Quinquevalent phosphorus acids

This chapter shows, as in previous years, the most important achievements of the 2015 year in the area organophosphorus compounds containing three P–O bonds (phosphates), two P–O and one P–C bonds (phosphonates) as well as one P–O and two P–C bonds (phosphinates) in addition to the phosphoryl group PO. Each of the main sections, as usual, has been divided in the same way, covering synthesis, reactions and biological aspects. In all three sections, there has been a good coverage of various subjects, like new reagents, new methods of synthesis, total and stereocontrolled syntheses, biological investigations. Achievements in synthesis and applications of chiral phosphoric acids, usually contained in a large subsection which was for the first time introduced in 2009, this year, due to a limited space, are comprehensively mentioned but not discussed in detail. In this year, the area devoted to phosphoric and phosphonic acids and their derivatives showed further, continuing progress and dominated traditionally over a small subsection of phosphinic acids and derivatives.