[2 + 2] Cycloadditions between electron-poor phospha-alkene complexes and electron-rich alkenes or alkynes, a new route to phosphetane and 1,2-dihydrophosphete rings
Abstract
Ethoxycarbonyl-C-substituted phospha-alkene P-W(CO)5 complexes instantly react at low temperature with enamines, enol ethers, ynamines, and ethoxyacetylene to yield the corresponding phosphetane and 1,2-dihydrophosphete [2 + 2] cycloadducts.