Binuclear tin and germanium calix[4]arenes

Abstract

Ditin(II) and digermanium(II) calix[4]arenes, [Bu^tcalix]M₂ (1, M = Sn; 2, M = Ge) have been prepared by treatment of [Bu^tcalix]H₄ with M(NR₂) (R = Me or Me₃Si); the reaction of [Bu^tcalix]Li₄ with SnCl₄ affords the mixed valence ditin derivative [Bu^tcalix]Sn₂Cl₂ 3.