Six-membered cyclic amidines effectively catalyzed the reaction of carbon disulfide with epoxides under mild conditions, such as atmospheric pressure and ambient temperature, to give the corresponding cyclic dithiocarbonates (1,3-oxathiolane-2-thiones) in high yields.

中文翻译：

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六元环脒作为在温和条件下由二硫化碳和环氧化物合成环状二硫代碳酸酯的有效催化剂

六元环脒在温和条件下（如常压和室温）有效催化二硫化碳与环氧化物的反应，以高产率得到相应的环状二硫代碳酸酯（1,3-oxathiolane-2-thiones）。