β Scribed by Steven J. Gould; Chris R. Melville
No coin nor oath required. For personal study only.
Kinobscurinone, a benzo[b]
fluorenone quinone previously reported to be "NMR silent," affarding neither 1H-nor 13C NMR spectra under a variety of conditions, has now been shown to exist in part as a free radical under ambient conditions. The g value for kinobscurinone was found to be 2.0052; no hyperfine splitting was observed. ESR signals were similarly observed for three other substituted benzo[b]fluorene quinones.
π SIMILAR VOLUMES
## Abstract The ^13^C NMR spectra of the antileukemic ansa macrolide maytansine and eight naturally occurring homologues were recorded. Signals were assigned to specific carbon atoms of the ansa macrolide ring and Cβ3 ester side chain using data from offβresonance decoupling, single frequency decou
## Abstract A total carbon shift analysis of several representatives of the labdane diterpene family of natural products is presented. The shift assignment is based on the prior shift designation of some synthetic transβdecalin derivatives.