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[en] The analogs of 29C-brassinosteroids based on stigmasterol, i.e., 22S,23S-homo-castasterone and 22S,23S-homobrassinolide, were synthesized. Electrophilic additions at the Δ22-bond, hydroxylation with osmium tetroxide, and epoxidation followed by conversion of the epoxide into the diol were used for the construction of the 22S,23S-diol grouping. The PMR spectra of 5% solutions in deuterochloroform were obtained on JNM-PS-100 and WM-360 instruments at 100 and 360 MHz respectively with TMS as internal standard
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