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Photolysates were concentrated on a rotary evaporator and the residues chromatographed (Silica Gel, 2.5 X 40 cm) and eluted with 0-30% benzene in hexane. Eluted fractions were analyzed by GLPC.Quantum Yields. Potassium ferrioxalate and the procedure described by Calvert and Pitts were used.32 The light source was a 200-W Hg-Xe lamp, and the 405-nm line was isolated by a Jarrell-Ash monochromator.The light intensity was determined twice before and once after the actual photolysis. No change in light intensity was detected during these experiments. The photolysis of 1 and DCA were carried out to ~10% conversion of 1. The photolysate was analyzed by GLPC using an internal standard and determination of GLPC response factors. The quantum yields were determined three times. The photooxygenation of 1 was used as an actinometer for the measurements of the quantum yields for the photooxygenation of 12, 14, and 18, which were irradiated on the merry-go-round.