S B Kalidhar
Articles written in Journal of Chemical Sciences
Volume 102 Issue 6 December 1990 pp 737-740 Organic
A comparison of1H NMR spectra of acetoxycoumarin and alkoxycoumarin shows that an aromatic proton para to the site of difference undergoes a larger change in chemical shift. In absence of a para proton,-ortho protons undergo this change. These help in locating alkoxylation sites in naturally occurring coumarins.
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