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The IR characterization of tropothione (1), the sulfur analogue of tropone (2), is described together with an argument for vibrational assignments for ν(C=C) and ν(C=O) in 2. The IR spectrum of 1 is measured in five different solvents as well as in the neat state for assignments. The titled compound 1 exhibits a very strong band of the thiocarbonyl stretching vibration (ν C=S )...
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