Synthesis of Functionalized Tris(2-propoxyphenyl)phosphine Oxides as Precursors of Tripodal Propeller-Shaped Ligands

Abstract

A series of precursors of novel tripodal ligands (2-XCH2CH2CH2OC6H4)3PO, where X = AcO, HO, MeSO2O, Br, N3, were synthesized by the alkylation of the starting tris(2-hydroxyphenyl)phosphine oxide with 3-bromopropyl acetate followed by hydrolysis of the resulting triacetate to triol and conversion of the latter to trimesylate. Treratment of the resulting trimesylate with LiBr or NaN3 was used to prepare the corresponding tribromo or triazido derivatives.