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. 2019 Oct 17;24(20):3746. doi: 10.3390/molecules24203746

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© 2019 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/).

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Scheme 21 — Synthesis of the acrolein (a) and tartrate (b) based flame retardant diethyl 6,6′-(1-hydroxypropane-1,3-diyl)bis(dibenzo[c,e][1,2]oxaphosphinine 6-oxide) (ABD) and 2,3 didopyloxy-butanedicarboxylate (DT-DOPO).