N. Vicart et Rj. Whitby, Synthesis of carbocycles by insertion of 1,1-dihalo-1-lithio species into zirconacycles, CHEM COMMUN, (13), 1999, pp. 1241-1242
1,1-Dihalo-1-lithio species (halogenocarbenoids) undergo double insertion i
nto the carbon-zirconium bonds of a zirconacyclopent-ane or -ene to produce
, after hydrolysis, bicyclo[3.3.0]oct-anes and -enes.