2,4,4,6-Tetraaryl-4H-thiopyrans Ia - Ig react smoothly with carbon disulfide solution of chlorine already at 0 °C yielding the corresponding 3,5-dichloro derivatives IIa - IIg. With longer reaction time and temperature raised to 20 °C, the 4H-thiopyrans Ia - Ie gave exclusively the trichloro derivatives IIIa - IIIe whereas If and Ig underwent a nonselective chlorination leading to multicomponent mixtures of products. Isolation of sulfoxides IVa and IVe from the chlorination of Ia and Ie (upon hydrolysis of the reaction mixture) allowed us to formulate the reaction mechanism for the formation of compounds type III. 1H, 13C NMR, and mass spectra of the prepared compounds are discussed in detail.
2,4,4,6-四芳基-4H-硫代吡喃Ia - Ig在0°C时与二硫化碳溶液中的氯反应顺利,生成相应的3,5-二氯衍生物IIa - IIg。随着反应时间的延长和温度升至20°C,4H-硫代吡喃Ia - Ie仅产生三氯衍生物IIIa - IIIe,而If和Ig经历非选择性氯化,导致多组分混合物的产生。从Ia和Ie的氯化反应(在反应混合物水解后)中分离出IVa和IVe的亚砜,使我们能够为III型化合物的形成提出反应机理。详细讨论了所制备化合物的1H、13C核磁共振和质谱。