New effective methods were developed for the preparation of useful electrophilic trifluoromethylating agents, S-(trifluoromethyl)dibenzothiophenium tetrafluoroborate (3) and triflate (4) and S-(trifluoromethyl)dibenzothiophenium-3-sulfonate (6). Thus, salts 3 and 4 were produced by the intramolecular cyclization of sulfoxide 1 with fuming sulfuric acid, followed by the counteranion replacement reaction of the intermediate (2) with sodium tetrafluoroborate and triflate, and salt 6 was directly produced from 1 by treatment with excess fuming sulfuric acid. Useful preparative methods for 1 were also described.

中文翻译：

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制备S-（三氟甲基）二苯并噻吩鎓盐的有效方法

开发了用于制备有用的亲电三氟甲基化剂，S-（三氟甲基）二苯并噻吩四氟硼酸酯（3）和三氟甲磺酸酯（4）和S-（三氟甲基）二苯并噻吩-3-磺酸盐（6）的新的有效方法。因此，盐3和4是由亚砜的分子内环化产生1与发烟硫酸，随后中间物（的抗衡阴离子置换反应2）与四氟硼酸盐和三氟甲磺酸酯钠和盐6是直接从生产1用过量的发烟硫酸处理。还介绍了1的有用制备方法。