Desilylation of 1, 1-bis (trimethylsilyl)-1-cyclopropa [] naphthalene 10 with-butoxide or hydroxide ion gives anion 9 as a highly reactive species. Formed with-butoxide 9 can be intercepted by iodomethane to give the 1-methyl-1-trimethylsilyl derivative 13. With hydroxide ion and water catalytic didesilylation regene