Editorial [Hot Topic: Special Issue on Organophosphorus Chemistry (Guest Editor: György Keglevich)]

After the success of the 1st Organophosphorus (OP) special issue of Current Organic Chemistry consisting of two parts published back to back it is my pleasure to announce the 2nd. OP special issue approved by the Editor-in-Chief, Professor Attaur- Rahman and the management of Bentham. The first three papers cover relatively large molecules, such as phosphorus-containing cyclodextrins, calixarenes and cyclophanes, as well as dendrimers. The phosphorus-containing macrocycles form an important group due to supramolecular host-guest interactions allowing enantioselective syntheses based on chiral discrimination and making possible selective extractions and application as sensors. Phosphorus containing dendrimers represent a marvellous field involving the features of art and a real architecture. The next article is on the fragmentation and rearrangements of -hydroxyiminoalkylphosphonates. The generation of metaphosphates is important from the synthetic point of view as the low-coordinate P-species are efficient phosphorylating agents; nevertheless the mechanism for the fragmentation is also of interest. The rich chemistry of N-vinylic phosphazenes is reflected in the next contribution, as they can be excellent building blocks in the synthesis of a variety of acyclic and heterocyclic compounds. The issue of stereogenic phosphorus remains an evergreen topic from the point of view of chirality, especially if it is discussed in a broader context including tricoordinated-, tetracoordinated-, pentacoordinated- and hexacoordinated phosphorus. Two papers cover the chemistry of sterically congested phosphorus compounds, such as tert-butyl substituted phosphinic- and phosphinous acid derivatives, as well as crowded triarylphosphines. The presence of bulky P-substituents is important from stability and mechanistic points of view, but may bring about advantages connected with the physical properties of the substrate. The next three articles fall in the scope of P-heterocyclic chemistry, but from entirely different approaches. Recent developments of the family of azaphospholes, that can be regarded as a modification of the most common P-heterocycles, phospholes, are discussed. Then an up-to-date method for the synthesis of P-ligands applying zirconium reagents is shown and this is followed by the presentation of chiral heterocyclic phosphines together with asymmetric catalytic applications. Finally, the phosphorus aspects of green chemistry have been surveyed. The use of quaternary phosphonium salts and 1,3- dialkylimidazolium hexafluorophosphates are summarized including the major synthetic applications. The 1. Organophosphorus Special Issue has been divided into two parts published back to back. The six reviews included in this issue (Part II) have been preceded by six other articles in Volume 10, Number 18 (Part I). The previous papers are the following: Organophosphorus Supramolecular Chemistry; Part 1. Receptors for Organophosphorus Compounds by ukasz Berlicki, Ewa Rudzi ska, Piotr M ynarz and Pawe Kafarski Phosphorus-Containing Chiral Macrocycles by Sergey Cherenok, Jean-Pierre Dutasta and Vitaly Kalchenko Synthetic Pathways towards Phosphorus Dendrimers and Dendritic Architectures by Anne-Marie Caminade, Cedric-Olivier Turrin, Regis Laurent, Alexandrine Maraval and Jean-Pierre Majoral Fragmentations and Rearrangements of α-Hydroxyiminoalkylphosphonates by Eli Breuer N-Vinylic Phosphazenes. A Useful Tool for the Synthesis of Acyclic and Heterocyclic Compounds by FranciscoPalacios, Domitila Aparicio, Gloria Rubiales, Concepción Alonso and Jesus M. de los Santos Stereogenic Phosphorus by Robert Engel and JaimeLee I'olani Rizzo