<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Propargyl xanthates undergo rearrangement to afford intermediary bis(alkylidene)dithiolanones which are trapped by Diels‐Alder cycloaddition to yield dithiolones, representing three new carbocycle types such as (II), (VIII), and (X).</p> </abstract>