Effects of diminished steric protection at phosphorus on stability and reactivity of oxaphosphirane complexes

Facile synthesis of oxaphosphirane complexes II, 1,3,2-dioxaphosphol-4-ene III and 1,3,2-dioxaphospholane complexes IV from Li/Cl phosphinidenoid complexes I is described.

Study on the Acid-Induced Ring-Expansion of an Oxaphosphirane Complex with an Electron-Withdrawing C-Substituent

A study on the acid-induced ring-expansion reaction of the first oxaphosphirane complexes bearing an electron-withdrawing C-substituent is described. The stereoselectively obtained 1,3,4-dioxaphospholane complexes 4a–c, representing the first examples of such fluorinated ligands, were unambiguously characterized by multinuclear NMR, elemental analysis, mass spectrometry, and single-crystal X-ray diffraction studies.

A novel route to C-unsubstituted 1,2-oxaphosphetane and 1,2-oxaphospholane complexes

The synthesis of 1,2-oxaphosphetane complexes 7 and 1,2-oxaphospholane complex 12 bearing only substituents at phosphorus is reported using the reaction of Li/Cl phosphinidenoid complex 2 with 2-iodoethanol or 3-bromo-propane-1-ol and the subsequent dehydrohalogenation using KHMDS.

Rearrangement and deoxygenation of 3,3-bis(2-pyridyl)oxaphosphirane complexes

The reaction of Li/Cl phosphinidenoid pentacarbonylmetal(0) complexes with bis(2-pyridyl)ketone led to overcrowded oxaphosphirane derivatives. They can undergo deoxygenation by Ti(iii) reagents or ring expansion via P–C cleavage followed by P–N cyclization.

Activation of A–H bonds (A = B, C, N, O, Si) by using monovalent phosphorus complexes [RP→M]

The insertion of electrophilic terminal phosphinidene complexes [RP–M] into A–H bonds (A = B, C, N, O, Si) has been reviewed and some new mechanistic proposals have been made.