Comparison of the n.m.r. spectra of NN′-diacetylputrescine (6), NNN′N′-tetra-acetylputrescine (7), OO′-diacetylcaffeic acid (5), and the title compound indicate the last to have structure (4). Preparation conditions and stabilities support this conclusion.
R. Davies and E. I. Mbadiwe, J. Chem. Soc., Perkin Trans. 2, 1976, 616 DOI: 10.1039/P29760000616
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