Abstract
Phosphiranes with a three-membered PC2 ring have unique electronic properties.[1] Although their ring strain is smaller than that in cyclopropanes, they are highly reactive and display remarkable chemistry, such as [2+1] cycloreversions to olefins and phosphinidenes [R P],[2] cationic ring-opening polymerization to poly(ethylenephosphine),[3] and special properties as ligands in transition-metal
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