Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Free radical promoted ring-expansion of nitrogen-, oxygen- and sulfur-containing heterocyclic β-keto esters is described. Treatment of the derived phenylselenomethyl derivatives with tri-n-butyltin hydride leasds to smooth one-carbon ring expansion.
