Abstract
Conformational analyses based on 1H relaxation times (T1) and nuclear Overhauser effects (n.O.e.s) have been carried out for several hydrobenzo[c]phenanthridine alkaloids. Calculated and observed values of T1 and n.O.e.s have been compared for several possible conformations, and optimum conformations are proposed. These are in reasonable agreement with previous data with the exception of ring B and the N-methyl group. The correlation times for molecular motion have also been evaluated, and are discussed in connection with molecular structures and conformations.
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