Approach to the synthesis of five-membered organophosphorus compounds through alumoles and alumolanes

This work summarizes the results of a new approach to the synthesis of previously undescribed, hard-to-obtained five-membered cyclic organophosphorus compounds - 3-alkyl(aryl)-substituted phospholanes, α,ω-bisphospholanes, polycyclic phospholanes, 4,5-dialkyl(diaryl)-disubstituted 2,3-dihydrophospholes, as well as their oxides and sulfides. Alumolеs and alumolanes synthesized by the reaction of cycloalumination of available unsaturated compounds (terminal alkenes, α,ω-alkadienes, norbornene derivatives, symmetrical internal alkynes) with Et₃Al in the presence of a Cp₂ZrCl₂ catalyst were used as precursors. The substitution of aluminum atoms in cyclic organoaluminum compounds for phosphorus atoms takes place using alkyl(aryl)phosphorus (III) dichlorides. The developed one-pot method of gives the products in high yields under mild conditions.