Journal
TETRAHEDRON
Volume 63, Issue 44, Pages 10826-10833Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2007.06.127
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A series of germanium and tin complexes of calix[4]arene diethers, namely [Calix(t-BU)(O)(2)(OR)(2)]M, has been prepared by the reaction of [Calix(t-Bu)(OH)(2)(OR)(2)] with M[N(SiMe3)(2)](2) (M = Ge, Sn; R = Me, CH2Ph, CH2C6H4But, SiPr3i). X-ray diffraction studies demonstrate that [Calix(t-Bu)(O)(2)(OR)(2)]M exist as exo and endo isomers in which the metal is, respectively, located either outside or inside the calixarene cavity. The exo isomer is considered to be the kinetic product, whereas the endo isomer is thermodynamically more stable. The ability to access endo-[Calix(t-BU)(O)(2)(OR)(2)]M, however, depends critically on the nature of R and M. (C) 2007 Elsevier Ltd. All rights reserved.
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