✍ Scribed by Jacek E. Nycz; Robert Musiol
No coin nor oath required. For personal study only.
An anion >P–O^−^ has been applied as an efficient synthetic precursor of four coordination compounds of the R~2~P(O)–(O)PR~2~ type, namely diphosphine dioxides (R = alkyl, aryl) as well as hypophosphoric acid esters (R = alkoxy, aryloxy), in a one‐pot reaction. Furthermore, there were elaborated some mechanistic aspects of the origin of the >P(O)–O–(O)P< anhydride, as a side‐product of the reaction between the anion >P–O^−^ and >P(O)X (X = Cl, Br) electrophiles. Attention is focused on the synthesis of the >P(O)–(O)P< compounds. © 2006 Wiley Periodicals, Inc. Heteroatom Chem 17:310–316, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20208
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## Abstract Terephthalic Schiff bases react with hypophosphorous acid to form 1,4‐phenylene‐bis‐__N__‐alkyl‐aminomethanephosphonous acids in moderate yields. NMR studies demonstrated that—for several examples—this reaction led to the exclusive formation of only one diastereomeric form. NMR investig