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. 2023 Mar 20;12(3):619. doi: 10.3390/antibiotics12030619

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — Top and bottom respectively: general synthetic procedures and chemical structures of 4,5-pinene and 5,6-pinene bipyridine ligands (L#) and of Re complexes. For ligand synthesis, conditions are: (a) stepwise 1. EtOH/AcOH NH₄OAc; 2. NaNO₂, HBr, 0°; 3. CuBr, HBr, 70°; 4. Zn/[Ni(PPh₃)₄Cl₂], DMF [55]. (b) NH₄OAc/AcOH, 100° [47].