Tetrabutylammonium fluoride induces the decomposition of 1-tert-butyl-4, 4-dimethyl-5-(3- siloxyphenyl)-2, 6, 7-trioxabicyclo [3.2. 0] heptane (4a) in DMSO to form an oxyanion of aromatic ketone (14a) as an emitter with high singlet-chemiexcitation yield comparable with that for a chemically initiated electron exchange luminescence (CIEEL) active dioxetane producing an oxyanion of aromatic ester as an emitter. A 7-siloxynaphthalen-2-yl analog ( ...