Abstract: Treatment of I-diazo-2, s-pentanediones with rhodium (I1) carboxylates affords cyclic six-ring carbonyl ylide dipoles. These species undergo facile 1, 3-dipolar cycloaddition with both electron-deficient and electron-rich dipolarophiles. In certain cases 2: l cycloadducts are formed. The higher order cycloadducts are derived by further dipolar cycloaddition of the carbonyl ylide across the keto group of the initially formed 1: l ...
