Reaction of an enolisable diazo-compound with the electron-rich stannylene Sn[N(SiMe3)2]2: preparation of a novel spiro[1,3,4,2-oxadiazastannine-6,4′-pyrazole] derivative

Abstract

The reaction of the enolisable diazo-compound MeCOC(N₂)CO(OEt) with the electron-rich stannylene Sn[N(SiMe₃)₂]₂ yields a 2 : 1 adduct {in contrast to its reaction with the analogous germylene Ge[N(SiMe₃)₂]₂, which gives a 1 : 1 adduct}, shown spectroscopically to be diethyl 3′-acetyl-2,2-di[bis(trimethylsilyl)amino]-3,6,3′,5′-tetrahydrospiro[1,3,4,2-oxadiazastannine-6,4′-pyrazole]-5,3′-dicarboxylate.