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. ... In connection with periplanone A, acid-catalyzed reaction of germacrene-D epoxide has been carried out using AlCl 3 in ether to afford a hydroazulene which has been further transformed into one of the hydroazulenones proposed to be periplanone A. ... Synthesis of tricyclic ...