Experimental details are given for the previous preliminary reports concerning conversion of protoilludane (28) to hirsutene (3) and relatedreactions. Treatment of each of the bicyclic analogs 9, 10, 12 and 13 of the former compound afforded a hirsutene analog 8, through multiple 1,2-shift, together with other products. Treatment of a mixture of α- and β-protoilludene -epoxides (29α and 29β) with