Photoinduced transformations. 76. A four-step substitution of a carbonyl group of steroidal ketones by an oxygen atom. A new method for the synthesis of cyclic ethers
Goswami, Papori; Hazarika, Saroj; Das, Archana M., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2004, vol. 43, # 6, p. 1275 - 1281