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. 2019 Apr 18;7:263. doi: 10.3389/fchem.2019.00263

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Copyright © 2019 Eyckens and Henderson.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Scheme 4 — Synthesis of a non-C₂-symmetric bis-α-aminophosphonate 24 from p-phenylenediamine and incorporating different aldehydes in the SILs (Eyckens and Henderson, 2017).