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Reaction of thiofenchone with disulfur dichloride gave trisulfane (15%) and tricyclic tetrasulfane (50%), all of which were Wagner-Meerwein rearranged products. Thiocamphor also reacted with disulfur dichloride to afford six-and seven-membered tricyclic polysulfanes. Selenofenchone also reacted with diselenium dibromide to afford diselenane and triselenane, both of which were Wagner-Meerwein rearranged products.

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The reaction of (‐)‐fenchone hydrazone with TeCl4 and DBU gave two isomers of Δ3‐1,3,4‐telluradiazoline (syn‐ and anti‐forms). Thermolysis of isolated anti‐Δ3‐1,3,4‐telluradiazoline gave chiral (E)‐1,1’,3,3,3’,3’‐hexamethyl‐2,2’‐binorbornylidene with perfect stereoselectivity in 93 % yield, which clearly showed that the reaction proceeded through a twofold extrusion process. On the other hand, thermolysis of an anti‐selenium derivative gave a mixture of E‐ and Z‐alkenes along with selenofenchone, suggesting that 1,3‐dipolar retrocyclization proceeded along with twofold extrusion.