Journal of the American Chemical Society, Vol.127, No.22, 8024-8025, 2005
1,1-Cycloaddition of oxalyl dichloride with dialkenylmetal compounds: Formation of cyclopentadienone derivatives by the reaction of 1,4,-dilithio-1,3-dienes or zirconacyclopentadienes with oxalyl chloride in the presence of CuCl