“…Enzymes, histidine in active centers, 35 EPR, organoiron cmpds, 137 Excimers, 25 Flavonoids, 63 Fluorinated antimetabolites, 70 Fluorine cmpds, 53, 68-74 as blood substitutes, 36 by selective fluorination, 70 Fluorocarbons, reacns with pos chlorine cmpds, 69 Fluoroxy cmpds, 71 Fluorosulfur(IV) and -(V) coordination cmpds, 68 Free radicals, see radicals Galactomannans, 19 Heavy-atom effects, photochemical, 7 Heteroallenes, O-, N-, S-subst, 49 Heterocycles, containing link P-N-N, 108 indazoles, 109 d-lactams, 117 macrocyclic pyrrole, [170][171] nitrogen containing, 98 piperidinones, 104 triazines, tetrazines, pentazines, 178 Histidine, in active centers, 35 Hydroaromatic cmpds, polycyclic, 43 Hydrogen abstraction, silanes, 83 unimolecular, 96 Hydrogen atom transfer, isotope effects, 162 Hydrogenation, catalytic, 174 Hydroxycinnamic and -benzoic acids in plants, 77 Hypohalite, oxidn with, 146 Imaging systems, 20 Imidates, photochemistry, 163 Imides, cyclic in heterochain polymers, 100 cyclic, photoreactions, 10 Indazoles, 109 Intermediates, detn by NMR, 2 reactive, [147][148][149][150][151][152][153][154] Iridium complexes, 4 Iron, organic cmpds of, [133][134][135][136][137][138]...…”