Conformational analysis in multisulfur heterocycles. II. Isolation of the

chemical shift assignments for multi-conformation systems: A platinum(II) complex. Linda A. Luck , Wendy L. Elesser , John L. Hubbard , C. Hackett...
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Figure 2. Low-temperature infrared spectrum of the carbonyl region after 50-min irradiation' of l-methoxybicyclo[3.2.O]hepta3,6-dien-2-one (111).

ketene carbonyl band at 2118 cm-' (Figure 2)51* which could be observed after 2-min irradiation and which reached a maximum at 1-3 hr. The intermediate was stable in the dark for 12 hr at