Acknowledgement. We thank the National Institutes of Health (Grant GM-30390) for generous financial support. NSF Grant CHE 81-00240 supported the purchase ofthe 300-MHz NMR spectrometer. We thank Professor Tadahiro Kat0 for providing spectra of racemic desepoxyasperdiol. ... (dd, J = 8.7, 4.0 Hz, 1 H), 4.05 (AB q, J 13.2 Hz, 2 H), 2.38-1.80 ... Studies on the Synthesis of Vitamin BI2. 4 ... Robert V. Stevens,+ Normand Beaulieu, Wing Hong ...
