Photolysis of 4, 4-dimethylandrost-5-en-17 beta-ol-3-one. The photolysis of pregnenolone acetate anti-oxime.

The basic tenet of photochemistry may be summarized by the statement that an electronically excited molecule represents a new chemical species with its own structure and reactivity. Though lightinduced transformations in cyclic ketones have been known almost sixty years, work in this field has lagged. [...