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. 2020 Nov 23;25(22):5484. doi: 10.3390/molecules25225484

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Scheme 1 — Structures of phosphine ^a and KHB(pz)₃ ligands used in this work. ^a PTA = 1,3,5-triaza-7-phosphaadamantane; DAPTA = 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo [3.3.1]nonane; PTA-SO₂ = 2-thia-1,3,5-triaza-phosphaadamantane 2,2-dioxide; PCN = tris(cyanoethyl)phosphine; PPh₃ = triphenylphosphine.