Буду признателен за помощь, нужна статья:
V. I. Saloutin, Z. E. Skryabina, I. T. Bazyl', S. P. Kisil', Interaction of 3-ethoxycarbonyl(carboxy)-substituted 5,6,7,8-tetrafluorochromones with N-nucleophiles: synthesis of fluorocoumarins, Journal of Fluorine Chemistry, Volume 94, Issue 1, 11 February 1999, Pages 83-90.
- DOI:
http://dx.doi.org/10.1016/S0022-1139(98)00350-9
