** {#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 an excess of MeI was added dropwise. The red solution immediately turned yellow. After aqueous workup with 00 mL of 0% sulfuric acid, the organic layer was separated and dried over Na~0~SO~0~ and the solvent was stripped off with a rotary evaporator. Drying under vacuum afforded 000 mg (00%) of the analytically pure cyclic acylsilane **0