Unsaturated Four-Membered Phosphorus-Carbon Rings: From Organic to Coordination Chemistry

Abstract

The chemistry of 1,2-dihydrophosphetes and 1,2-dihydro-1,2-diphosphetes is comprehensively reviewed. Several applications such as the synthesis of tetraphosphafulvalenes and 1,3-diphospholyl anions are mentioned. The interconversion with open-chain 1-phospha- and 1,4-diphosphadienes is emphasized. The various coordination modes are discussed.

Key Words:

• phosphorus-carbon heterocycles
• 1,2-dihydrophosphetes
• 1,2-dihydro-1,2-diphosphetes
• 1-phosphadienes
• 1,4-diphosphadienes
• 1,3-diphospholyl anions
• tetruphosphafulvalenes
• insertion reactions
• electrocyclisations