Rigorous peer reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Reactions was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 19 days, and the median time to publication was 47 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| A. J. Romero-Anaya | Martyna Dymek |
| Aitor Arregi | Miguel Menéndez |
| Alberto Marra | Miriam Gonzalez Castano |
| Alessandro Di Michele | Mohammad Taherzadeh |
| Alexander Hansen Bork | Mohammadreza Shokouhimehr |
| Alexey V. Ivanov | Morris Argyle |
| Ana María Díez-Pascual | Muhammad Arshad |
| Anand Chokkalingam | Nebojsa Marinkovic |
| Andrey Khalimon | Niclas Solin |
| Antonio Valverde-González | Omid Akhavan |
| Dong-Pyo Kim | Paolo Defilippis |
| Emilio Muñoz-Sandoval | Pierre Vogel |
| Enrique Aguilar | Ranjith Thangavel |
| Esmail Doustkhah | Robert C. Bowman |
| Gianvito Vilé | Sandie Dann |
| Hendrik Kosslick | Sebastiano Campisi |
| Hugo de Lasa | Sergei Chernyak |
| Ismael Matino | Seung Wook Kim |
| Jae-hyeok Shim | Sónia Carabineiro |
| Jiahan Xie | Sukeun Yoon |
| Joana Alves | Thuat Trinh |
| József S. Pap | Tiago A. Fernandes |
| Kamila Sadowska | Tomasz Czujko |
| Ken Sakata | Vassilios Dracopoulos |
| Kollarigowda Ravichandran | Vega Lloveras |
| M. R. M. Asyraf | Wanda Ziemkowska |
| Maria Elena Russo | Xiaochen Shen |
| Maria Magomedova |
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