary information The online version contains

supplementary material available at

https://doi.org/10.1038/s41467-023-40188-y.

Correspondence and requests for materials should be addressed to

Norihiro Tokitoh or Yoshiyuki Mizuhata.

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