... set of signals for the protons of ortho-acylated phenol ring and two doublets ( 4 J HH =0.9 ... Microanalyses were performed in the Microanalytical Laboratory of the Institute of Organic Chemistry, National Academy of Sciences of ... 2g, 12 and 12a 2i and 5i, 12b 2m–o, 12c 5a,b,e, ...