Oxidative transformations of cembrane diterpenoids III. Epoxycembrenes
Summary1. It has been established that the epoxidation of cembrene with perbenzoic and peracetic acids takes place stereospecifically at each of the trisubstituted double bonds with the formation of 4S,5R-, 7S,8S-, and 11S,12S-monoepoxycembrenes, the structures and absolute configurations of which have been established by spectral methods.2. Epoxidation of cembrene at the C11–C12 double bonds under the conditions used takes place preferentially as compared with epoxidation at the C7–C8 double bond.
Marine natural products: nephthenol and epoxynephthenol acetate, cembrene derivatives from a soft coral
Two new cembrene derivatives (1) and (5) have been isolated from a Pacific soft coral and their structures have been established by spectroscpic analyses and chemical degradations.
The Need For A Sacred Science
The meaning of a science rooted in the sacred, its contrast to modern science and its pertinence to us today.