Hypercoordinate PII, PIII, and PIV Phosphorus Derivatives with Intramolecular Coordination by Donor Groups

This review describes phosphanes and phosphane derivatives as well as phosphenium salts in which increase in coordination number was achieved by intramolecular coordination of donor groups. This effect was established by X-ray crystal structure analysis and was also inferred from 1H-NMR studies in solution. Where possible, comparison with the corresponding silicon compounds was made.