1,1,3,3-Tetramethyl-4,5-Bis(trimethylsilyl)-1,3-Disilacyclopent-4-Ene. Preparation by the First Methylene Insertion Reaction Into a Silicon–silicon Bond and Anion Radicals1)

The title compound was prepared by the reaction of 1,1,2,2-tetramethyl-3,4-bis(trimethylsilyl)-1,2-disilacyclobutene with photochemically generated methylene. Anion radicals of the title compound showed temperature dependence due to ring flipping.