Abstract: Cyclizations of the dianion of 1,1-diphenylacetone allows for the synthesis of various heterocycles. From a study directed towards the regioselectivity of such reactions a new allene synthesis via allene dianions was found by serendipity. Reactions of allene dianions with various electrophiles were studied.

Review: Synlett 2023, 34, 414–422.

Period of investigation: 1993 - 2003

Keywords: allenes; cyclizations; dianions