oa Editorial [Hot topic: Organophosphorus (Guest Editor: Gyorgy Keglevich)]

These days the organophosphorus discipline is in focus within organic chemistry. After the success of Organophosphorus (OP) special issues 1-7 of Current Organic Chemistry, the 8th OP special issue is announced here showing up mainly green and synthetic aspects. Two articles illustrate the advantages of applying ionic liquids instead of traditional solvents. In the first of these, efficient organophosphorus syntheses that were carried out in ionic liquids, or in some cases in water, have been collected. In the second, typical homogeneous catalytic reactions involving hydrogen, carbon monoxide or carbon dioxide as the reagents are described to illustrate the activating ability of ionic liquids. The third paper presents alkenylphosphines as versatile intermediates. They can be involved in nucleophilic addition, or cycloaddition or polymerization reactions, or may be the building blocks of bidentate ligands or dendrimers. Finally, prototropic isomerizations within the C=N-CH triad of imidoylphosphonates are discussed.