AMBIDENTATE, ANIONIC PHOSPHINE-LIGANDS IN ORGANOELEMENT CHEMISTRY

Phosphinomethanides bind to electrophiles either via phosphorus or car bon. The resulting compounds usually are fluctional and/or may rearran ge from carbon to phosphorus coordination or vice versa. Selective oxi dative coupling reactions of the phosphinomethanide ligands are found with metal centers in high oxidation states, whereas these ligands are stable to reduction. Thus, low valent species can be stabilized. In a ddition, diphosphinomethanides are useful ligands to promote high coor dination numbers with main group (''hypervalent compounds''), transiti on or lanthanoide elements.