Received NovernbeT 9, 1966 l, lO-Dimethyl-l (9)-octalin (4), prepared from 1, 10-dimethyl-1 (9)-octal-2-one via the alcohol 2 and acetate 3, was subjected to chemically and photochemically excited oxygen. The principal product, l-methylenetrans-10-methyl-9- decalyl hydroperoxide (S), was characterized through its hydrogenation product, cis-1, lO- dimethyl-trans-9-decalol (13), independently synthesized from lO-rnethyl-tTans-l (9)- ...