Phosphaalkenes R¹C(O)–P=C(NMe₂)₂ (R¹=Ph, 4‐EtC₆H₄): Versatile Reagents for 1,3‐Dipolar Cycloadditions to Phosphenium Complexes [Cp(CO)₂M = PPh₂] (M = Mo, W)

Phospha‐ and Arsaalkenes RE=C(NMe2)2 (E = P, As) as Novel Phosphinidene‐ and Arsinidene‐Transfer Reagents

“…Phospheniumcomplexes[Cp(CO) 2 phanyl complexes 129a,b,d, 130, 131, and 133 were generated and isolated as crystalline compounds after column chromatography in 24-30 % yield [69] (Scheme 53). The reaction of 126a,b was also conducted with an excess of carbonyl-stabilized phosphaalkenes arylC(O)P=C-(NMe 2 ) 2 (134: aryl = Ph; 135: aryl = 4-EtC 6 H 4 ) in toluene in the range -30°C to room temperature to afford metallophosphaalkenes 136a,b and 137a,b in modest yields (30-46 %) [70] (Scheme 54).…”