The IR spectra are characterized by the following absorption bands (Vmax, cm-1): 1710 (C= O fluorenone), 1740 (C= O esters), 1020-1030 and 1210-1220 (ether bond), 2830 (CH in the- CH2-<)-R group), 2900-2940 (asymm.), 2840-2860 (symm.)(aliphatic CH bond), and 750 (CH bond of the polymethylene chain). o R= H (Ia----VII~, Br (Ilbp, C|(IIc--IVe),