The nuclear magnetic resonance spectra of twenty two morphine type derivatives were measured and their characteristic signals of the aromatic protons, N-methyl, acetoxylmethyl, the ethylenic protons in ring C, the protons alpha to hydroxyl, acetoxyl and C
4-C
5 ether bridge, and those of C
9α, C
10β, and C
14β were assigned. The observed values of J
5β, 6α or J
5β, 6β and the chemical shifts of C
6-acetoxylmethyl yielded information about the ring C conformation.
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