Metallated oxiranes are widely used as nucleophiles, and as sources of carbenes, but their use as carbenoids is much less studied. 1 The term 'carbenoid' was initially used for 1-halo-1-metallo (usually lithio) species. 2 The ring-strain present in metallated oxiranes renders the alkoxide a sufficiently good leaving group that carbenoid properties may be observed. 1 We are interested in the insertion of carbenoids into carbon–metal bonds to afford new organometallic ...