Abstract Aldehydes, RCHO (R= Me, Et, i Pr, and cC 6 H 11), have been converted via alkylation, cyclopropanation, oxidation, condensation with p-tosylhydrazine, reduction and perhydrolysis into 2-hydroperoxyalkylcyclopropanes, RCH (OOH) CH 2 cC 3 H 5, and