1. For selected examples see: a) A. Hoffmann-Röder, N. Krause. Angew. Chem. Int. Ed., 2004, 43, 1196–1216. b) M. Ogasawara, T. Nagano, T. Hayashi. J. Org. Chem., 2005, 70, 5764–5767. For textbooks see: N. Krause, A. Hoffmann-Röder. In Modern Allene Chemistry, N. Krause and A. S. K. Hashmi, Eds. WILEY‐VCH, Weinheim, 2004; pp 997-1040.
2. For selected examples: a) J. Ye, S. Ma. Acc. Chem. Res., 2014, 47, 989–1000. b) R. K. Shukla, A. M. Nair, C. M. R. Volla. Synlett, 2021, 32, 1169-1178. c) V. Cardieno. Catalysts, 2020, 10, 1206-1242. For textbooks see: K. M. Brummond, H. Chen In Modern Allene Chemistry, N. Krause and A. S. K. Hashmi, Eds. WILEY‐VCH,Weinheim, 2004; pp 1041-1089.
3. For selected examples: a) N. Cabrera-Lobera, N. Velasco, R. Sanz, M. A. Fernández-Rodríguez. Tetrahedron, 2019, 75, 4071–4080. b) H. Wang, H. Luo, Z. M. Zhang, W. F. Zheng, Y. Yin, H. Qian, J. Zhang, S. Ma. J. Am. Chem. Soc., 2020, 142, 9763–9771. c) F. Li, S. Liang, Y. Luan, X. Chen, H. Zhao, A. Huang, P. Li, W. Li. Org. Chem. Front., 2021, 8, 1243-1248. d) Z. Wang, X. Lin, X. Chen, P. Li, W. Li. Org. Chem. Front., 2021, 8, 3469-3474.
4. For selected examples: a) Z. Zhang, X. Shao, G. Zhang, Q. Li, X. Li. Synthesis, 2017, 49, 3643–3653. b) Z. Zhang, S. Mo, G. Zhang, X. Shao, Q. Li, Y. Zhong. Synlett, 2017, 28, 611–614. c) I. Scheipers, C. Mück-Lichtenfeld, A. Studer. Angew. Chem. Int. Ed., 2019, 58, 6545-6548.
5. For selected examples: a) K. F. Zhang, K. J. Bian, C. Li, J. Sheng, Y. Li, X. S. Wang. Angew. Chem., Int. Ed., 2019, 58, 5069–5074. b) X. B. Shao, Z. Zhang, Q. H. Li, Z. G. Zhao. Org. Biomol. Chem., 2018, 16, 4797–4806.