** {#sec0.00} --------------------------------  A 000 mg portion (0.00 mmol) of **0a** was dissolved in 00 mL of DME and cooled to −00 °C, and 000 mg (0.00 mmol) of KO*t*Bu was added. After it was stirred for an additional 00 min, the mixture was warmed to room temperature and finally stirred for an additional 00 h. At this time, reaction control by ^00^Si NMR showed that the dianionic species **0a** was completely formed. Subsequently, the reaction mixture was cooled to −00 °C and 00 mg (0.00 mmol) of ClSiMe~0~ was added dropwise. The reaction mixture was warmed to room temperature and stirred for an additional 00 min. At this time, reaction control by NMR showed that 